Updated to 6.41.0

Fix DeluxeCombat and FabledSkyBlock integration

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Auxilor Community Discord
+    url: https://discord.gg/ZcwpSsE/
+    about: Join the Auxilor discord to get help from support staff and the general community!
+  - name: The most common issues people have
+    url: https://github.com/Auxilor/eco/issues/78
+    about: Check the list of known common issues to see if your issue has already been solved

.github/ISSUE_TEMPLATE/report-a-bug.md

@@ -0,0 +1,31 @@
+---
+name: Report a Bug
+about: Report an issue with the plugin
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior: 
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Server Information (please complete the following information):**
+- Version: (output of `/ver` command)
+- Version of plugin and eco (`/ver eco`, `/ver <plugin>`)
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/request-a-feature.md

@@ -0,0 +1,20 @@
+---
+name: Request a Feature
+about: Suggest an idea for this plugin
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "gradle" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "daily"

.github/workflows/checkstyle.yml

@@ -0,0 +1,15 @@
+name: Check PR Codestyle
+on: [ pull_request ]
+
+jobs:
+  checkstyle:
+    name: Checkstyle
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dbelyaev/action-checkstyle@v0.5.1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-review
+          level: warning
+          checkstyle_config: ../../config/checkstyle/checkstyle.xml

.github/workflows/java-ci.yml

@@ -0,0 +1,36 @@
+name: Java CI
+
+on: [ push, pull_request ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout latest code
+        uses: actions/checkout@v2
+
+      - name: Set outputs
+        id: vars
+        run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'temurin'
+          java-version: 17
+
+      - name: Setup build cache
+        uses: actions/cache@v2.1.6
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - run: ./gradlew build --full-stacktrace
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: eco-dev-${{ steps.vars.outputs.sha_short }}
+          path: build/libs

.github/workflows/publish-release.yml

@@ -0,0 +1,38 @@
+name: Publish release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish-release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout latest code
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'temurin'
+          java-version: 17
+
+      - name: Setup build cache
+        uses: actions/cache@v2.1.6
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: Publish artifact
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+        # The GITHUB_REF tag comes in the format 'refs/tags/xxx'.
+        # So if we split on '/' and take the 3rd value, we can get the release name.
+        run: |
+          NEW_VERSION=$(echo "${GITHUB_REF}" | cut -d "/" -f3)
+          echo "New version: ${NEW_VERSION}"
+          echo "Github username: ${GITHUB_ACTOR}"
+          ./gradlew -Pversion=${NEW_VERSION} publish

.github/workflows/test-publish.yml

@@ -0,0 +1,42 @@
+name: Publish API (Dev)
+
+on: [ push, pull_request ]
+
+jobs:
+  publish-release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout latest code
+        uses: actions/checkout@v2
+
+      - name: Set outputs
+        id: vars
+        run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'temurin'
+          java-version: 17
+
+      - name: Setup build cache
+        uses: actions/cache@v2.1.6
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+
+      - name: Publish artifact
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+        # The GITHUB_REF tag comes in the format 'refs/tags/xxx'.
+        # So if we split on '/' and take the 3rd value, we can get the release name.
+        run: |
+          NEW_VERSION=$(echo "${GITHUB_REF}" | cut -d "/" -f3)
+          echo "New version: ${{ steps.vars.outputs.sha_short }}"
+          echo "Github username: ${GITHUB_ACTOR}"
+          ./gradlew -Pversion=dev-${{ steps.vars.outputs.sha_short }} publish

.gitignore

@@ -14,7 +14,8 @@ bin/
 # Gradle
 .gradle
 **/build/
-!src/**/build/
+**/out/
+!eco-api/src/**/build/
 .gradletasknamecache
 !gradle-wrapper.jar
 gradle-app.setting

CONTRIBUTING.md

@@ -1,27 +1,38 @@
 # How to contribute to eco
 
 ## Codestyle
+
 1. The eco checkstyle is in /config/checkstyle.xml
+
 - The pull request must not have any checkstyle issues.
 - Every method and field must have a javadoc attached.
 
-2. Use lombok wherever possible.
-- @Getter, @Setter, @ToString, @EqualsAndHashCode, @UtilityClass are the most important.
+2. Use JetBrains annotations
 
-3. Use JetBrains annotations
 - Every parameter should be annotated with @NotNull or @Nullable
-- Use @NotNull over lombok @NonNull
 
-4. Imports
+3. Imports
+
 - No group (*) imports.
 - No static imports.
 
+4. Kotlin
+
+- Kotlin should be the only language used in the backend, java should be the only language used in the frontend.
+- Kotlin API extensions should only be for creating extension functions and extra niceties that aren't possible in java.
+  Do not write API components in kotlin.
+- Kotlin code should never be called directly from the frontend Java API. Kotlin API extensions should always rely on
+  java, not the other way round.
+
 ## Dependency Injection
+
 - eco uses Dependency Injection
-- Any calls to AbstractEcoPlugin#getInstance are code smells and should never be used unless **absolutely necessary**.
+- Any calls to Eco#getHandler#getEcoPlugin are code smells and should never be used unless **absolutely necessary**.
 - NamespacedKeys, FixedMetadataValues, Runnables, and Schedules should be managed using AbstractEcoPlugin through DI.
-- Any DI class should extend PluginDependent where possible. If the class extends another, then you **must** store the plugin instance in a private final variable called **plugin** with a private or protected getter.
+- Any DI class should extend PluginDependent where possible. If the class extends another, then you **must** store the
+  plugin instance in a private final variable called **plugin** with a private or protected getter.
 
 ## Other
+
 - All drops **must** be sent through a DropQueue - calls to World#dropItem will get your PR rejected.
-- eco is built with java 8. Usage of J9+ will get your PR rejected.
+- eco is built with java 17.

README.md

@@ -1 +1,121 @@
-## eco - Library for spigot plugin development.
+# eco
+eco is a powerful Spigot development library that simplifies the process of plugin creation and supercharges
+your plugins.
+It's the engine behind [EcoEnchants](https://polymart.org/resource/490), [Reforges](https://polymart.org/resource/1330),
+[EcoItems](https://polymart.org/resource/1247), [EcoSkills](https://polymart.org/resource/1351),
+[EcoArmor](https://polymart.org/resource/687), [Talismans](https://polymart.org/resource/611),
+and many more.
+
+<p>
+    <a href="https://github.com/Auxilor/eco/releases">
+        <img alt="spigot" src="https://img.shields.io/github/v/release/Auxilor/eco?color=informational"/>
+    </a>
+    <a href="https://bstats.org/plugin/bukkit/EcoEnchants" alt="bstats servers">
+        <img src="https://img.shields.io/bstats/servers/7666?color=informational"/>
+    </a>
+    <a href="https://bstats.org/plugin/bukkit/EcoEnchants" alt="bstats players">
+        <img src="https://img.shields.io/bstats/players/7666?color=informational"/>
+    </a>
+    <a href="https://plugins.auxilor.io/" alt="Docs (gitbook)">
+        <img src="https://img.shields.io/badge/docs-gitbook-informational"/>
+    </a>
+    <a href="https://discord.gg/ZcwpSsE/" alt="Discord">
+        <img src="https://img.shields.io/discord/452518336627081236?label=discord&color=informational"/>
+    </a>
+    <a href="https://github.com/Auxilor/eco/actions/workflows/java-ci.yml" alt="Latest Dev Build">
+        <img src="https://img.shields.io/github/workflow/status/Auxilor/eco/Java%20CI/develop?color=informational"/>
+    </a>
+</p>
+
+# For server owners
+- Requires ProtocolLib to be installed: get the latest version [here](https://www.spigotmc.org/resources/protocollib.1997/)
+- Supports 1.17+
+
+## Downloads
+
+- Stable (Recommended): [GitHub](https://github.com/Auxilor/eco/releases), [Polymart](https://polymart.org/resource/eco.773)
+- Dev (Not Recommended): [GitHub](https://github.com/Auxilor/eco/actions/workflows/java-ci.yml) (Open latest run and download)
+
+# For developers
+
+## Javadoc
+The 6.38.2 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.38.2/javadoc/)
+
+## Plugin Information
+
+eco is a standalone plugin, so you will need to install it on any servers that have plugins which depend on it,
+and specify it as a dependency in your plugin.yml:
+
+```yaml
+depend:
+  - eco
+```
+
+## Get from JitPack:
+
+Gradle:
+
+```groovy
+repositories {
+        maven { url 'https://jitpack.io' }
+}
+
+```
+
+```groovy
+dependencies {
+        compileOnly 'com.willfp:eco:Tag'
+}
+```
+
+Replace `Tag` with a release tag for eco, eg `6.27.2`.
+
+Maven:
+
+```xml
+<repository>
+        <id>jitpack.io</id>
+        <url>https://jitpack.io</url>
+</repository>
+```
+
+```xml
+<dependency>
+        <groupId>com.willfp</groupId>
+        <artifactId>eco</artifactId>
+        <version>Tag</version>
+        <scope>provided</scope>
+</dependency>
+```
+
+Replace `Tag` with a release tag for eco, eg `6.27.2`.
+
+## Build locally:
+
+Run the following commands in your terminal of choice.
+
+If you're on windows, you will need to have git bash installed.
+```
+git clone https://github.com/Auxilor/eco
+cd eco
+./gradlew build
+```
+
+## License
+
+*Click here to read [the entire license](https://github.com/Auxilor/eco/blob/master/LICENSE.md).*
+
+<h1 align="center">
+  Check out our partners!
+  <br>
+  <div style="width: 50%; margin: 0 auto;">
+  <br>
+    <a href="https://gamersupps.gg/discount/Auxilor?afmc=Auxilor" target="_blank">
+      <img src="https://i.imgur.com/7mFhlQO.png" alt="supps banner">
+    </a>
+    <a href="https://dedimc.promo/Auxilor" target="_blank">
+      <img src="https://i.imgur.com/x9aeH38.png" alt="dedimc banner">
+    </a>
+  <br>
+  </div>
+</h1>

build.gradle

@@ -1,102 +0,0 @@
-plugins {
-    id 'java-library'
-    id 'com.github.johnrengelman.shadow' version '5.2.0'
-    id 'maven-publish'
-    id 'java'
-}
-
-dependencies {
-    implementation 'org.apache.maven:maven-artifact:3.0.3'
-    implementation 'org.bstats:bstats-bukkit:1.7'
-    compileOnly 'org.spigotmc:spigot-api:1.16.4-R0.1-SNAPSHOT'
-    compileOnly 'me.clip:placeholderapi:2.10.9'
-    compileOnly 'com.comphenix.protocol:ProtocolLib:4.6.0-SNAPSHOT'
-    compileOnly 'com.sk89q.worldguard:worldguard-bukkit:7.0.4-SNAPSHOT'
-    compileOnly 'com.github.TechFortress:GriefPrevention:16.14.0'
-    compileOnly 'com.massivecraft:Factions:1.6.9.5-U0.5.10'
-    compileOnly 'com.github.cryptomorin:kingdoms:1.10.3.1'
-    compileOnly 'com.github.TownyAdvanced:Towny:0.96.2.0'
-    compileOnly 'com.github.angeschossen:LandsAPI:4.7.3'
-    compileOnly 'fr.neatmonster:nocheatplus:3.16.1-SNAPSHOT'
-    compileOnly 'com.github.jiangdashao:matrix-api-repo:317d4635fd'
-    compileOnly 'org.jetbrains:annotations:19.0.0'
-    compileOnly fileTree(dir: '/lib', include: ['*.jar'])
-
-    // Lombok
-    compileOnly 'org.projectlombok:lombok:1.18.16'
-    annotationProcessor 'org.projectlombok:lombok:1.18.16'
-    testCompileOnly 'org.projectlombok:lombok:1.18.16'
-    testAnnotationProcessor 'org.projectlombok:lombok:1.18.16'
-}
-
-
-repositories {
-    mavenCentral()
-    jcenter()
-    mavenLocal()
-    maven { url 'https://jitpack.io' }
-
-    // NMS (for jitpack compilation)
-    maven { url 'https://repo.codemc.org/repository/nms/' }
-
-    // bStats
-    maven { url 'https://repo.codemc.org/repository/maven-public' }
-
-    // Spigot API
-    maven { url 'https://hub.spigotmc.org/nexus/content/repositories/snapshots/' }
-
-    // PlaceholderAPI
-    maven { url 'https://repo.extendedclip.com/content/repositories/placeholderapi/' }
-
-    // ProtocolLib
-    maven { url 'https://repo.dmulloy2.net/nexus/repository/public/' }
-
-    // WorldGuard
-    maven { url 'https://maven.enginehub.org/repo/' }
-
-    // FactionsUUID
-    maven { url 'https://ci.ender.zone/plugin/repository/everything/' }
-
-    // NoCheatPlus
-    maven { url 'https://repo.md-5.net/content/repositories/snapshots/' }
-}
-
-tasks.withType(JavaCompile) {
-    options.deprecation = true
-    options.encoding = 'UTF-8'
-}
-
-configurations.all {
-    exclude group: "org.codehaus.plexus", module: "plexus-utils"
-    exclude group: "com.mojang", module: "brigadier"
-    exclude group: "org.kitteh", module: "paste-gg-api"
-    exclude group: "org.spongepowered", module: "configurate-hocon"
-    exclude group: "com.darkblade12", module: "particleeffect"
-}
-
-shadowJar {
-    relocate('org.bstats.bukkit', 'com.willfp.eco.util.shaded.bstats')
-    relocate('org.apache.maven', 'com.willfp.eco.util.shaded.maven')
-}
-
-publishing {
-    publications {
-        shadow(MavenPublication) {
-            from components.java
-            artifact shadowJar
-        }
-    }
-}
-
-compileJava.options.encoding = 'UTF-8'
-compileJava.dependsOn clean
-
-publishToMavenLocal.dependsOn shadowJar
-
-build.dependsOn shadowJar
-build.dependsOn publishToMavenLocal
-
-group = 'com.willfp'
-archivesBaseName = project.name
-version = '1.0.1'
-java.sourceCompatibility = JavaVersion.VERSION_1_8

build.gradle.kts

@@ -0,0 +1,198 @@
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10")
+    }
+}
+
+plugins {
+    id("java-library")
+    id("com.github.johnrengelman.shadow") version "7.1.2"
+    id("maven-publish")
+    id("java")
+    kotlin("jvm") version "1.7.10"
+}
+
+dependencies {
+    implementation(project(":eco-api"))
+    implementation(project(path = ":eco-core:core-plugin", configuration = "shadow"))
+    implementation(project(":eco-core:core-proxy"))
+    implementation(project(":eco-core:core-backend"))
+    implementation(project(path = ":eco-core:core-nms:v1_17_R1", configuration = "reobf"))
+    implementation(project(path = ":eco-core:core-nms:v1_18_R1", configuration = "reobf"))
+    implementation(project(path = ":eco-core:core-nms:v1_18_R2", configuration = "reobf"))
+    implementation(project(path = ":eco-core:core-nms:v1_19_R1", configuration = "reobf"))
+}
+
+allprojects {
+    apply(plugin = "java")
+    apply(plugin = "java-library")
+    apply(plugin = "maven-publish")
+    apply(plugin = "com.github.johnrengelman.shadow")
+    apply(plugin = "kotlin")
+
+    repositories {
+        mavenCentral()
+        mavenLocal()
+        maven("https://jitpack.io")
+
+        // CustomCrafting
+        maven("https://maven.wolfyscript.com/repository/public/")
+
+        // SuperiorSkyblock2
+        maven("https://repo.bg-software.com/repository/api/")
+
+        // mcMMO, BentoBox
+        maven("https://repo.codemc.io/repository/maven-public/")
+
+        // Spigot API, Bungee API
+        maven("https://hub.spigotmc.org/nexus/content/repositories/snapshots/")
+
+        // PlaceholderAPI
+        maven("https://repo.extendedclip.com/content/repositories/placeholderapi/")
+
+        // ProtocolLib
+        maven("https://repo.dmulloy2.net/nexus/repository/public/")
+
+        // WorldGuard
+        maven("https://maven.enginehub.org/repo/")
+
+        // FactionsUUID
+        //maven("https://ci.ender.zone/plugin/repository/everything/")
+
+        // NoCheatPlus
+        maven("https://repo.md-5.net/content/repositories/snapshots/")
+
+        // CombatLogX
+        maven("https://nexus.sirblobman.xyz/repository/public/")
+
+        // MythicMobs
+        maven("https://mvn.lumine.io/repository/maven-public/")
+
+        // Crunch
+        maven("https://redempt.dev")
+
+        // LibsDisguises
+        maven("https://repo.md-5.net/content/groups/public/")
+
+        // FabledSkyblock
+        maven("https://repo.songoda.com/repository/public/")
+    }
+
+    dependencies {
+        // Kotlin
+        implementation(kotlin("stdlib", version = "1.7.10"))
+        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.2")
+
+        // Included in spigot jar, no need to move to implementation
+        compileOnly("org.jetbrains:annotations:23.0.0")
+        compileOnly("com.google.guava:guava:31.1-jre")
+
+        // Test
+        testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
+        testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.2")
+
+        // Adventure
+        implementation("net.kyori:adventure-api:4.10.1")
+        implementation("net.kyori:adventure-text-serializer-gson:4.10.1") {
+            exclude("com.google.code.gson", "gson") // Prevent shading into the jar
+        }
+        implementation("net.kyori:adventure-text-serializer-legacy:4.10.1")
+
+        // Other
+        implementation("com.github.ben-manes.caffeine:caffeine:3.1.0")
+        implementation("org.apache.maven:maven-artifact:3.8.5")
+    }
+
+    tasks.withType<JavaCompile> {
+        options.encoding = "UTF-8"
+    }
+
+    configurations.all {
+        exclude(group = "org.codehaus.plexus", module = "plexus-utils")
+        exclude(group = "com.mojang", module = "brigadier")
+        exclude(group = "org.kitteh", module = "paste-gg-api")
+        exclude(group = "org.kitteh", module = "pastegg")
+        exclude(group = "org.spongepowered", module = "configurate-hocon")
+        exclude(group = "com.darkblade12", module = "particleeffect")
+        exclude(group = "com.github.cryptomorin", module = "XSeries")
+        exclude(group = "net.wesjd", module = "anvilgui")
+        exclude(group = "org.slf4j", module = "slf4j-api")
+    }
+
+    configurations.testImplementation {
+        setExtendsFrom(listOf(configurations.compileOnly.get(), configurations.implementation.get()))
+    }
+
+    tasks {
+        compileKotlin {
+            kotlinOptions {
+                jvmTarget = "17"
+            }
+        }
+
+        shadowJar {
+            relocate("org.bstats", "com.willfp.eco.libs.bstats")
+            relocate("redempt.crunch", "com.willfp.eco.libs.crunch")
+            relocate("org.apache.commons.lang3", "com.willfp.eco.libs.lang3")
+            relocate("org.apache.maven", "com.willfp.eco.libs.maven")
+            relocate("org.checkerframework", "com.willfp.eco.libs.checkerframework")
+            relocate("org.intellij", "com.willfp.eco.libs.intellij")
+            relocate("org.jetbrains.annotations", "com.willfp.eco.libs.jetbrains.annotations")
+            //relocate("org.jetbrains.exposed", "com.willfp.eco.libs.exposed")
+            relocate("org.objenesis", "com.willfp.eco.libs.objenesis")
+            relocate("org.reflections", "com.willfp.eco.libs.reflections")
+            relocate("javassist", "com.willfp.eco.libs.javassist")
+            relocate("javax.annotation", "com.willfp.eco.libs.annotation")
+            relocate("com.google.errorprone", "com.willfp.eco.libs.errorprone")
+            relocate("com.google.j2objc", "com.willfp.eco.libs.j2objc")
+            relocate("com.google.thirdparty", "com.willfp.eco.libs.google.thirdparty")
+            relocate("com.google.protobuf", "com.willfp.eco.libs.google.protobuf") // No I don't know either
+            relocate("google.protobuf", "com.willfp.eco.libs.protobuf") // Still don't know
+            relocate("com.zaxxer.hikari", "com.willfp.eco.libs.hikari")
+            //relocate("com.mysql", "com.willfp.eco.libs.mysql")
+            relocate("de.undercouch.bson4jackson", "com.willfp.eco.libs.bson4jackson")
+            relocate("com.fasterxml.jackson", "com.willfp.eco.libs.jackson")
+            relocate("com.mongodb", "com.willfp.eco.libs.mongodb")
+            relocate("org.bson", "com.willfp.eco.libs.bson")
+            relocate("org.litote", "com.willfp.eco.libs.litote")
+            relocate("org.reactivestreams", "com.willfp.eco.libs.reactivestreams")
+            relocate("reactor.", "com.willfp.eco.libs.reactor.") // Dot in name to be safe
+
+            /*
+            Kotlin and caffeine are not shaded so that they can be accessed directly by eco plugins.
+            Also, not relocating adventure, because it's a pain in the ass, and it doesn't *seem* to be causing loader constraint violations.
+             */
+        }
+
+        compileJava {
+            dependsOn(clean)
+            options.encoding = "UTF-8"
+        }
+
+        java {
+            sourceCompatibility = JavaVersion.VERSION_17
+            targetCompatibility = JavaVersion.VERSION_17
+            withSourcesJar()
+        }
+
+        test {
+            useJUnitPlatform()
+
+            // Show test results.
+            testLogging {
+                events("passed", "skipped", "failed")
+            }
+        }
+
+        build {
+            dependsOn(shadowJar)
+        }
+    }
+}
+
+group = "com.willfp"
+version = findProperty("version")!!

config/checkstyle/checkstyle.xml

@@ -32,10 +32,6 @@
 -->
 
 <module name="Checker">
-    <module name="SuppressionFilter">
-        <property name="file" value="config/checkstyle/suppression.xml"/>
-    </module>
-
     <!--
         If you set the basedir property below, then all reported file
         names will be relative to the specified directory. See
@@ -45,7 +41,7 @@
     -->
     <property name="severity" value="error"/>
 
-    <property name="fileExtensions" value="java, properties, xml"/>
+    <property name="fileExtensions" value="java, properties, xml, kt"/>
 
     <!-- Excludes all 'module-info.java' files              -->
     <!-- See https://checkstyle.org/config_filefilters.html -->
@@ -66,6 +62,7 @@
     <module name="FileLength"/>
     <module name="LineLength">
         <property name="fileExtensions" value="java"/>
+        <property name="fileExtensions" value="kt"/>
         <property name="max" value="200"/>
     </module>
 
@@ -115,7 +112,6 @@
         <!-- Checks for imports                              -->
         <!-- See https://checkstyle.org/config_imports.html -->
         <module name="AvoidStarImport"/>
-        <module name="IllegalImport"/> <!-- defaults to sun.* packages -->
         <module name="RedundantImport"/>
         <module name="UnusedImports">
             <property name="processJavadoc" value="true"/>

config/checkstyle/suppression.xml

@@ -1,16 +0,0 @@
-<?xml version="1.0"?>
-
-<!DOCTYPE suppressions PUBLIC
-        "-//Puppy Crawl//DTD Suppressions 1.1//EN"
-        "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
-
-<suppressions>
-    <!-- Modified version of library -->
-    <suppress files="ArmorEquipEvent.java" checks="JavadocVariable"/>
-    <suppress files="ArmorEquipEvent.java" checks="MissingJavadocMethod"/>
-    <suppress files="ArmorEquipEvent.java" checks="JavadocStyle"/>
-    <suppress files="ArmorListener.java" checks="JavadocVariable"/>
-    <suppress files="ArmorListener.java" checks="MissingJavadocMethod"/>
-    <suppress files="ArmorType.java" checks="JavadocVariable"/>
-    <suppress files="ArmorType.java" checks="MissingJavadocMethod"/>
-</suppressions>

eco-api/build.gradle

@@ -0,0 +1,38 @@
+dependencies {
+    // Adventure
+    compileOnly 'net.kyori:adventure-platform-bukkit:4.1.0'
+
+    // Other
+    compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
+    compileOnly 'com.comphenix.protocol:ProtocolLib:4.6.1-SNAPSHOT'
+    compileOnly 'com.google.code.gson:gson:2.8.8'
+}
+
+group 'com.willfp'
+version rootProject.version
+
+java {
+    withJavadocJar()
+}
+
+build.dependsOn publishToMavenLocal
+
+publishing {
+    publications {
+        shadow(MavenPublication) {
+            from components.java
+            artifactId 'eco'
+        }
+    }
+
+    repositories {
+        maven {
+            name = "GitHubPackages"
+            url = uri("https://maven.pkg.github.com/Auxilor/eco")
+            credentials {
+                username = System.getenv("GITHUB_ACTOR")
+                password = System.getenv("GITHUB_TOKEN")
+            }
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/AbstractPacketAdapter.java

@@ -1,4 +1,4 @@
-package com.willfp.eco.util.protocollib;
+package com.willfp.eco.core;
 
 import com.comphenix.protocol.PacketType;
 import com.comphenix.protocol.ProtocolLibrary;
@@ -6,12 +6,14 @@ import com.comphenix.protocol.events.ListenerPriority;
 import com.comphenix.protocol.events.PacketAdapter;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
-import com.willfp.eco.util.plugin.AbstractEcoPlugin;
-import lombok.Getter;
+import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.Collections;
 
+/**
+ * Wrapper class for ProtocolLib packets.
+ */
 public abstract class AbstractPacketAdapter extends PacketAdapter {
     /**
      * The packet type to listen for.
@@ -23,7 +25,6 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
      * <p>
      * Useful for monitor priority adapters that <b>must</b> be ran last.
      */
-    @Getter
     private final boolean postLoad;
 
     /**
@@ -34,7 +35,7 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
      * @param priority The priority at which the adapter should be ran on packet send/receive.
      * @param postLoad If the packet adapter should be registered after the server has loaded.
      */
-    protected AbstractPacketAdapter(@NotNull final AbstractEcoPlugin plugin,
+    protected AbstractPacketAdapter(@NotNull final EcoPlugin plugin,
                                     @NotNull final PacketType type,
                                     @NotNull final ListenerPriority priority,
                                     final boolean postLoad) {
@@ -50,7 +51,7 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
      * @param type     The {@link PacketType} to listen for.
      * @param postLoad If the packet adapter should be registered after the server has loaded.
      */
-    protected AbstractPacketAdapter(@NotNull final AbstractEcoPlugin plugin,
+    protected AbstractPacketAdapter(@NotNull final EcoPlugin plugin,
                                     @NotNull final PacketType type,
                                     final boolean postLoad) {
         this(plugin, type, ListenerPriority.NORMAL, postLoad);
@@ -60,8 +61,12 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
      * The code that should be executed once the packet has been received.
      *
      * @param packet The packet.
+     * @param player The player.
+     * @param event  The event.
      */
-    public void onReceive(@NotNull final PacketContainer packet) {
+    public void onReceive(@NotNull final PacketContainer packet,
+                          @NotNull final Player player,
+                          @NotNull final PacketEvent event) {
         // Empty rather than abstract as implementations don't need both
     }
 
@@ -69,8 +74,12 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
      * THe code that should be executed once the packet has been sent.
      *
      * @param packet The packet.
+     * @param player The player.
+     * @param event  The event.
      */
-    public void onSend(@NotNull final PacketContainer packet) {
+    public void onSend(@NotNull final PacketContainer packet,
+                       @NotNull final Player player,
+                       @NotNull final PacketEvent event) {
         // Empty rather than abstract as implementations don't need both
     }
 
@@ -89,7 +98,7 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
             return;
         }
 
-        onReceive(event.getPacket());
+        onReceive(event.getPacket(), event.getPlayer(), event);
     }
 
     /**
@@ -107,7 +116,12 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
             return;
         }
 
-        onSend(event.getPacket());
+        onSend(event.getPacket(), event.getPlayer(), event);
+    }
+
+    @Override
+    public final EcoPlugin getPlugin() {
+        return (EcoPlugin) super.getPlugin();
     }
 
     /**
@@ -118,4 +132,13 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
             ProtocolLibrary.getProtocolManager().addPacketListener(this);
         }
     }
+
+    /**
+     * Get if the packet adapter should be loaded last.
+     *
+     * @return If post load.
+     */
+    public boolean isPostLoad() {
+        return this.postLoad;
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/Eco.java

@@ -0,0 +1,82 @@
+package com.willfp.eco.core;
+
+import org.apache.commons.lang.Validate;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Holds the instance of the eco handler for bridging between the frontend
+ * and backend.
+ *
+ * @see Eco#getHandler()
+ * @see Handler
+ */
+@ApiStatus.Internal
+public final class Eco {
+    /**
+     * Instance of eco handler.
+     */
+    @ApiStatus.Internal
+    private static Handler handler;
+
+    /**
+     * Set the handler.
+     *
+     * @param handler The handler.
+     */
+    @ApiStatus.Internal
+    public static void setHandler(@NotNull final Handler handler) {
+        Validate.isTrue(Eco.handler == null, "Already initialized!");
+
+        Eco.handler = handler;
+    }
+
+    /**
+     * Get the instance of the eco handler; the bridge between the api frontend
+     * and the implementation backend.
+     * <p>
+     * <strong>Do not use the handler in your plugins!</strong> It can and will contain
+     * breaking changes between minor versions and even patches, and you will create
+     * compatibility issues by using the handler. All parts of the handler have been abstracted
+     * into logically named API components that you can use.
+     * <p>
+     * Prior to version 6.12.0, the handler was considered as an API component, but it has
+     * since been moved into an internal component, and in 6.17.0, the first breaking change
+     * was introduced to {@link com.willfp.eco.core.config.wrapper.ConfigFactory}. This means
+     * that any usages of the handler can now cause problems in your plugins.
+     *
+     * @return The handler.
+     */
+    @ApiStatus.Internal
+    public static Handler getHandler() {
+        return handler;
+    }
+
+    /**
+     * Eco Handler components are internals, so if a class is marked as a handler component,
+     * then it should be treated the same as if it was marked with {@link ApiStatus.Internal}.
+     * <p>
+     * If a class is marked with {@link HandlerComponent}, <strong>Do not reference it in
+     * your code!</strong> It can and will contain breaking changes between minor versions and
+     * even patches, and you will create compatibility issues by using them.
+     * <p>
+     * Handler components should also be marked with {@link ApiStatus.Internal} in order to
+     * cause compiler / IDE warnings.
+     */
+    @Documented
+    @Retention(RetentionPolicy.CLASS)
+    @Target({ElementType.TYPE})
+    public @interface HandlerComponent {
+
+    }
+
+    private Eco() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/EcoPlugin.java

@@ -0,0 +1,924 @@
+package com.willfp.eco.core;
+
+import com.willfp.eco.core.command.impl.PluginCommand;
+import com.willfp.eco.core.config.base.ConfigYml;
+import com.willfp.eco.core.config.base.LangYml;
+import com.willfp.eco.core.config.updating.ConfigHandler;
+import com.willfp.eco.core.display.Display;
+import com.willfp.eco.core.display.DisplayModule;
+import com.willfp.eco.core.events.EventManager;
+import com.willfp.eco.core.extensions.Extension;
+import com.willfp.eco.core.extensions.ExtensionLoader;
+import com.willfp.eco.core.factory.MetadataValueFactory;
+import com.willfp.eco.core.factory.NamespacedKeyFactory;
+import com.willfp.eco.core.factory.RunnableFactory;
+import com.willfp.eco.core.integrations.IntegrationLoader;
+import com.willfp.eco.core.integrations.placeholder.PlaceholderManager;
+import com.willfp.eco.core.proxy.ProxyFactory;
+import com.willfp.eco.core.scheduling.Scheduler;
+import com.willfp.eco.core.web.UpdateChecker;
+import org.apache.commons.lang.Validate;
+import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
+import org.bukkit.Bukkit;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.event.Listener;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import java.util.logging.Logger;
+import java.util.stream.Collectors;
+
+/**
+ * EcoPlugin is the base plugin class for eco-based plugins.
+ * <p>
+ * It functions as a replacement for {@link JavaPlugin}.
+ * <p>
+ * EcoPlugin is a lot more powerful than {@link JavaPlugin} and
+ * contains many methods to reduce boilerplate code and reduce
+ * plugin complexity.
+ * <p>
+ * It is recommended to view the source code for this class to
+ * gain a better understanding of how it works.
+ * <p>
+ * <b>IMPORTANT: When reloading a plugin, all runnables / tasks will
+ * be cancelled.</b>
+ */
+@SuppressWarnings("unused")
+public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
+    /**
+     * The polymart resource ID of the plugin.
+     */
+    private final int resourceId;
+
+    /**
+     * The bStats resource ID of the plugin.
+     */
+    private final int bStatsId;
+
+    /**
+     * The package where proxy implementations are.
+     */
+    private final String proxyPackage;
+
+    /**
+     * The color of the plugin, used in messages.
+     */
+    private final String color;
+
+    /**
+     * Loaded integrations.
+     */
+    private final Set<String> loadedIntegrations = new HashSet<>();
+
+    /**
+     * The internal plugin scheduler.
+     */
+    private final Scheduler scheduler;
+
+    /**
+     * The internal plugin Event Manager.
+     */
+    private final EventManager eventManager;
+
+    /**
+     * Config.yml.
+     */
+    private final ConfigYml configYml;
+
+    /**
+     * Lang.yml.
+     */
+    private final LangYml langYml;
+
+    /**
+     * The internal factory to produce {@link org.bukkit.NamespacedKey}s.
+     */
+    private final NamespacedKeyFactory namespacedKeyFactory;
+
+    /**
+     * The internal factory to produce {@link org.bukkit.metadata.FixedMetadataValue}s.
+     */
+    private final MetadataValueFactory metadataValueFactory;
+
+    /**
+     * The internal factory to produce {@link com.willfp.eco.core.scheduling.RunnableTask}s.
+     */
+    private final RunnableFactory runnableFactory;
+
+    /**
+     * The loader for all plugin extensions.
+     *
+     * @see com.willfp.eco.core.extensions.Extension
+     */
+    private final ExtensionLoader extensionLoader;
+
+    /**
+     * The handler class for updatable classes.
+     */
+    private final ConfigHandler configHandler;
+
+    /**
+     * The display module for the plugin.
+     */
+    private DisplayModule displayModule;
+
+    /**
+     * The logger for the plugin.
+     */
+    private final Logger logger;
+
+    /**
+     * If the server is running an outdated version of the plugin.
+     */
+    private boolean outdated = false;
+
+    /**
+     * If the plugin supports extensions.
+     */
+    private final boolean supportingExtensions;
+
+    /**
+     * The proxy factory.
+     */
+    @Nullable
+    private final ProxyFactory proxyFactory;
+
+    /**
+     * Create a new plugin.
+     * <p>
+     * Will read from eco.yml (like plugin.yml) to fetch values that would otherwise be passed
+     * into the constructor. If no eco.yml is present, the plugin will load without extension
+     * support, without proxy support, with no update-checker or bStats, and with the color white.
+     */
+    protected EcoPlugin() {
+        this((PluginProps) null);
+    }
+
+    /**
+     * Create a new plugin without proxy support, polymart, or bStats.
+     *
+     * @param color The color.
+     */
+    protected EcoPlugin(@NotNull final String color) {
+        this("", color);
+    }
+
+
+    /**
+     * Create a new plugin unlinked to polymart and bStats.
+     *
+     * @param proxyPackage The package where proxy implementations are stored.
+     * @param color        The color of the plugin (used in messages, using standard formatting)
+     */
+    protected EcoPlugin(@NotNull final String proxyPackage,
+                        @NotNull final String color) {
+        this(0, 0, proxyPackage, color);
+    }
+
+    /**
+     * Create a new plugin without proxy or extension support.
+     *
+     * @param resourceId The polymart resource ID for the plugin.
+     * @param bStatsId   The bStats resource ID for the plugin.
+     * @param color      The color of the plugin (used in messages, using standard formatting)
+     */
+    protected EcoPlugin(final int resourceId,
+                        final int bStatsId,
+                        @NotNull final String color) {
+        this(resourceId, bStatsId, "", color);
+    }
+
+    /**
+     * Create a new plugin without proxy support.
+     *
+     * @param resourceId           The polymart resource ID for the plugin.
+     * @param bStatsId             The bStats resource ID for the plugin.
+     * @param color                The color of the plugin (used in messages, using standard formatting)
+     * @param supportingExtensions If the plugin supports extensions.
+     */
+    protected EcoPlugin(final int resourceId,
+                        final int bStatsId,
+                        @NotNull final String color,
+                        final boolean supportingExtensions) {
+        this(resourceId, bStatsId, "", color, supportingExtensions);
+    }
+
+    /**
+     * Create a new plugin without extension support.
+     *
+     * @param resourceId   The polymart resource ID for the plugin.
+     * @param bStatsId     The bStats resource ID for the plugin.
+     * @param proxyPackage The package where proxy implementations are stored.
+     * @param color        The color of the plugin (used in messages, using standard formatting)
+     */
+    protected EcoPlugin(final int resourceId,
+                        final int bStatsId,
+                        @NotNull final String proxyPackage,
+                        @NotNull final String color) {
+        this(resourceId, bStatsId, proxyPackage, color, false);
+    }
+
+    /**
+     * Create a new plugin.
+     *
+     * @param resourceId           The polymart resource ID for the plugin.
+     * @param bStatsId             The bStats resource ID for the plugin.
+     * @param proxyPackage         The package where proxy implementations are stored.
+     * @param color                The color of the plugin (used in messages, using standard formatting)
+     * @param supportingExtensions If the plugin supports extensions.
+     */
+    protected EcoPlugin(final int resourceId,
+                        final int bStatsId,
+                        @NotNull final String proxyPackage,
+                        @NotNull final String color,
+                        final boolean supportingExtensions) {
+        this(
+                PluginProps.createSimple(
+                        resourceId,
+                        bStatsId,
+                        proxyPackage,
+                        color,
+                        supportingExtensions
+                )
+        );
+    }
+
+    /**
+     * Create a new plugin.
+     *
+     * @param pluginProps The props. If left null, it will read from eco.yml.
+     */
+    protected EcoPlugin(@Nullable final PluginProps pluginProps) {
+        /*
+        The handler must be initialized before any plugin's constructors
+        are called, as the constructors call Eco#getHandler().
+
+        To fix this, EcoSpigotPlugin an abstract class and the 'actual'
+        plugin class is EcoHandler - that way I can create the handler
+        before any plugins are loaded while still having a separation between
+        the plugin class and the handler class (for code clarity).
+
+        I don't really like the fact that the handler class *is* the
+        spigot plugin, but it is what it is.
+
+        There is probably a better way of doing it - maybe with
+        some sort of HandlerCreator interface in order to still have
+        a standalone handler class, but then there would be an interface
+        left in the API that doesn't really help anything.
+
+        The other alternative would be to use reflection to get a 'createHandler'
+        method that only exists in EcoSpigotPlugin - but that feels filthy,
+        and I'd rather only use reflection where necessary.
+        */
+
+        if (Eco.getHandler() == null && this instanceof Handler) {
+            /*
+            This code is only ever called by EcoSpigotPlugin (EcoHandler)
+            as it's the first plugin to load, and it is a handler.
+
+            Any other plugins will never call this code as the handler
+            will have already been initialized.
+             */
+
+            Eco.setHandler((Handler) this);
+        }
+
+        assert Eco.getHandler() != null;
+
+        PluginProps generatedProps = Eco.getHandler().getProps(pluginProps, this.getClass());
+        generatedProps.validate();
+        PluginProps props = this.mutateProps(generatedProps);
+        props.validate();
+
+        this.resourceId = props.getResourceId();
+        this.bStatsId = props.getBStatsId();
+        this.proxyPackage = props.getProxyPackage();
+        this.color = props.getColor();
+        this.supportingExtensions = props.isSupportingExtensions();
+
+        this.proxyFactory = this.proxyPackage.equalsIgnoreCase("") ? null : Eco.getHandler().createProxyFactory(this);
+        this.logger = Eco.getHandler().createLogger(this);
+
+        this.getLogger().info("Initializing " + this.getColor() + this.getName());
+
+        this.scheduler = Eco.getHandler().createScheduler(this);
+        this.eventManager = Eco.getHandler().createEventManager(this);
+        this.namespacedKeyFactory = Eco.getHandler().createNamespacedKeyFactory(this);
+        this.metadataValueFactory = Eco.getHandler().createMetadataValueFactory(this);
+        this.runnableFactory = Eco.getHandler().createRunnableFactory(this);
+        this.extensionLoader = Eco.getHandler().createExtensionLoader(this);
+        this.configHandler = Eco.getHandler().createConfigHandler(this);
+
+        this.langYml = this.createLangYml();
+        this.configYml = this.createConfigYml();
+
+        Eco.getHandler().addNewPlugin(this);
+
+        /*
+        The minimum eco version check was moved here because it's very common
+        to add a lot of code in the constructor of plugins; meaning that the plugin
+        can throw errors without it being obvious to the user that the reason is that
+        they have an outdated version of eco installed.
+         */
+
+        DefaultArtifactVersion runningVersion = new DefaultArtifactVersion(Eco.getHandler().getEcoPlugin().getDescription().getVersion());
+        DefaultArtifactVersion requiredVersion = new DefaultArtifactVersion(this.getMinimumEcoVersion());
+        if (!(runningVersion.compareTo(requiredVersion) > 0 || runningVersion.equals(requiredVersion))) {
+            this.getLogger().severe("You are running an outdated version of eco!");
+            this.getLogger().severe("You must be on at least" + this.getMinimumEcoVersion());
+            this.getLogger().severe("Download the newest version here:");
+            this.getLogger().severe("https://polymart.org/download/773/recent/JSpprMspkuyecf5y1wQ2Jn8OoLQSQ_IW");
+            Bukkit.getPluginManager().disablePlugin(this);
+        }
+    }
+
+    /**
+     * Default code to be executed on plugin enable.
+     */
+    @Override
+    public final void onEnable() {
+        super.onEnable();
+
+        this.getLogger().info("");
+        this.getLogger().info("Loading " + this.getColor() + this.getName());
+
+        if (this.getResourceId() != 0 && !Eco.getHandler().getEcoPlugin().getConfigYml().getBool("no-update-checker")) {
+            new UpdateChecker(this).getVersion(version -> {
+                DefaultArtifactVersion currentVersion = new DefaultArtifactVersion(this.getDescription().getVersion());
+                DefaultArtifactVersion mostRecentVersion = new DefaultArtifactVersion(version);
+                if (!(currentVersion.compareTo(mostRecentVersion) > 0 || currentVersion.equals(mostRecentVersion))) {
+                    this.outdated = true;
+                    this.getLogger().warning(this.getName() + " is out of date! (Version " + this.getDescription().getVersion() + ")");
+                    this.getLogger().warning("The newest version is " + version);
+                    this.getLogger().warning("Download the new version!");
+                }
+            });
+        }
+
+        if (this.getBStatsId() != 0) {
+            Eco.getHandler().registerBStats(this);
+        }
+
+        Set<String> enabledPlugins = Arrays.stream(Bukkit.getPluginManager().getPlugins())
+                .map(Plugin::getName)
+                .map(String::toLowerCase)
+                .collect(Collectors.toSet());
+
+        if (enabledPlugins.contains("PlaceholderAPI".toLowerCase())) {
+            this.loadedIntegrations.add("PlaceholderAPI");
+            PlaceholderManager.addIntegration(Eco.getHandler().createPAPIIntegration(this));
+        }
+
+        this.loadIntegrationLoaders().forEach(integrationLoader -> {
+            if (enabledPlugins.contains(integrationLoader.getPluginName().toLowerCase())) {
+                this.loadedIntegrations.add(integrationLoader.getPluginName());
+                integrationLoader.load();
+            }
+        });
+
+        this.getLogger().info("Loaded integrations: " + String.join(", ", this.getLoadedIntegrations()));
+
+        Prerequisite.update();
+
+        this.loadPacketAdapters().forEach(abstractPacketAdapter -> {
+            if (!abstractPacketAdapter.isPostLoad()) {
+                abstractPacketAdapter.register();
+            }
+        });
+
+        this.loadListeners().forEach(listener -> this.getEventManager().registerListener(listener));
+
+        this.loadPluginCommands().forEach(PluginCommand::register);
+
+        this.getScheduler().runLater(this::afterLoad, 1);
+
+        if (this.isSupportingExtensions()) {
+            this.getExtensionLoader().loadExtensions();
+
+            if (this.getExtensionLoader().getLoadedExtensions().isEmpty()) {
+                this.getLogger().info("&cNo extensions found");
+            } else {
+                this.getLogger().info("Extensions Loaded:");
+                this.getExtensionLoader().getLoadedExtensions().forEach(extension -> this.getLogger().info("- " + extension.getName() + " v" + extension.getVersion()));
+            }
+        }
+
+        this.handleEnable();
+
+        this.getLogger().info("");
+    }
+
+    /**
+     * Default code to be executed on plugin disable.
+     */
+    @Override
+    public final void onDisable() {
+        super.onDisable();
+
+        this.getEventManager().unregisterAllListeners();
+        this.getScheduler().cancelAll();
+
+        this.handleDisable();
+
+        if (this.isSupportingExtensions()) {
+            this.getExtensionLoader().unloadExtensions();
+        }
+
+        this.getLogger().info("Cleaning up...");
+        Eco.getHandler().getCleaner().clean(this);
+    }
+
+    /**
+     * Default code to be executed on plugin load.
+     */
+    @Override
+    public final void onLoad() {
+        super.onLoad();
+
+        this.handleLoad();
+    }
+
+    /**
+     * Default code to be executed after the server is up.
+     */
+    public final void afterLoad() {
+        this.displayModule = createDisplayModule();
+
+        if (this.getDisplayModule() != null) {
+            Display.registerDisplayModule(this.getDisplayModule());
+        }
+
+        this.loadPacketAdapters().forEach(abstractPacketAdapter -> {
+            if (abstractPacketAdapter.isPostLoad()) {
+                abstractPacketAdapter.register();
+            }
+        });
+
+        if (!Prerequisite.HAS_PAPER.isMet()) {
+            this.getLogger().severe("");
+            this.getLogger().severe("----------------------------");
+            this.getLogger().severe("");
+            this.getLogger().severe("You don't seem to be running paper!");
+            this.getLogger().severe("Paper is strongly recommended for all servers,");
+            this.getLogger().severe("and some things may not function properly without it");
+            this.getLogger().severe("Download Paper from &fhttps://papermc.io");
+            this.getLogger().severe("");
+            this.getLogger().severe("----------------------------");
+            this.getLogger().severe("");
+        }
+
+        this.handleAfterLoad();
+
+        this.reload();
+
+        for (Extension extension : this.getExtensionLoader().getLoadedExtensions()) {
+            extension.handleAfterLoad();
+        }
+
+        this.getLogger().info("Loaded " + this.color + this.getName());
+    }
+
+    /**
+     * Reload the plugin.
+     */
+    public final void reload() {
+        this.getConfigHandler().updateConfigs();
+
+        this.getScheduler().cancelAll();
+        this.getConfigHandler().callUpdate();
+        this.getConfigHandler().callUpdate(); // Call twice to fix issues
+
+        this.handleReload();
+
+        for (Extension extension : this.extensionLoader.getLoadedExtensions()) {
+            extension.handleReload();
+        }
+    }
+
+    /**
+     * Reload the plugin and return the time taken to reload.
+     *
+     * @return The time.
+     */
+    public final long reloadWithTime() {
+        long startTime = System.currentTimeMillis();
+
+        this.reload();
+
+        return System.currentTimeMillis() - startTime;
+    }
+
+    /**
+     * The plugin-specific code to be executed on enable.
+     * <p>
+     * Override when needed.
+     */
+    protected void handleEnable() {
+
+    }
+
+    /**
+     * The plugin-specific code to be executed on disable.
+     * <p>
+     * Override when needed.
+     */
+    protected void handleDisable() {
+
+    }
+
+    /**
+     * The plugin-specific code to be executed on load.
+     * <p>
+     * This is executed before enabling.
+     * <p>
+     * Override when needed.
+     */
+    protected void handleLoad() {
+
+    }
+
+    /**
+     * The plugin-specific code to be executed on reload.
+     * <p>
+     * Override when needed.
+     */
+    protected void handleReload() {
+
+    }
+
+    /**
+     * The plugin-specific code to be executed after the server is up.
+     * <p>
+     * Override when needed.
+     */
+    protected void handleAfterLoad() {
+
+    }
+
+    /**
+     * Mutate the plugin props.
+     * <p>
+     * Useful for eco-based plugin libraries to enforce certain properties, such as
+     * forcing extensions to be enabled.
+     * <p>
+     * Props are validated both before and after calling this method.
+     *
+     * @param props The props.
+     * @return The mutated props.
+     */
+    protected PluginProps mutateProps(@NotNull final PluginProps props) {
+        return props;
+    }
+
+    /**
+     * The plugin-specific integrations to be tested and loaded.
+     *
+     * @return A list of integrations.
+     */
+    protected List<IntegrationLoader> loadIntegrationLoaders() {
+        return new ArrayList<>();
+    }
+
+    /**
+     * The commands to be registered.
+     *
+     * @return A list of commands.
+     */
+    protected List<PluginCommand> loadPluginCommands() {
+        return new ArrayList<>();
+    }
+
+    /**
+     * ProtocolLib packet adapters to be registered.
+     * <p>
+     * If the plugin does not require ProtocolLib this can be left empty.
+     *
+     * @return A list of packet adapters.
+     */
+    protected List<AbstractPacketAdapter> loadPacketAdapters() {
+        return new ArrayList<>();
+    }
+
+    /**
+     * All listeners to be registered.
+     *
+     * @return A list of all listeners.
+     */
+    protected abstract List<Listener> loadListeners();
+
+    /**
+     * Useful for custom LangYml implementations.
+     * <p>
+     * Override if needed.
+     *
+     * @return lang.yml.
+     */
+    protected LangYml createLangYml() {
+        return new LangYml(this);
+    }
+
+    /**
+     * Useful for custom ConfigYml implementations.
+     * <p>
+     * Override if needed.
+     *
+     * @return config.yml.
+     */
+    protected ConfigYml createConfigYml() {
+        return new ConfigYml(this);
+    }
+
+    /**
+     * Create the display module for the plugin.
+     *
+     * @return The display module, or null.
+     */
+    @Nullable
+    protected DisplayModule createDisplayModule() {
+        Validate.isTrue(
+                this.getDisplayModule() == null,
+                "Display module exists!"
+        );
+
+        return null;
+    }
+
+    /**
+     * Get the minimum version of eco to use the plugin.
+     *
+     * @return The version.
+     */
+    public String getMinimumEcoVersion() {
+        return "6.0.0";
+    }
+
+    /**
+     * Get the plugin's logger.
+     *
+     * @return The logger.
+     */
+    @NotNull
+    @Override
+    public Logger getLogger() {
+        return logger;
+    }
+
+    /**
+     * Get a proxy.
+     *
+     * @param proxyClass The proxy class.
+     * @param <T>        The proxy type.
+     * @return The proxy.
+     */
+    public final <T> T getProxy(@NotNull final Class<T> proxyClass) {
+        Validate.notNull(proxyFactory, "Plugin does not support proxies!");
+
+        return proxyFactory.getProxy(proxyClass);
+    }
+
+    /**
+     * Get unwrapped config.
+     * Does not use eco config system, don't use.
+     *
+     * @return The bukkit config.
+     * @deprecated Use getConfigYml() instead.
+     */
+    @NotNull
+    @Override
+    @Deprecated
+    public final FileConfiguration getConfig() {
+        this.getLogger().warning("Call to default config method in eco plugin!");
+
+        return Objects.requireNonNull(this.getConfigYml().toBukkit());
+    }
+
+    /**
+     * Does not use eco config system, don't use.
+     *
+     * @deprecated Use eco config system.
+     */
+    @Override
+    @Deprecated
+    public final void saveConfig() {
+        this.getLogger().warning("Call to default config method in eco plugin!");
+
+        super.saveConfig();
+    }
+
+    /**
+     * Does not use eco config system, don't use.
+     *
+     * @deprecated Use eco config system.
+     */
+    @Override
+    @Deprecated
+    public final void saveDefaultConfig() {
+        this.getLogger().warning("Call to default config method in eco plugin!");
+
+        super.saveDefaultConfig();
+    }
+
+    /**
+     * Does not use eco config system, don't use.
+     *
+     * @deprecated Use eco config system.
+     */
+    @Override
+    @Deprecated
+    public final void reloadConfig() {
+        this.getLogger().warning("Call to default config method in eco plugin!");
+
+        super.reloadConfig();
+    }
+
+    /**
+     * Get an EcoPlugin by name.
+     *
+     * @param pluginName The name.
+     * @return The plugin.
+     */
+    public static EcoPlugin getPlugin(@NotNull final String pluginName) {
+        return Eco.getHandler().getPluginByName(pluginName);
+    }
+
+    /**
+     * Get all EcoPlugin names.
+     *
+     * @return The set of names.
+     */
+    public static Set<String> getPluginNames() {
+        return new HashSet<>(Eco.getHandler().getLoadedPlugins());
+    }
+
+    /**
+     * Get the polymart resource ID.
+     *
+     * @return The resource ID.
+     */
+    public int getResourceId() {
+        return this.resourceId;
+    }
+
+    /**
+     * Get the bStats ID.
+     *
+     * @return The ID.
+     */
+    public int getBStatsId() {
+        return this.bStatsId;
+    }
+
+    /**
+     * Get the proxy package.
+     *
+     * @return The package where proxies are contained.
+     */
+    public String getProxyPackage() {
+        return this.proxyPackage;
+    }
+
+    /**
+     * Get the plugin color (uses legacy formatting).
+     *
+     * @return The color.
+     */
+    public String getColor() {
+        return this.color;
+    }
+
+    /**
+     * Get all loaded integration names.
+     *
+     * @return The integrations.
+     */
+    public Set<String> getLoadedIntegrations() {
+        return this.loadedIntegrations;
+    }
+
+    /**
+     * Get the scheduler.
+     *
+     * @return The scheduler.
+     */
+    public Scheduler getScheduler() {
+        return this.scheduler;
+    }
+
+    /**
+     * Get the event manager.
+     *
+     * @return The event manager.
+     */
+    public EventManager getEventManager() {
+        return this.eventManager;
+    }
+
+    /**
+     * Get config.yml.
+     *
+     * @return config.yml.
+     */
+    public ConfigYml getConfigYml() {
+        return this.configYml;
+    }
+
+    /**
+     * Get lang.yml.
+     *
+     * @return lang.yml.
+     */
+    public LangYml getLangYml() {
+        return this.langYml;
+    }
+
+    /**
+     * Get the NamespacedKey factory.
+     *
+     * @return The factory.
+     */
+    public NamespacedKeyFactory getNamespacedKeyFactory() {
+        return this.namespacedKeyFactory;
+    }
+
+    /**
+     * Get the metadata value factory.
+     *
+     * @return The factory.
+     */
+    public MetadataValueFactory getMetadataValueFactory() {
+        return this.metadataValueFactory;
+    }
+
+    /**
+     * Get the runnable factory.
+     *
+     * @return The runnable factory.
+     */
+    public RunnableFactory getRunnableFactory() {
+        return this.runnableFactory;
+    }
+
+    /**
+     * Get the extension loader.
+     *
+     * @return The extension loader.
+     */
+    public ExtensionLoader getExtensionLoader() {
+        return this.extensionLoader;
+    }
+
+    /**
+     * Get the config handler.
+     *
+     * @return The config handler.
+     */
+    public ConfigHandler getConfigHandler() {
+        return this.configHandler;
+    }
+
+    /**
+     * Get the plugin's display module.
+     *
+     * @return The display module.
+     */
+    @Nullable
+    public DisplayModule getDisplayModule() {
+        return this.displayModule;
+    }
+
+    /**
+     * Get if the plugin is outdated.
+     *
+     * @return If outdated.
+     */
+    public boolean isOutdated() {
+        return this.outdated;
+    }
+
+    /**
+     * Get if the plugin supports extensions.
+     *
+     * @return If extensions are supported.
+     */
+    public boolean isSupportingExtensions() {
+        return this.supportingExtensions;
+    }
+
+    /**
+     * Get the proxy factory.
+     *
+     * @return The proxy factory.
+     */
+    @Nullable
+    public ProxyFactory getProxyFactory() {
+        return this.proxyFactory;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/Handler.java

@@ -0,0 +1,312 @@
+package com.willfp.eco.core;
+
+import com.willfp.eco.core.config.updating.ConfigHandler;
+import com.willfp.eco.core.config.wrapper.ConfigFactory;
+import com.willfp.eco.core.data.ExtendedPersistentDataContainer;
+import com.willfp.eco.core.data.ProfileHandler;
+import com.willfp.eco.core.data.keys.KeyRegistry;
+import com.willfp.eco.core.drops.DropQueueFactory;
+import com.willfp.eco.core.entities.ai.EntityController;
+import com.willfp.eco.core.events.EventManager;
+import com.willfp.eco.core.extensions.ExtensionLoader;
+import com.willfp.eco.core.factory.MetadataValueFactory;
+import com.willfp.eco.core.factory.NamespacedKeyFactory;
+import com.willfp.eco.core.factory.RunnableFactory;
+import com.willfp.eco.core.fast.FastItemStack;
+import com.willfp.eco.core.gui.GUIFactory;
+import com.willfp.eco.core.integrations.placeholder.PlaceholderIntegration;
+import com.willfp.eco.core.items.SNBTHandler;
+import com.willfp.eco.core.proxy.Cleaner;
+import com.willfp.eco.core.proxy.ProxyFactory;
+import com.willfp.eco.core.scheduling.Scheduler;
+import net.kyori.adventure.platform.bukkit.BukkitAudiences;
+import org.bukkit.Location;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Mob;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.persistence.PersistentDataContainer;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+import java.util.logging.Logger;
+
+/**
+ * @see Eco#getHandler()
+ */
+@ApiStatus.Internal
+public interface Handler {
+    /**
+     * Create a scheduler.
+     *
+     * @param plugin The plugin.
+     * @return The scheduler.
+     */
+    @NotNull
+    Scheduler createScheduler(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create an event manager.
+     *
+     * @param plugin The plugin.
+     * @return The event manager.
+     */
+    @NotNull
+    EventManager createEventManager(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create a NamespacedKey factory.
+     *
+     * @param plugin The plugin.
+     * @return The factory.
+     */
+    @NotNull
+    NamespacedKeyFactory createNamespacedKeyFactory(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create a MetadataValue factory.
+     *
+     * @param plugin The plugin.
+     * @return The factory.
+     */
+    @NotNull
+    MetadataValueFactory createMetadataValueFactory(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create a Runnable factory.
+     *
+     * @param plugin The plugin.
+     * @return The factory.
+     */
+    @NotNull
+    RunnableFactory createRunnableFactory(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create an ExtensionLoader.
+     *
+     * @param plugin The plugin.
+     * @return The factory.
+     */
+    @NotNull
+    ExtensionLoader createExtensionLoader(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create a config handler.
+     *
+     * @param plugin The plugin.
+     * @return The handler.
+     */
+    @NotNull
+    ConfigHandler createConfigHandler(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create a logger.
+     *
+     * @param plugin The plugin.
+     * @return The logger.
+     */
+    @NotNull
+    Logger createLogger(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create a PAPI integration.
+     *
+     * @param plugin The plugin.
+     * @return The integration.
+     */
+    @NotNull
+    PlaceholderIntegration createPAPIIntegration(@NotNull EcoPlugin plugin);
+
+    /**
+     * Create a proxy factory.
+     *
+     * @param plugin The plugin.
+     * @return The factory.
+     */
+    @NotNull
+    ProxyFactory createProxyFactory(@NotNull EcoPlugin plugin);
+
+    /**
+     * Get eco Spigot plugin.
+     *
+     * @return The plugin.
+     */
+    @NotNull
+    EcoPlugin getEcoPlugin();
+
+    /**
+     * Get config factory.
+     *
+     * @return The factory.
+     */
+    @NotNull
+    ConfigFactory getConfigFactory();
+
+    /**
+     * Get drop queue factory.
+     *
+     * @return The factory.
+     */
+    @NotNull
+    DropQueueFactory getDropQueueFactory();
+
+    /**
+     * Get GUI factory.
+     *
+     * @return The factory.
+     */
+    @NotNull
+    GUIFactory getGUIFactory();
+
+    /**
+     * Get cleaner.
+     *
+     * @return The cleaner.
+     */
+    @NotNull
+    Cleaner getCleaner();
+
+    /**
+     * Add new plugin.
+     *
+     * @param plugin The plugin.
+     */
+    void addNewPlugin(@NotNull EcoPlugin plugin);
+
+    /**
+     * Get plugin by name.
+     *
+     * @param name The name.
+     * @return The plugin.
+     */
+    @Nullable
+    EcoPlugin getPluginByName(@NotNull String name);
+
+    /**
+     * Get all loaded eco plugins.
+     *
+     * @return A list of plugin names in lowercase.
+     */
+    @NotNull
+    List<String> getLoadedPlugins();
+
+    /**
+     * Create a FastItemStack.
+     *
+     * @param itemStack The base ItemStack.
+     * @return The FastItemStack.
+     */
+    @NotNull
+    FastItemStack createFastItemStack(@NotNull ItemStack itemStack);
+
+    /**
+     * Register bStats metrics.
+     *
+     * @param plugin The plugin.
+     */
+    void registerBStats(@NotNull EcoPlugin plugin);
+
+    /**
+     * Get Adventure audiences.
+     *
+     * @return The audiences.
+     */
+    @Nullable
+    BukkitAudiences getAdventure();
+
+    /**
+     * Get the key registry.
+     *
+     * @return The registry.
+     */
+    @NotNull
+    KeyRegistry getKeyRegistry();
+
+    /**
+     * Get the PlayerProfile handler.
+     *
+     * @return The handler.
+     */
+    @NotNull
+    ProfileHandler getProfileHandler();
+
+    /**
+     * Create dummy entity - never spawned, exists purely in code.
+     *
+     * @param location The location.
+     * @return The entity.
+     */
+    @NotNull
+    Entity createDummyEntity(@NotNull Location location);
+
+    /**
+     * Create a {@link NamespacedKey} quickly
+     * <p>
+     * Bypasses the constructor, allowing for the creation of invalid keys,
+     * therefore this is considered unsafe and should only be called after
+     * the key has been confirmed to be valid.
+     *
+     * @param namespace The namespace.
+     * @param key       The key.
+     * @return The key.
+     */
+    @NotNull
+    NamespacedKey createNamespacedKey(@NotNull String namespace,
+                                      @NotNull String key);
+
+    /**
+     * Return or get props for a plugin.
+     *
+     * @param existing The existing constructor props.
+     * @param plugin   The plugin.
+     * @return The props.
+     */
+    @NotNull
+    PluginProps getProps(@Nullable PluginProps existing,
+                         @NotNull Class<? extends EcoPlugin> plugin);
+
+    /**
+     * Format a string with MiniMessage.
+     *
+     * @param message The message.
+     * @return The formatted string.
+     */
+    @NotNull
+    String formatMiniMessage(@NotNull String message);
+
+    /**
+     * Create controlled entity from a mob.
+     *
+     * @param mob The mob.
+     * @param <T> The mob type.
+     * @return The controlled entity.
+     */
+    @NotNull <T extends Mob> EntityController<T> createEntityController(@NotNull T mob);
+
+    /**
+     * Adapt base PDC to extended PDC.
+     *
+     * @param container The container.
+     * @return The extended container.
+     */
+    @NotNull
+    ExtendedPersistentDataContainer adaptPdc(@NotNull PersistentDataContainer container);
+
+    /**
+     * Create new PDC.
+     *
+     * @return The container.
+     */
+    @NotNull
+    PersistentDataContainer newPdc();
+
+    /**
+     * Get SNBT handler.
+     *
+     * @return The SNBT handler.
+     */
+    @NotNull
+    SNBTHandler getSNBTHandler();
+}

eco-api/src/main/java/com/willfp/eco/core/PluginDependent.java

@@ -0,0 +1,42 @@
+package com.willfp.eco.core;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Quick DI class to manage passing eco plugins.
+ * <p>
+ * Basically just a quick bit of laziness if you can't be bothered to add a private field
+ * and a protected getter, don't use this in kotlin as you can just specify
+ * {@code
+ * private val plugin: EcoPlugin
+ * }
+ * in the constructor.
+ *
+ * @param <T> The eco plugin type.
+ */
+public abstract class PluginDependent<T extends EcoPlugin> {
+    /**
+     * The {@link EcoPlugin} that is stored.
+     */
+    @NotNull
+    private final T plugin;
+
+    /**
+     * Pass an {@link EcoPlugin} in order to interface with it.
+     *
+     * @param plugin The plugin to manage.
+     */
+    protected PluginDependent(@NotNull final T plugin) {
+        this.plugin = plugin;
+    }
+
+    /**
+     * Get the plugin.
+     *
+     * @return The plugin.
+     */
+    @NotNull
+    protected T getPlugin() {
+        return this.plugin;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/PluginLike.java

@@ -0,0 +1,37 @@
+package com.willfp.eco.core;
+
+import com.willfp.eco.core.config.updating.ConfigHandler;
+
+import java.io.File;
+import java.util.logging.Logger;
+
+/**
+ * Represents any class that acts like a plugin, for example {@link EcoPlugin}
+ * or {@link com.willfp.eco.core.extensions.Extension}. This exists to create
+ * things such as extension base configs rather than needing to pass an instance
+ * of the owning plugin.
+ */
+public interface PluginLike {
+    /**
+     * Get the data folder of the object.
+     * <p>
+     * Returns the plugin data folder for a plugin, or the extension's parent plugin's folder
+     *
+     * @return The data folder.
+     */
+    File getDataFolder();
+
+    /**
+     * Get the handler class for updatable classes.
+     *
+     * @return The config handler.
+     */
+    ConfigHandler getConfigHandler();
+
+    /**
+     * Get the logger.
+     *
+     * @return The logger.
+     */
+    Logger getLogger();
+}

eco-api/src/main/java/com/willfp/eco/core/PluginProps.java

@@ -0,0 +1,273 @@
+package com.willfp.eco.core;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Plugin props are the arguments related to the plugin that are required on start-up.
+ * <p>
+ * This class is complex in how it works intentionally. This is done so that fields can be
+ * added to the props without breaking API backwards compatibility. Thus, there is no public
+ * constructor and no way to instantiate props without creating a parser.
+ */
+public final class PluginProps {
+    /**
+     * All registered parsers.
+     */
+    private static final Map<Class<?>, PropsParser<?>> REGISTERED_PARSERS = new HashMap<>();
+
+    /**
+     * The polymart resource ID.
+     */
+    @Nullable
+    private Integer resourceId;
+
+    /**
+     * The bStats ID.
+     */
+    @Nullable
+    private Integer bStatsId;
+
+    /**
+     * The proxy package.
+     */
+    @Nullable
+    private String proxyPackage;
+
+    /**
+     * The color.
+     */
+    @Nullable
+    private String color;
+
+    /**
+     * If extensions are supported.
+     */
+    @Nullable
+    private Boolean supportingExtensions;
+
+    /**
+     * Create new blank props.
+     */
+    private PluginProps() {
+
+    }
+
+    /**
+     * Get resource ID.
+     *
+     * @return The resource ID.
+     */
+    public int getResourceId() {
+        assert resourceId != null;
+        return resourceId;
+    }
+
+    /**
+     * Set resource ID.
+     *
+     * @param resourceId The resource ID.
+     */
+    public void setResourceId(final int resourceId) {
+        this.resourceId = resourceId;
+    }
+
+    /**
+     * Get bStats ID.
+     *
+     * @return The bStats ID.
+     */
+    public int getBStatsId() {
+        assert bStatsId != null;
+        return bStatsId;
+    }
+
+    /**
+     * Set bStats ID.
+     *
+     * @param bStatsId The bStats ID.
+     */
+    public void setBStatsId(final int bStatsId) {
+        this.bStatsId = bStatsId;
+    }
+
+    /**
+     * Get the proxy package.
+     *
+     * @return The package.
+     */
+    @NotNull
+    public String getProxyPackage() {
+        assert proxyPackage != null;
+        return proxyPackage;
+    }
+
+    /**
+     * Set the proxy package.
+     *
+     * @param proxyPackage The proxy package.
+     */
+    public void setProxyPackage(@NotNull final String proxyPackage) {
+        this.proxyPackage = proxyPackage;
+    }
+
+    /**
+     * Get color.
+     *
+     * @return The color.
+     */
+    @NotNull
+    public String getColor() {
+        assert color != null;
+        return color;
+    }
+
+    /**
+     * Set the color.
+     *
+     * @param color The color.
+     */
+    public void setColor(@NotNull final String color) {
+        this.color = color;
+    }
+
+    /**
+     * Get if extensions are supported.
+     *
+     * @return If supported.
+     */
+    public boolean isSupportingExtensions() {
+        assert supportingExtensions != null;
+        return supportingExtensions;
+    }
+
+    /**
+     * Set if extensions are supported.
+     *
+     * @param supportingExtensions If supported.
+     */
+    public void setSupportingExtensions(final boolean supportingExtensions) {
+        this.supportingExtensions = supportingExtensions;
+    }
+
+    /**
+     * Ensure that all required props have been set.
+     */
+    public void validate() {
+        if (
+                supportingExtensions == null
+                        || proxyPackage == null
+                        || color == null
+                        || bStatsId == null
+                        || resourceId == null
+        ) {
+            throw new IllegalStateException("Missing required props!");
+        }
+    }
+
+    /**
+     * Parse props from source.
+     *
+     * @param source      The source.
+     * @param sourceClass The source class.
+     * @param <T>         The source type.
+     * @return The props.
+     */
+    public static <T> PluginProps parse(@NotNull final T source,
+                                        @NotNull final Class<? extends T> sourceClass) {
+        for (Map.Entry<Class<?>, PropsParser<?>> entry : REGISTERED_PARSERS.entrySet()) {
+            Class<?> clazz = entry.getKey();
+
+            if (clazz.equals(sourceClass)) {
+                @SuppressWarnings("unchecked")
+                PropsParser<T> parser = (PropsParser<T>) entry.getValue();
+                return parser.parseFrom(source);
+            }
+        }
+
+        throw new IllegalArgumentException("No parser exists for class " + sourceClass);
+    }
+
+    /**
+     * Register a parser for a type.
+     *
+     * @param clazz  The class.
+     * @param parser The parser.
+     * @param <T>    The source type.
+     */
+    public static <T> void registerParser(@NotNull final Class<T> clazz,
+                                          @NotNull final PropsParser<T> parser) {
+        REGISTERED_PARSERS.put(clazz, parser);
+    }
+
+    /**
+     * Get if there is a registered parser for a class.
+     *
+     * @param clazz The class.
+     * @return If there is a parser registered.
+     */
+    public static boolean hasParserFor(@NotNull final Class<?> clazz) {
+        for (Class<?> test : REGISTERED_PARSERS.keySet()) {
+            if (test.equals(clazz)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Create new props from known values.
+     *
+     * Marked as internal as this method will break whenever the properties themselves
+     * are updated (e.g. if a new property is added) - so to prevent any potential
+     * backwards-compatibility bugs, this method cannot be invoked outside eco itself.
+     *
+     * @param resourceId         The ID of the plugin on polymart.
+     * @param bStatsId           The ID of the plugin on bStats.
+     * @param proxyPackage       The package where proxies can be found.
+     * @param color              The primary color of the plugin.
+     * @param supportsExtensions If the plugin should attempt to look for extensions.
+     * @return The props.
+     */
+    static PluginProps createSimple(final int resourceId,
+                                    final int bStatsId,
+                                    @NotNull final String proxyPackage,
+                                    @NotNull final String color,
+                                    final boolean supportsExtensions) {
+        PluginProps props = new PluginProps();
+        props.setResourceId(resourceId);
+        props.setBStatsId(bStatsId);
+        props.setProxyPackage(proxyPackage);
+        props.setColor(color);
+        props.setSupportingExtensions(supportsExtensions);
+        return props;
+    }
+
+    /**
+     * Parse arguments into props for a plugin.
+     *
+     * @param <T> The type of source.
+     */
+    public interface PropsParser<T> {
+        /**
+         * Parse props from a given source.
+         *
+         * @param source The source.
+         * @return The props.
+         */
+        PluginProps parseFrom(@NotNull T source);
+
+        /**
+         * Get a new, blank props instance.
+         *
+         * @return Blank props.
+         */
+        default PluginProps getBlankProps() {
+            return new PluginProps();
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/Prerequisite.java

@@ -0,0 +1,162 @@
+package com.willfp.eco.core;
+
+import com.willfp.eco.core.integrations.economy.EconomyManager;
+import com.willfp.eco.core.proxy.ProxyConstants;
+import com.willfp.eco.util.ClassUtils;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Supplier;
+
+/**
+ * A prerequisite is a requirement for something.
+ * <p>
+ * For example, you can require the server to have paper or be a specific version,
+ * or have some other dependency.
+ */
+public class Prerequisite {
+    /**
+     * All existing prerequisites are registered on creation.
+     */
+    private static final List<Prerequisite> VALUES = new ArrayList<>();
+
+    /**
+     * Requires the server to be running an implementation of paper.
+     */
+    public static final Prerequisite HAS_PAPER = new Prerequisite(
+            () -> ClassUtils.exists("com.destroystokyo.paper.event.block.BeaconEffectEvent"),
+            "Requires server to be running paper (or a fork)"
+    );
+
+    /**
+     * Requires the server to have vault installed.
+     *
+     * @deprecated Use {@link EconomyManager#hasRegistrations()} instead.
+     */
+    @Deprecated(forRemoval = true)
+    public static final Prerequisite HAS_VAULT = new Prerequisite(
+            () -> ClassUtils.exists("net.milkbowl.vault.economy.Economy"),
+            "Requires server to have vault"
+    );
+
+    /**
+     * Requires the server to be running 1.19.
+     */
+    public static final Prerequisite HAS_1_19 = new Prerequisite(
+            () -> ProxyConstants.NMS_VERSION.contains("19"),
+            "Requires server to be running 1.19+"
+    );
+
+    /**
+     * Requires the server to be running 1.18.
+     */
+    public static final Prerequisite HAS_1_18 = new Prerequisite(
+            () -> ProxyConstants.NMS_VERSION.contains("18") || HAS_1_19.isMet(),
+            "Requires server to be running 1.18+"
+    );
+
+    /**
+     * Requires the server to be running 1.17.
+     *
+     * @deprecated eco no longer supports versions before 1.17.
+     */
+    @Deprecated(since = "6.25.2", forRemoval = true)
+    public static final Prerequisite HAS_1_17 = new Prerequisite(
+            () -> ProxyConstants.NMS_VERSION.contains("17") || HAS_1_18.isMet(),
+            "Requires server to be running 1.17+"
+    );
+
+    /**
+     * Requires the server to be running an implementation of BungeeCord.
+     */
+    public static final Prerequisite HAS_BUNGEECORD = new Prerequisite(
+            () -> ClassUtils.exists("net.md_5.bungee.api.event.ServerConnectedEvent"),
+            "Requires server to be running BungeeCord (or a fork)"
+    );
+
+    /**
+     * Requires the server to be running an implementation of Velocity.
+     */
+    public static final Prerequisite HAS_VELOCITY = new Prerequisite(
+            () -> ClassUtils.exists("com.velocitypowered.api.event.player.ServerConnectedEvent"),
+            "Requires server to be running Velocity (or a fork)"
+    );
+
+    /**
+     * If the necessary prerequisite condition has been met.
+     */
+    private boolean isMet;
+
+    /**
+     * Retrieve if the necessary prerequisite condition is met.
+     */
+    private final Supplier<Boolean> isMetSupplier;
+
+    /**
+     * The description of the requirements of the prerequisite.
+     */
+    private final String description;
+
+    /**
+     * Create a prerequisite.
+     *
+     * @param isMetSupplier An {@link Supplier<Boolean>} that returns if the prerequisite is met
+     * @param description   The description of the prerequisite, shown to the user if it isn't
+     */
+    public Prerequisite(@NotNull final Supplier<Boolean> isMetSupplier,
+                        @NotNull final String description) {
+        this.isMetSupplier = isMetSupplier;
+        this.isMet = isMetSupplier.get();
+        this.description = description;
+        VALUES.add(this);
+    }
+
+    /**
+     * Refresh the condition set in the supplier, updates {@link this#isMet}.
+     */
+    private void refresh() {
+        this.isMet = this.isMetSupplier.get();
+    }
+
+    /**
+     * Update all prerequisites' {@link Prerequisite#isMet}.
+     */
+    public static void update() {
+        VALUES.forEach(Prerequisite::refresh);
+    }
+
+    /**
+     * Check if all prerequisites in array are met.
+     *
+     * @param prerequisites A primitive array of prerequisites to check.
+     * @return If all the prerequisites are met.
+     */
+    public static boolean areMet(@NotNull final Prerequisite[] prerequisites) {
+        update();
+        return Arrays.stream(prerequisites).allMatch(Prerequisite::isMet);
+    }
+
+    static {
+        update();
+    }
+
+    /**
+     * Get if the prerequisite is met.
+     *
+     * @return If the condition is met.
+     */
+    public boolean isMet() {
+        return this.isMet;
+    }
+
+    /**
+     * Get the description.
+     *
+     * @return The description.
+     */
+    public String getDescription() {
+        return this.description;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/command/CommandBase.java

@@ -0,0 +1,117 @@
+package com.willfp.eco.core.command;
+
+import com.willfp.eco.core.EcoPlugin;
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Interface for all command implementations.
+ */
+@SuppressWarnings("removal")
+public interface CommandBase {
+    /**
+     * Get command name.
+     *
+     * @return The name.
+     */
+    String getName();
+
+    /**
+     * Get command permission.
+     *
+     * @return The permission.
+     */
+    String getPermission();
+
+    /**
+     * If only players can execute the command.
+     *
+     * @return If true.
+     */
+    boolean isPlayersOnly();
+
+    /**
+     * Add a subcommand to the command.
+     *
+     * @param command The subcommand.
+     * @return The parent command.
+     */
+    CommandBase addSubcommand(@NotNull CommandBase command);
+
+    /**
+     * Handle command execution.
+     * <p>
+     * Marked as default void with no implementation for backwards compatibility.
+     *
+     * @param sender The sender.
+     * @param args   The args.
+     */
+    default void onExecute(@NotNull CommandSender sender,
+                           @NotNull List<String> args) {
+        // Do nothing.
+    }
+
+    /**
+     * Handle tab completion.
+     * <p>
+     * Marked as default void with no implementation for backwards compatibility.
+     *
+     * @param sender The sender.
+     * @param args   The args.
+     * @return The results.
+     */
+    default List<String> tabComplete(@NotNull CommandSender sender,
+                                     @NotNull List<String> args) {
+        return new ArrayList<>();
+    }
+
+    /**
+     * Get the plugin.
+     *
+     * @return The plugin.
+     */
+    EcoPlugin getPlugin();
+
+    /**
+     * Get the handler.
+     *
+     * @return The handler.
+     * @see CommandHandler
+     * @deprecated Use {@link CommandBase#onExecute(CommandSender, List)} instead.
+     */
+    @Deprecated(forRemoval = true)
+    CommandHandler getHandler();
+
+    /**
+     * Set the handler.
+     *
+     * @param handler The handler.
+     * @see CommandHandler
+     * @deprecated Handlers have been deprecated.
+     */
+    @Deprecated(forRemoval = true)
+    void setHandler(@NotNull CommandHandler handler);
+
+    /**
+     * Get the tab completer.
+     *
+     * @return The tab completer.
+     * @see TabCompleteHandler
+     * @deprecated Use {@link CommandBase#tabComplete(CommandSender, List)} instead.
+     */
+    @Deprecated(forRemoval = true)
+    TabCompleteHandler getTabCompleter();
+
+    /**
+     * Set the tab completer.
+     *
+     * @param handler The handler.
+     * @see TabCompleteHandler
+     * @deprecated Handlers have been deprecated.
+     */
+    @Deprecated(forRemoval = true)
+    void setTabCompleter(@NotNull TabCompleteHandler handler);
+}

eco-api/src/main/java/com/willfp/eco/core/command/CommandHandler.java

@@ -0,0 +1,29 @@
+package com.willfp.eco.core.command;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * A command handler handles the actual code for a command.
+ * <p>
+ * The replacement for {@link org.bukkit.command.CommandExecutor#onCommand(CommandSender, Command, String, String[])}
+ *
+ * @see CommandBase
+ * @deprecated Handlers have been deprecated. This legacy system will eventually be removed,
+ * update to use the new system: {@link CommandBase#onExecute(CommandSender, List)}.
+ */
+@FunctionalInterface
+@Deprecated(since = "6.17.0", forRemoval = true)
+public interface CommandHandler {
+    /**
+     * The code to be called on execution.
+     *
+     * @param sender The sender.
+     * @param args   The arguments.
+     */
+    void onExecute(@NotNull CommandSender sender,
+                   @NotNull List<String> args);
+}

eco-api/src/main/java/com/willfp/eco/core/command/TabCompleteHandler.java

@@ -0,0 +1,30 @@
+package com.willfp.eco.core.command;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * A Tab Complete handler handles the actual tab-completion code.
+ * <p>
+ * The replacement for {@link org.bukkit.command.TabCompleter#onTabComplete(CommandSender, Command, String, String[])}
+ *
+ * @see CommandBase
+ * @deprecated Handlers have been deprecated. This legacy system will eventually be removed,
+ * update to use the new system: {@link CommandBase#tabComplete(CommandSender, List)}
+ */
+@FunctionalInterface
+@Deprecated(since = "6.17.0", forRemoval = true)
+public interface TabCompleteHandler {
+    /**
+     * Handle Tab Completion.
+     *
+     * @param sender The sender.
+     * @param args   The arguments.
+     * @return The tab completion results.
+     */
+    List<String> tabComplete(@NotNull CommandSender sender,
+                             @NotNull List<String> args);
+}

eco-api/src/main/java/com/willfp/eco/core/command/impl/HandledCommand.java

@@ -0,0 +1,287 @@
+package com.willfp.eco.core.command.impl;
+
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.command.CommandBase;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Abstract class for commands that can be handled.
+ * <p>
+ * Handled commands have a method to pass in raw input from bukkit commands
+ * in order to execute the command-specific code. It's essentially an internal
+ * layer, hence why it's a package-private class.
+ */
+@SuppressWarnings({"DeprecatedIsStillUsed", "removal"})
+abstract class HandledCommand implements CommandBase {
+    /**
+     * The plugin.
+     */
+    private final EcoPlugin plugin;
+
+    /**
+     * The name of the command.
+     */
+    private final String name;
+
+    /**
+     * The permission required to execute the command.
+     * <p>
+     * Written out as a string for flexibility with subclasses.
+     */
+    private final String permission;
+
+    /**
+     * Should the command only be allowed to be executed by players?
+     * <p>
+     * In other worlds, only allowed to be executed by console.
+     */
+    private final boolean playersOnly;
+
+    /**
+     * The actual code to be executed in the command.
+     */
+    @Deprecated
+    @Nullable
+    private com.willfp.eco.core.command.CommandHandler handler = null;
+
+    /**
+     * The tab completion code to be executed in the command.
+     */
+    @Deprecated
+    @Nullable
+    private com.willfp.eco.core.command.TabCompleteHandler tabCompleter = null;
+
+    /**
+     * All subcommands for the command.
+     */
+    private final List<CommandBase> subcommands;
+
+    /**
+     * Create a new command.
+     * <p>
+     * The name cannot be the same as an existing command as this will conflict.
+     *
+     * @param plugin      Instance of a plugin.
+     * @param name        The name used in execution.
+     * @param permission  The permission required to execute the command.
+     * @param playersOnly If only players should be able to execute this command.
+     */
+    HandledCommand(@NotNull final EcoPlugin plugin,
+                   @NotNull final String name,
+                   @NotNull final String permission,
+                   final boolean playersOnly) {
+        this.plugin = plugin;
+        this.name = name;
+        this.permission = permission;
+        this.playersOnly = playersOnly;
+        this.subcommands = new ArrayList<>();
+    }
+
+    /**
+     * Add a subcommand to the command.
+     *
+     * @param subcommand The subcommand.
+     * @return The parent command.
+     */
+    @Override
+    public final CommandBase addSubcommand(@NotNull final CommandBase subcommand) {
+        subcommands.add(subcommand);
+
+        return this;
+    }
+
+    /**
+     * Get the plugin.
+     *
+     * @return The plugin.
+     */
+    @Override
+    public EcoPlugin getPlugin() {
+        return this.plugin;
+    }
+
+    /**
+     * Handle the command.
+     *
+     * @param sender The sender.
+     * @param args   The arguments.
+     */
+    protected final void handle(@NotNull final CommandSender sender,
+                                @NotNull final String[] args) {
+        if (!canExecute(sender, this, this.getPlugin())) {
+            return;
+        }
+
+        if (args.length > 0) {
+            for (CommandBase subcommand : this.getSubcommands()) {
+                if (subcommand.getName().equalsIgnoreCase(args[0])) {
+                    if (!canExecute(sender, subcommand, this.getPlugin())) {
+                        return;
+                    }
+
+                    ((HandledCommand) subcommand).handle(sender, Arrays.copyOfRange(args, 1, args.length));
+
+                    return;
+                }
+            }
+        }
+
+        if (this.isPlayersOnly() && !(sender instanceof Player)) {
+            sender.sendMessage(this.getPlugin().getLangYml().getMessage("not-player"));
+            return;
+        }
+
+        if (this.getHandler() != null) {
+            this.getHandler().onExecute(sender, Arrays.asList(args));
+        } else {
+            this.onExecute(sender, Arrays.asList(args));
+        }
+    }
+
+    /**
+     * Handle the tab completion.
+     *
+     * @param sender The sender.
+     * @param args   The arguments.
+     * @return The tab completion results.
+     */
+    protected final List<String> handleTabCompletion(@NotNull final CommandSender sender,
+                                                     @NotNull final String[] args) {
+
+        if (!sender.hasPermission(this.getPermission())) {
+            return null;
+        }
+
+        if (args.length == 1) {
+            List<String> completions = new ArrayList<>();
+
+            StringUtil.copyPartialMatches(
+                    args[0],
+                    this.getSubcommands().stream()
+                            .filter(subCommand -> sender.hasPermission(subCommand.getPermission()))
+                            .map(CommandBase::getName)
+                            .collect(Collectors.toList()),
+                    completions
+            );
+
+            Collections.sort(completions);
+
+            if (!completions.isEmpty()) {
+                return completions;
+            }
+        }
+
+        if (args.length >= 2) {
+            HandledCommand command = null;
+
+            for (CommandBase subcommand : this.getSubcommands()) {
+                if (!sender.hasPermission(subcommand.getPermission())) {
+                    continue;
+                }
+
+                if (args[0].equalsIgnoreCase(subcommand.getName())) {
+                    command = (HandledCommand) subcommand;
+                }
+            }
+
+            if (command != null) {
+                return command.handleTabCompletion(sender, Arrays.copyOfRange(args, 1, args.length));
+            }
+        }
+
+        if (this.getTabCompleter() != null) {
+            return this.getTabCompleter().tabComplete(sender, Arrays.asList(args));
+        } else {
+            return this.tabComplete(sender, Arrays.asList(args));
+        }
+    }
+
+    /**
+     * If a sender can execute the command.
+     *
+     * @param sender  The sender.
+     * @param command The command.
+     * @param plugin  The plugin.
+     * @return If the sender can execute.
+     */
+    public static boolean canExecute(@NotNull final CommandSender sender,
+                                     @NotNull final CommandBase command,
+                                     @NotNull final EcoPlugin plugin) {
+        if (!sender.hasPermission(command.getPermission()) && sender instanceof Player) {
+            sender.sendMessage(plugin.getLangYml().getNoPermission());
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Get the command name.
+     *
+     * @return The name.
+     */
+    public String getName() {
+        return this.name;
+    }
+
+    /**
+     * Get the permission required to execute the command.
+     *
+     * @return The permission.
+     */
+    public String getPermission() {
+        return this.permission;
+    }
+
+    /**
+     * Get if the command can only be executed by players.
+     *
+     * @return If players only.
+     */
+    public boolean isPlayersOnly() {
+        return this.playersOnly;
+    }
+
+    /**
+     * Get the subcommands of the command.
+     *
+     * @return The subcommands.
+     */
+    public List<CommandBase> getSubcommands() {
+        return this.subcommands;
+    }
+
+    @Deprecated(forRemoval = true)
+    @Override
+    public @Nullable com.willfp.eco.core.command.CommandHandler getHandler() {
+        return this.handler;
+    }
+
+    @Deprecated(forRemoval = true)
+    @Override
+    public @Nullable com.willfp.eco.core.command.TabCompleteHandler getTabCompleter() {
+        return this.tabCompleter;
+    }
+
+    @Deprecated(forRemoval = true)
+    @Override
+    public void setHandler(@Nullable final com.willfp.eco.core.command.CommandHandler handler) {
+        this.handler = handler;
+    }
+
+    @Deprecated(forRemoval = true)
+    @Override
+    public void setTabCompleter(@Nullable final com.willfp.eco.core.command.TabCompleteHandler tabCompleter) {
+        this.tabCompleter = tabCompleter;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/command/impl/PluginCommand.java

@@ -0,0 +1,96 @@
+package com.willfp.eco.core.command.impl;
+
+import com.willfp.eco.core.EcoPlugin;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+/**
+ * PluginCommands are the class to be used instead of CommandExecutor,
+ * they function as the base command, e.g. {@code /ecoenchants} would be a base command, with each
+ * subsequent argument functioning as subcommands.
+ * <p>
+ * The command will not be registered until register() is called.
+ * <p>
+ * The name cannot be the same as an existing command as this will conflict.
+ */
+public abstract class PluginCommand extends HandledCommand implements CommandExecutor, TabCompleter {
+    /**
+     * Create a new command.
+     *
+     * @param plugin      The plugin.
+     * @param name        The name used in execution.
+     * @param permission  The permission required to execute the command.
+     * @param playersOnly If only players should be able to execute this command.
+     */
+    protected PluginCommand(@NotNull final EcoPlugin plugin,
+                            @NotNull final String name,
+                            @NotNull final String permission,
+                            final boolean playersOnly) {
+        super(plugin, name, permission, playersOnly);
+    }
+
+    /**
+     * Registers the command with the server,
+     * <p>
+     * Requires the command name to exist, defined in plugin.yml.
+     */
+    public final void register() {
+        org.bukkit.command.PluginCommand command = Bukkit.getPluginCommand(this.getName());
+        assert command != null;
+        command.setExecutor(this);
+        command.setTabCompleter(this);
+    }
+
+    /**
+     * Internal implementation used to clean up boilerplate.
+     * Used for parity with {@link CommandExecutor#onCommand(CommandSender, Command, String, String[])}.
+     *
+     * @param sender  The executor of the command.
+     * @param command The bukkit command.
+     * @param label   The name of the executed command.
+     * @param args    The arguments of the command (anything after the physical command name)
+     * @return If the command was processed by the linked {@link EcoPlugin}
+     */
+    @Override
+    public final boolean onCommand(@NotNull final CommandSender sender,
+                                   @NotNull final Command command,
+                                   @NotNull final String label,
+                                   @NotNull final String[] args) {
+        if (!command.getName().equalsIgnoreCase(this.getName())) {
+            return false;
+        }
+
+        this.handle(sender, args);
+
+        return true;
+    }
+
+    /**
+     * Internal implementation used to clean up boilerplate.
+     * Used for parity with {@link TabCompleter#onTabComplete(CommandSender, Command, String, String[])}.
+     *
+     * @param sender  The executor of the command.
+     * @param command The bukkit command.
+     * @param label   The name of the executed command.
+     * @param args    The arguments of the command (anything after the physical command name).
+     * @return The list of tab-completions.
+     */
+    @Override
+    public @Nullable List<String> onTabComplete(@NotNull final CommandSender sender,
+                                                @NotNull final Command command,
+                                                @NotNull final String label,
+                                                @NotNull final String[] args) {
+        if (!command.getName().equalsIgnoreCase(this.getName())) {
+            return null;
+        }
+
+        return this.handleTabCompletion(sender, args);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/command/impl/Subcommand.java

@@ -0,0 +1,38 @@
+package com.willfp.eco.core.command.impl;
+
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.command.CommandBase;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Subcommands can be added to PluginCommands or to other Subcommands.
+ */
+public abstract class Subcommand extends HandledCommand {
+    /**
+     * Create subcommand.
+     *
+     * @param plugin      The plugin.
+     * @param name        The subcommand name.
+     * @param permission  The subcommand permission.
+     * @param playersOnly If the subcommand only works on players.
+     */
+    protected Subcommand(@NotNull final EcoPlugin plugin,
+                         @NotNull final String name,
+                         @NotNull final String permission,
+                         final boolean playersOnly) {
+        super(plugin, name, permission, playersOnly);
+    }
+
+    /**
+     * Create subcommand.
+     *
+     * @param plugin The plugin.
+     * @param name   The name of the subcommand.
+     * @param parent The parent command.
+     */
+    protected Subcommand(@NotNull final EcoPlugin plugin,
+                         @NotNull final String name,
+                         @NotNull final CommandBase parent) {
+        super(plugin, name, parent.getPermission(), parent.isPlayersOnly());
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/BaseConfig.java

@@ -0,0 +1,53 @@
+package com.willfp.eco.core.config;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.wrapper.LoadableConfigWrapper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
+ * <p>
+ * Automatically updates.
+ */
+public abstract class BaseConfig extends LoadableConfigWrapper {
+    /**
+     * Create new Base Config.
+     *
+     * @param plugin       The plugin or extension.
+     * @param configName   The config name (excluding extension).
+     * @param removeUnused If unused sections should be removed.
+     * @param type         The config type.
+     */
+    protected BaseConfig(@NotNull final String configName,
+                         @NotNull final PluginLike plugin,
+                         final boolean removeUnused,
+                         @NotNull final ConfigType type) {
+        this(configName, plugin, removeUnused, type, true);
+    }
+
+    /**
+     * Create new Base Config.
+     *
+     * @param plugin               The plugin or extension.
+     * @param configName           The config name (excluding extension).
+     * @param removeUnused         If unused sections should be removed.
+     * @param type                 The config type.
+     * @param requiresChangeToSave If changes must be applied to save the config.
+     */
+    protected BaseConfig(@NotNull final String configName,
+                         @NotNull final PluginLike plugin,
+                         final boolean removeUnused,
+                         @NotNull final ConfigType type,
+                         final boolean requiresChangeToSave) {
+        super(Eco.getHandler().getConfigFactory().createUpdatableConfig(
+                configName,
+                plugin,
+                "",
+                plugin.getClass(),
+                removeUnused,
+                type,
+                requiresChangeToSave
+        ));
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/BuildableConfig.java

@@ -0,0 +1,29 @@
+package com.willfp.eco.core.config;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Builder for configs to create them programmatically.
+ */
+public class BuildableConfig extends TransientConfig {
+    /**
+     * Create a new empty config builder.
+     */
+    public BuildableConfig() {
+        super();
+    }
+
+    /**
+     * Add to the config builder.
+     *
+     * @param path   The path.
+     * @param object The object.
+     * @return The builder.
+     */
+    public BuildableConfig add(@NotNull final String path,
+                               @Nullable final Object object) {
+        set(path, object);
+        return this;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/ConfigType.java

@@ -0,0 +1,36 @@
+package com.willfp.eco.core.config;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Config types, classified by file extension.
+ */
+public enum ConfigType {
+    /**
+     * .json config.
+     */
+    JSON("json"),
+
+    /**
+     * .yml config.
+     */
+    YAML("yml");
+
+    /**
+     * The file extension.
+     */
+    private final String extension;
+
+    ConfigType(@NotNull final String extension) {
+        this.extension = extension;
+    }
+
+    /**
+     * Get the file extension.
+     *
+     * @return The extension.
+     */
+    public String getExtension() {
+        return extension;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/ExtendableConfig.java

@@ -0,0 +1,45 @@
+package com.willfp.eco.core.config;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.wrapper.LoadableConfigWrapper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Config implementation for configs present in one of two places:
+ * <ul>
+ *     <li>Plugin base directory (eg config.yml, lang.json)</li>
+ *     <li>Other extension's configs</li>
+ * </ul>
+ * <p>
+ * Automatically updates.
+ */
+public abstract class ExtendableConfig extends LoadableConfigWrapper {
+    /**
+     * @param configName       The name of the config
+     * @param removeUnused     Whether keys not present in the default config should be removed on update.
+     * @param plugin           The plugin.
+     * @param updateBlacklist  Substring of keys to not add/remove keys for.
+     * @param subDirectoryPath The subdirectory path.
+     * @param type             The config type.
+     * @param source           The class that owns the resource.
+     */
+    protected ExtendableConfig(@NotNull final String configName,
+                               final boolean removeUnused,
+                               @NotNull final PluginLike plugin,
+                               @NotNull final Class<?> source,
+                               @NotNull final String subDirectoryPath,
+                               @NotNull final ConfigType type,
+                               @NotNull final String... updateBlacklist) {
+        super(Eco.getHandler().getConfigFactory().createUpdatableConfig(
+                configName,
+                plugin,
+                subDirectoryPath,
+                source,
+                removeUnused,
+                type,
+                true,
+                updateBlacklist
+        ));
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/StaticBaseConfig.java

@@ -0,0 +1,33 @@
+package com.willfp.eco.core.config;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.wrapper.LoadableConfigWrapper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Non-updatable yaml config that exists within a plugin jar.
+ */
+public abstract class StaticBaseConfig extends LoadableConfigWrapper {
+    /**
+     * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
+     * <p>
+     * Does not automatically update.
+     *
+     * @param configName The name of the config
+     * @param plugin     The plugin.
+     * @param type       The config type.
+     */
+    protected StaticBaseConfig(@NotNull final String configName,
+                               @NotNull final PluginLike plugin,
+                               @NotNull final ConfigType type) {
+        super(Eco.getHandler().getConfigFactory().createLoadableConfig(
+                configName,
+                plugin,
+                "",
+                plugin.getClass(),
+                type,
+                true
+        ));
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/TransientConfig.java

@@ -0,0 +1,122 @@
+package com.willfp.eco.core.config;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.config.wrapper.ConfigWrapper;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.file.Files;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Config that exists purely in the code, not linked to any file.
+ * <p>
+ * Use for inline configs to move data around or to add subsections to other configs.
+ */
+public class TransientConfig extends ConfigWrapper<Config> {
+    /**
+     * @param config The ConfigurationSection handle.
+     */
+    public TransientConfig(@NotNull final ConfigurationSection config) {
+        super(Eco.getHandler().getConfigFactory().createConfig(config));
+    }
+
+    /**
+     * Exists for backwards compatibility, YamlConfigurations are ConfigurationSections.
+     *
+     * @param config The YamlConfiguration handle.
+     */
+    public TransientConfig(@NotNull final YamlConfiguration config) {
+        this((ConfigurationSection) config);
+    }
+
+    /**
+     * @param stream The InputStream.
+     */
+    public TransientConfig(@Nullable final InputStream stream) {
+        super(stream != null ? Eco.getHandler().getConfigFactory().createConfig(YamlConfiguration.loadConfiguration(
+                new InputStreamReader(stream)
+        )) : new TransientConfig());
+    }
+
+    /**
+     * @param file The File.
+     * @deprecated Specify the config type to prevent bugs.
+     */
+    @Deprecated(since = "6.30.0", forRemoval = true)
+    public TransientConfig(@Nullable final File file) {
+        this(file, ConfigType.YAML);
+    }
+
+    /**
+     * @param file The file.
+     * @param type The config type to try read from.
+     */
+    public TransientConfig(@Nullable final File file,
+                           @NotNull final ConfigType type) {
+        super(file != null ? Eco.getHandler().getConfigFactory().createConfig(readFile(file), type)
+                : new TransientConfig());
+    }
+
+    /**
+     * Create a new empty transient config.
+     *
+     * @param values The values.
+     */
+    public TransientConfig(@NotNull final Map<String, Object> values) {
+        super(Eco.getHandler().getConfigFactory().createConfig(values, ConfigType.YAML));
+    }
+
+    /**
+     * Create a new empty transient config.
+     *
+     * @param values The values.
+     * @param type   The type.
+     */
+    public TransientConfig(@NotNull final Map<String, Object> values,
+                           @NotNull final ConfigType type) {
+        super(Eco.getHandler().getConfigFactory().createConfig(values, type));
+    }
+
+    /**
+     * Create a new empty transient config.
+     */
+    public TransientConfig() {
+        this(new HashMap<>(), ConfigType.JSON);
+    }
+
+    /**
+     * @param contents The contents of the config.
+     * @param type     The config type.
+     */
+    public TransientConfig(@NotNull final String contents,
+                           @NotNull final ConfigType type) {
+        super(Eco.getHandler().getConfigFactory().createConfig(contents, type));
+    }
+
+    /**
+     * Read a file to a string.
+     *
+     * @param file The file.
+     * @return The string.
+     */
+    private static String readFile(@Nullable final File file) {
+        if (file == null) {
+            return "";
+        }
+
+        try {
+            return Files.readString(file.toPath());
+        } catch (IOException e) {
+            return "";
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/base/ConfigYml.java

@@ -0,0 +1,55 @@
+package com.willfp.eco.core.config.base;
+
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.config.BaseConfig;
+import com.willfp.eco.core.config.ConfigType;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Default plugin config.yml.
+ */
+public class ConfigYml extends BaseConfig {
+    /**
+     * Config.yml.
+     *
+     * @param plugin The plugin.
+     */
+    public ConfigYml(@NotNull final EcoPlugin plugin) {
+        super("config", plugin, true, ConfigType.YAML);
+    }
+
+    /**
+     * Config.yml.
+     *
+     * @param plugin       The plugin.
+     * @param removeUnused Remove unused.
+     */
+    public ConfigYml(@NotNull final EcoPlugin plugin,
+                     final boolean removeUnused) {
+        super("config", plugin, removeUnused, ConfigType.YAML);
+    }
+
+    /**
+     * Config.yml.
+     *
+     * @param plugin The plugin.
+     * @param name   The config name.
+     */
+    public ConfigYml(@NotNull final EcoPlugin plugin,
+                     @NotNull final String name) {
+        super(name, plugin, true, ConfigType.YAML);
+    }
+
+    /**
+     * Config.yml.
+     *
+     * @param plugin       The plugin.
+     * @param name         The config name.
+     * @param removeUnused Remove unused.
+     */
+    public ConfigYml(@NotNull final EcoPlugin plugin,
+                     @NotNull final String name,
+                     final boolean removeUnused) {
+        super(name, plugin, removeUnused, ConfigType.YAML);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/base/LangYml.java

@@ -0,0 +1,61 @@
+package com.willfp.eco.core.config.base;
+
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.config.BaseConfig;
+import com.willfp.eco.core.config.ConfigType;
+import com.willfp.eco.util.StringUtils;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Default plugin lang.yml.
+ */
+public class LangYml extends BaseConfig {
+    /**
+     * Lang.yml.
+     *
+     * @param plugin The plugin.
+     */
+    public LangYml(@NotNull final EcoPlugin plugin) {
+        super("lang", plugin, false, ConfigType.YAML);
+    }
+
+    /**
+     * Get the prefix for messages in chat.
+     *
+     * @return The prefix.
+     */
+    public String getPrefix() {
+        return this.getFormattedString("messages.prefix");
+    }
+
+    /**
+     * Get the no permission message.
+     *
+     * @return The message.
+     */
+    public String getNoPermission() {
+        return getPrefix() + this.getFormattedString("messages.no-permission");
+    }
+
+    /**
+     * Get a chat message.
+     *
+     * @param message The key of the message.
+     * @return The message with a prefix appended.
+     */
+    public String getMessage(@NotNull final String message) {
+        return getMessage(message, StringUtils.FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a chat message.
+     *
+     * @param message The key of the message.
+     * @param option  The format options.
+     * @return The message with a prefix appended.
+     */
+    public String getMessage(@NotNull final String message,
+                             @NotNull final StringUtils.FormatOption option) {
+        return getPrefix() + this.getFormattedString("messages." + message, option);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/Config.java

@@ -0,0 +1,612 @@
+package com.willfp.eco.core.config.interfaces;
+
+import com.willfp.eco.core.config.BuildableConfig;
+import com.willfp.eco.core.config.ConfigType;
+import com.willfp.eco.core.config.TransientConfig;
+import com.willfp.eco.core.placeholder.AdditionalPlayer;
+import com.willfp.eco.core.placeholder.InjectablePlaceholder;
+import com.willfp.eco.core.placeholder.PlaceholderInjectable;
+import com.willfp.eco.util.NumberUtils;
+import com.willfp.eco.util.StringUtils;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * All configs implement this interface.
+ * <p>
+ * Contains all methods that must exist in yaml and json configurations.
+ */
+@SuppressWarnings("unused")
+public interface Config extends Cloneable, PlaceholderInjectable {
+    /**
+     * Clears cache.
+     * <p>
+     * Configs no longer have caches as they have in previous versions.
+     */
+    @Deprecated(since = "6.31.1", forRemoval = true)
+    default void clearCache() {
+        // Do nothing.
+    }
+
+    /**
+     * Convert the config into readable text.
+     *
+     * @return The plaintext.
+     */
+    String toPlaintext();
+
+    /**
+     * Get if the config contains a key.
+     *
+     * @param path The key to check.
+     * @return If contained.
+     */
+    boolean has(@NotNull String path);
+
+    /**
+     * Get config keys.
+     *
+     * @param deep If keys from subsections should be fetched too.
+     * @return A list of keys.
+     */
+    @NotNull
+    List<String> getKeys(boolean deep);
+
+    /**
+     * Recurse config keys.
+     *
+     * @param found The found keys.
+     * @param root  The root.
+     * @return The keys.
+     */
+    @NotNull
+    default List<String> recurseKeys(@NotNull Set<String> found,
+                                     @NotNull String root) {
+        return new ArrayList<>();
+    }
+
+    /**
+     * Get an object from config.
+     *
+     * @param path The path.
+     * @return The object.
+     */
+    @Nullable
+    Object get(@NotNull String path);
+
+    /**
+     * Set an object in config.
+     *
+     * @param path   The path.
+     * @param object The object.
+     */
+    void set(@NotNull String path,
+             @Nullable Object object);
+
+    /**
+     * Get subsection from config.
+     *
+     * @param path The key to check.
+     * @return The subsection. Returns an empty section if not found.
+     */
+    @NotNull
+    default Config getSubsection(@NotNull String path) {
+        return Objects.requireNonNullElse(getSubsectionOrNull(path), new TransientConfig());
+    }
+
+    /**
+     * Get subsection from config.
+     *
+     * @param path The key to check.
+     * @return The subsection, or null if not found.
+     */
+    @Nullable
+    Config getSubsectionOrNull(@NotNull String path);
+
+    /**
+     * Get an integer from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or 0 if not found.
+     */
+    default int getInt(@NotNull String path) {
+        return Objects.requireNonNullElse(getIntOrNull(path), 0);
+    }
+
+    /**
+     * Get an integer from config with a specified default (not found) value.
+     *
+     * @param path The key to fetch the value from.
+     * @param def  The value to default to if not found.
+     * @return The found value, or the default.
+     */
+    default int getInt(@NotNull String path,
+                       int def) {
+        return Objects.requireNonNullElse(getIntOrNull(path), def);
+    }
+
+    /**
+     * Get a decimal value via a mathematical expression.
+     *
+     * @param path The key to fetch the value from.
+     * @return The computed value, or 0 if not found or invalid.
+     */
+    default int getIntFromExpression(@NotNull String path) {
+        return getIntFromExpression(path, null);
+    }
+
+    /**
+     * Get a decimal value via a mathematical expression.
+     *
+     * @param path   The key to fetch the value from.
+     * @param player The player to evaluate placeholders with respect to.
+     * @return The computed value, or 0 if not found or invalid.
+     */
+    default int getIntFromExpression(@NotNull String path,
+                                     @Nullable Player player) {
+        return Double.valueOf(getDoubleFromExpression(path, player)).intValue();
+    }
+
+    /**
+     * Get a decimal value via a mathematical expression.
+     *
+     * @param path              The key to fetch the value from.
+     * @param player            The player to evaluate placeholders with respect to.
+     * @param additionalPlayers The additional players to evaluate placeholders with respect to.
+     * @return The computed value, or 0 if not found or invalid.
+     */
+    default int getIntFromExpression(@NotNull String path,
+                                     @Nullable Player player,
+                                     @NotNull Collection<AdditionalPlayer> additionalPlayers) {
+        return Double.valueOf(getDoubleFromExpression(path, player, additionalPlayers)).intValue();
+    }
+
+
+    /**
+     * Get an integer from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    Integer getIntOrNull(@NotNull String path);
+
+    /**
+     * Get a list of integers from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    default List<Integer> getInts(@NotNull String path) {
+        return Objects.requireNonNullElse(getIntsOrNull(path), new ArrayList<>());
+    }
+
+    /**
+     * Get a list of integers from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    List<Integer> getIntsOrNull(@NotNull String path);
+
+    /**
+     * Get a boolean from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or false if not found.
+     */
+    default boolean getBool(@NotNull String path) {
+        return Objects.requireNonNullElse(getBoolOrNull(path), false);
+    }
+
+    /**
+     * Get a boolean from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    Boolean getBoolOrNull(@NotNull String path);
+
+    /**
+     * Get a list of booleans from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    default List<Boolean> getBools(@NotNull String path) {
+        return Objects.requireNonNullElse(getBoolsOrNull(path), new ArrayList<>());
+    }
+
+    /**
+     * Get a list of booleans from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    List<Boolean> getBoolsOrNull(@NotNull String path);
+
+    /**
+     * Get a formatted string from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or an empty string if not found.
+     */
+    @NotNull
+    default String getFormattedString(@NotNull String path) {
+        return getString(path, true, StringUtils.FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a formatted string from config.
+     *
+     * @param path   The key to fetch the value from.
+     * @param option The format option.
+     * @return The found value, or an empty string if not found.
+     */
+    @NotNull
+    default String getFormattedString(@NotNull String path,
+                                      @NotNull StringUtils.FormatOption option) {
+        return getString(path, true, option);
+    }
+
+    /**
+     * Get a string from config.
+     * <p>
+     * Not formatted.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or an empty string if not found.
+     */
+    @NotNull
+    default String getString(@NotNull String path) {
+        return getString(path, false, StringUtils.FormatOption.WITHOUT_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a string from config.
+     *
+     * @param path   The key to fetch the value from.
+     * @param format If the string should be formatted.
+     * @param option The format option.
+     * @return The found value, or an empty string if not found.
+     */
+    @NotNull
+    default String getString(@NotNull String path,
+                             boolean format,
+                             @NotNull StringUtils.FormatOption option) {
+        return Objects.requireNonNullElse(getStringOrNull(path, format, option), "");
+    }
+
+    /**
+     * Get a formatted string from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or an empty string if not found.
+     */
+    @Nullable
+    default String getFormattedStringOrNull(@NotNull String path) {
+        return getStringOrNull(path, true, StringUtils.FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a formatted string from config.
+     *
+     * @param path   The key to fetch the value from.
+     * @param option The format option.
+     * @return The found value, or an empty string if not found.
+     */
+    @Nullable
+    default String getFormattedStringOrNull(@NotNull String path,
+                                            @NotNull StringUtils.FormatOption option) {
+        return getStringOrNull(path, true, option);
+    }
+
+    /**
+     * Get a string from config.
+     * <p>
+     * Formatted by default.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    default String getStringOrNull(@NotNull String path) {
+        return getStringOrNull(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a string from config.
+     *
+     * @param path   The key to fetch the value from.
+     * @param format If the string should be formatted.
+     * @param option The format option. If format is false, this will be ignored.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    String getStringOrNull(@NotNull String path,
+                           boolean format,
+                           @NotNull StringUtils.FormatOption option);
+
+    /**
+     * Get a list of strings from config.
+     * <p>
+     * Formatted by default.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    default List<String> getFormattedStrings(@NotNull String path) {
+        return getStrings(path, true, StringUtils.FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a list of strings from config.
+     * <p>
+     * Formatted by default.
+     *
+     * @param path   The key to fetch the value from.
+     * @param option The format option.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    default List<String> getFormattedStrings(@NotNull String path,
+                                             @NotNull StringUtils.FormatOption option) {
+        return getStrings(path, true, option);
+    }
+
+    /**
+     * Get a list of strings from config.
+     * <p>
+     * Not formatted.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    default List<String> getStrings(@NotNull String path) {
+        return getStrings(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a list of strings from config.
+     *
+     * @param path   The key to fetch the value from.
+     * @param format If the strings should be formatted.
+     * @param option The option.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    default List<String> getStrings(@NotNull String path,
+                                    boolean format,
+                                    @NotNull StringUtils.FormatOption option) {
+        return Objects.requireNonNullElse(getStringsOrNull(path, format, option), new ArrayList<>());
+    }
+
+    /**
+     * Get a list of strings from config.
+     * <p>
+     * Formatted.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    default List<String> getFormattedStringsOrNull(@NotNull String path) {
+        return getStringsOrNull(path, true, StringUtils.FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a list of strings from config.
+     * <p>
+     * Formatted.
+     *
+     * @param path   The key to fetch the value from.
+     * @param option The format option.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    default List<String> getFormattedStringsOrNull(@NotNull String path,
+                                                   @NotNull StringUtils.FormatOption option) {
+        return getStringsOrNull(path, true, option);
+    }
+
+    /**
+     * Get a list of strings from config.
+     * <p>
+     * Not formatted.
+     * <p>
+     * This will be changed in newer versions to <b>not</b> format by default.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    default List<String> getStringsOrNull(@NotNull String path) {
+        return getStringsOrNull(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
+    }
+
+    /**
+     * Get a list of strings from config.
+     *
+     * @param path   The key to fetch the value from.
+     * @param format If the strings should be formatted.
+     * @param option The format option.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    List<String> getStringsOrNull(@NotNull String path,
+                                  boolean format,
+                                  @NotNull StringUtils.FormatOption option);
+
+    /**
+     * Get a decimal from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or 0 if not found.
+     */
+    default double getDouble(@NotNull String path) {
+        return Objects.requireNonNullElse(getDoubleOrNull(path), 0.0);
+    }
+
+    /**
+     * Get a decimal value via a mathematical expression.
+     *
+     * @param path The key to fetch the value from.
+     * @return The computed value, or 0 if not found or invalid.
+     */
+    default double getDoubleFromExpression(@NotNull String path) {
+        return getDoubleFromExpression(path, null);
+    }
+
+    /**
+     * Get a decimal value via a mathematical expression.
+     *
+     * @param path   The key to fetch the value from.
+     * @param player The player to evaluate placeholders with respect to.
+     * @return The computed value, or 0 if not found or invalid.
+     */
+    default double getDoubleFromExpression(@NotNull String path,
+                                           @Nullable Player player) {
+        return NumberUtils.evaluateExpression(this.getString(path), player, this);
+    }
+
+    /**
+     * Get a decimal value via a mathematical expression.
+     *
+     * @param path   The key to fetch the value from.
+     * @param player The player to evaluate placeholders with respect to.
+     * @param additionalPlayers The additional players to evaluate placeholders with respect to.
+     * @return The computed value, or 0 if not found or invalid.
+     */
+    default double getDoubleFromExpression(@NotNull String path,
+                                           @Nullable Player player,
+                                           @NotNull Collection<AdditionalPlayer> additionalPlayers) {
+        return NumberUtils.evaluateExpression(this.getString(path), player, this, additionalPlayers);
+    }
+
+    /**
+     * Get a decimal from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    Double getDoubleOrNull(@NotNull String path);
+
+    /**
+     * Get a list of decimals from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    default List<Double> getDoubles(@NotNull String path) {
+        return Objects.requireNonNullElse(getDoublesOrNull(path), new ArrayList<>());
+    }
+
+    /**
+     * Get a list of decimals from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    List<Double> getDoublesOrNull(@NotNull String path);
+
+    /**
+     * Get a list of subsections from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    default List<? extends Config> getSubsections(@NotNull String path) {
+        return Objects.requireNonNullElse(getSubsectionsOrNull(path), new ArrayList<>());
+    }
+
+    /**
+     * Get a list of subsections from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    List<? extends Config> getSubsectionsOrNull(@NotNull String path);
+
+    /**
+     * Get config type.
+     *
+     * @return The type.
+     */
+    @NotNull
+    ConfigType getType();
+
+    /**
+     * Clone the config.
+     *
+     * @return The clone.
+     */
+    Config clone();
+
+    @Override
+    default void addInjectablePlaceholder(@NotNull Iterable<InjectablePlaceholder> placeholders) {
+        // Do nothing.
+    }
+
+    @Override
+    default @NotNull List<InjectablePlaceholder> getPlaceholderInjections() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    default void clearInjectedPlaceholders() {
+        // Do nothing.
+    }
+
+    /**
+     * Convert the config to a map of values.
+     *
+     * @return The values.
+     */
+    default Map<String, Object> toMap() {
+        return new HashMap<>();
+    }
+
+    /**
+     * Convert the config to a map of values.
+     *
+     * @return The values.
+     */
+    default ConfigurationSection toBukkit() {
+        YamlConfiguration empty = new YamlConfiguration();
+        empty.createSection("temp", this.toMap());
+        return empty.getConfigurationSection("temp");
+    }
+
+    /**
+     * Create a new config builder.
+     *
+     * @return The builder.
+     */
+    static BuildableConfig builder() {
+        return new BuildableConfig();
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/LoadableConfig.java

@@ -0,0 +1,67 @@
+package com.willfp.eco.core.config.interfaces;
+
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * Interface for configs that physically exist as files in plugins.
+ */
+public interface LoadableConfig extends Config {
+    /**
+     * Create the file.
+     */
+    void createFile();
+
+    /**
+     * Get resource path as relative to base directory.
+     *
+     * @return The resource path.
+     */
+    String getResourcePath();
+
+    /**
+     * Save the config.
+     *
+     * @throws IOException If error in saving.
+     */
+    void save() throws IOException;
+
+    /**
+     * Get the config file.
+     *
+     * @return The file.
+     */
+    File getConfigFile();
+
+    /**
+     * Get the config name (including extension).
+     *
+     * @return The name.
+     */
+    String getName();
+
+    /**
+     * Get bukkit {@link YamlConfiguration}.
+     * <p>
+     * This used to represent the underlying config, but since 6.30.0 configs use
+     * their own implementations internally, without relying on bukkit.
+     *
+     * @return The config, or null if config is not yaml-based.
+     * @deprecated Use toBukkit() instead.
+     */
+    @Nullable
+    @Deprecated(since = "6.30.0", forRemoval = true)
+    default YamlConfiguration getBukkitHandle() {
+        return this.toBukkit();
+    }
+
+    /**
+     * Convert the config to a bukkit {@link YamlConfiguration}.
+     */
+    @NotNull
+    YamlConfiguration toBukkit();
+}

eco-api/src/main/java/com/willfp/eco/core/config/updating/ConfigHandler.java

@@ -0,0 +1,33 @@
+package com.willfp.eco.core.config.updating;
+
+import com.willfp.eco.core.config.interfaces.LoadableConfig;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Every {@link com.willfp.eco.core.PluginLike} has a config handler.
+ * <p>
+ * Handles updating and saving configs.
+ */
+public interface ConfigHandler {
+    /**
+     * Invoke all update methods.
+     */
+    void callUpdate();
+
+    /**
+     * Save all configs.
+     */
+    void saveAllConfigs();
+
+    /**
+     * Update all updatable configs.
+     */
+    void updateConfigs();
+
+    /**
+     * Add new config to be saved.
+     *
+     * @param config The config.
+     */
+    void addConfig(@NotNull LoadableConfig config);
+}

eco-api/src/main/java/com/willfp/eco/core/config/updating/ConfigUpdater.java

@@ -0,0 +1,46 @@
+package com.willfp.eco.core.config.updating;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation to put on update methods.
+ * <p>
+ * All update methods must be public and static,
+ * and can accept an EcoPlugin as a parameter.
+ * <p>
+ * As such, there are only 2 valid update methods:
+ * <p>
+ * The first:
+ * <pre>{@code
+ * @ConfigUpdater
+ * public static void update() {
+ *     // Update code
+ * }
+ * }</pre>
+ * <p>
+ * The second:
+ * <pre>{@code
+ * public static void update(EcoPlugin plugin) {
+ *     // Update code
+ * }
+ * }</pre>
+ * <p>
+ * If using kotlin, you have to annotate the method with {@code @JvmStatic}
+ * in order to prevent null pointer exceptions - this also means that you cannot
+ * have config updater methods in companion objects.
+ * <p>
+ * Config update methods in all classes in a plugin jar will be called
+ * on reload.
+ * <p>
+ * By having a plugin as a parameter, you shouldn't really need getInstance()
+ * calls in your code.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+@Documented
+public @interface ConfigUpdater {
+}

eco-api/src/main/java/com/willfp/eco/core/config/wrapper/ConfigFactory.java

@@ -0,0 +1,87 @@
+package com.willfp.eco.core.config.wrapper;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.ConfigType;
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.config.interfaces.LoadableConfig;
+import org.bukkit.configuration.ConfigurationSection;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Map;
+
+/**
+ * Internal component to create backend config implementations.
+ */
+@ApiStatus.Internal
+@Eco.HandlerComponent
+public interface ConfigFactory {
+    /**
+     * Updatable config.
+     *
+     * @param configName            The name of the config
+     * @param plugin                The plugin.
+     * @param subDirectoryPath      The subdirectory path.
+     * @param source                The class that owns the resource.
+     * @param removeUnused          Whether keys not present in the default config should be removed on update.
+     * @param type                  The config type.
+     * @param updateBlacklist       Substring of keys to not add/remove keys for.
+     * @param requiresChangesToSave If the config must be changed in order to save the config.
+     * @return The config implementation.
+     */
+    LoadableConfig createUpdatableConfig(@NotNull String configName,
+                                         @NotNull PluginLike plugin,
+                                         @NotNull String subDirectoryPath,
+                                         @NotNull Class<?> source,
+                                         boolean removeUnused,
+                                         @NotNull ConfigType type,
+                                         boolean requiresChangesToSave,
+                                         @NotNull String... updateBlacklist);
+
+    /**
+     * Loadable config.
+     *
+     * @param configName            The name of the config
+     * @param plugin                The plugin.
+     * @param subDirectoryPath      The subdirectory path.
+     * @param source                The class that owns the resource.
+     * @param type                  The config type.
+     * @param requiresChangesToSave If the config must be changed in order to save the config.
+     * @return The config implementation.
+     */
+    LoadableConfig createLoadableConfig(@NotNull String configName,
+                                        @NotNull PluginLike plugin,
+                                        @NotNull String subDirectoryPath,
+                                        @NotNull Class<?> source,
+                                        @NotNull ConfigType type,
+                                        boolean requiresChangesToSave);
+
+    /**
+     * Create config.
+     *
+     * @param config The handle.
+     * @return The config implementation.
+     */
+    Config createConfig(@NotNull ConfigurationSection config);
+
+    /**
+     * Create config.
+     *
+     * @param values The values.
+     * @param type   The config type.
+     * @return The config implementation.
+     */
+    Config createConfig(@NotNull Map<String, Object> values,
+                        @NotNull ConfigType type);
+
+    /**
+     * Create config.
+     *
+     * @param contents The file contents.
+     * @param type     The type.
+     * @return The config implementation.
+     */
+    Config createConfig(@NotNull String contents,
+                        @NotNull ConfigType type);
+}

eco-api/src/main/java/com/willfp/eco/core/config/wrapper/ConfigWrapper.java

@@ -0,0 +1,175 @@
+package com.willfp.eco.core.config.wrapper;
+
+import com.willfp.eco.core.config.ConfigType;
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.placeholder.InjectablePlaceholder;
+import com.willfp.eco.util.StringUtils;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Configs from eco have an internal implementation,
+ * which is the handle.
+ * <p>
+ * This class handles them.
+ *
+ * @param <T> The type of the handle.
+ */
+@SuppressWarnings({"MethodDoesntCallSuperMethod", "removal"})
+public abstract class ConfigWrapper<T extends Config> implements Config {
+    /**
+     * Configs from eco have an internal implementation,
+     * which is the handle.
+     * <p>
+     * The handle should only ever be used if you want to
+     * do something <i>interesting</i> config-wise with some
+     * internals.
+     * <p>
+     * In general use, though, the handle isn't necessary.
+     */
+    private final T handle;
+
+    /**
+     * Create a config wrapper.
+     *
+     * @param handle The config that is being wrapped.
+     */
+    protected ConfigWrapper(@NotNull final T handle) {
+        this.handle = handle;
+    }
+
+    @Override
+    @Deprecated(since = "6.31.1", forRemoval = true)
+    public void clearCache() {
+        handle.clearCache();
+    }
+
+    @Override
+    public String toPlaintext() {
+        return handle.toPlaintext();
+    }
+
+    @Override
+    public boolean has(@NotNull final String path) {
+        return handle.has(path);
+    }
+
+    @Override
+    public @NotNull List<String> getKeys(final boolean deep) {
+        return handle.getKeys(deep);
+    }
+
+    @Override
+    public @NotNull List<String> recurseKeys(@NotNull final Set<String> found,
+                                             @NotNull final String root) {
+        return handle.recurseKeys(found, root);
+    }
+
+    @Override
+    public @Nullable Object get(@NotNull final String path) {
+        return handle.get(path);
+    }
+
+    @Override
+    public void set(@NotNull final String path,
+                    @Nullable final Object object) {
+        handle.set(path, object);
+    }
+
+    @Override
+    public @Nullable Config getSubsectionOrNull(@NotNull final String path) {
+        return handle.getSubsectionOrNull(path);
+    }
+
+    @Override
+    public @Nullable Integer getIntOrNull(@NotNull final String path) {
+        return handle.getIntOrNull(path);
+    }
+
+    @Override
+    public @Nullable List<Integer> getIntsOrNull(@NotNull final String path) {
+        return handle.getIntsOrNull(path);
+    }
+
+    @Override
+    public @Nullable Boolean getBoolOrNull(@NotNull final String path) {
+        return handle.getBoolOrNull(path);
+    }
+
+    @Override
+    public @Nullable List<Boolean> getBoolsOrNull(@NotNull final String path) {
+        return handle.getBoolsOrNull(path);
+    }
+
+    @Override
+    public @Nullable String getStringOrNull(@NotNull final String path,
+                                            final boolean format,
+                                            @NotNull final StringUtils.FormatOption option) {
+        return handle.getStringOrNull(path, format, option);
+    }
+
+    @Override
+    public @Nullable List<String> getStringsOrNull(@NotNull final String path,
+                                                   final boolean format,
+                                                   @NotNull final StringUtils.FormatOption option) {
+        return handle.getStringsOrNull(path, format, option);
+    }
+
+    @Override
+    public @Nullable Double getDoubleOrNull(@NotNull final String path) {
+        return handle.getDoubleOrNull(path);
+    }
+
+    @Override
+    public @Nullable List<Double> getDoublesOrNull(@NotNull final String path) {
+        return handle.getDoublesOrNull(path);
+    }
+
+    @Override
+    public @Nullable List<? extends Config> getSubsectionsOrNull(@NotNull final String path) {
+        return handle.getSubsectionsOrNull(path);
+    }
+
+    @Override
+    public Config clone() {
+        return handle.clone();
+    }
+
+    @Override
+    public @NotNull ConfigType getType() {
+        return handle.getType();
+    }
+
+    @Override
+    public void addInjectablePlaceholder(@NotNull final Iterable<InjectablePlaceholder> placeholders) {
+        handle.addInjectablePlaceholder(placeholders);
+    }
+
+    @Override
+    public @NotNull List<InjectablePlaceholder> getPlaceholderInjections() {
+        return handle.getPlaceholderInjections();
+    }
+
+    @Override
+    public void clearInjectedPlaceholders() {
+        handle.clearInjectedPlaceholders();
+    }
+
+    @Override
+    public Map<String, Object> toMap() {
+        return this.handle.toMap();
+    }
+
+    /**
+     * Get the handle.
+     *
+     * @return The handle.
+     */
+    public T getHandle() {
+        return this.handle;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/wrapper/LoadableConfigWrapper.java

@@ -0,0 +1,52 @@
+package com.willfp.eco.core.config.wrapper;
+
+import com.willfp.eco.core.config.interfaces.LoadableConfig;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * Wrapper to handle the backend loadable yaml config implementations.
+ */
+public abstract class LoadableConfigWrapper extends ConfigWrapper<LoadableConfig> implements LoadableConfig {
+    /**
+     * Create a config wrapper.
+     *
+     * @param handle The handle.
+     */
+    protected LoadableConfigWrapper(@NotNull final LoadableConfig handle) {
+        super(handle);
+    }
+
+    @Override
+    public void createFile() {
+        this.getHandle().createFile();
+    }
+
+    @Override
+    public String getResourcePath() {
+        return this.getHandle().getResourcePath();
+    }
+
+    @Override
+    public void save() throws IOException {
+        this.getHandle().save();
+    }
+
+    @Override
+    public File getConfigFile() {
+        return this.getHandle().getConfigFile();
+    }
+
+    @Override
+    public String getName() {
+        return this.getHandle().getName();
+    }
+
+    @Override
+    public @NotNull YamlConfiguration toBukkit() {
+        return this.getHandle().toBukkit();
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/ExtendedPersistentDataContainer.java

@@ -0,0 +1,101 @@
+package com.willfp.eco.core.data;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.persistence.PersistentDataContainer;
+import org.bukkit.persistence.PersistentDataType;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Set;
+
+/**
+ * Persistent data container wrapper that allows for full string (non-namespaced) keys.
+ */
+public interface ExtendedPersistentDataContainer {
+    /**
+     * Set a key.
+     *
+     * @param key      The key.
+     * @param dataType The data type.
+     * @param value    The value.
+     * @param <T>      The type.
+     * @param <Z>      The type.
+     */
+    <T, Z> void set(@NotNull String key, @NotNull PersistentDataType<T, Z> dataType, @NotNull Z value);
+
+    /**
+     * Get if there is a key.
+     *
+     * @param key      The key.
+     * @param dataType The data type.
+     * @param <T>      The type.
+     * @param <Z>      The type.
+     * @return If the key is present.
+     */
+    <T, Z> boolean has(@NotNull String key, @NotNull PersistentDataType<T, Z> dataType);
+
+    /**
+     * Get a value.
+     *
+     * @param key      The key.
+     * @param dataType The data type.
+     * @param <T>      The type.
+     * @param <Z>      The type.
+     * @return The value, or null if not found.
+     */
+    @Nullable <T, Z> Z get(@NotNull String key, @NotNull PersistentDataType<T, Z> dataType);
+
+    /**
+     * Get a value or default if not present.
+     *
+     * @param key          The key.
+     * @param dataType     The data type.
+     * @param defaultValue The default value.
+     * @param <T>          The type.
+     * @param <Z>          The type.
+     * @return The value, or the default if not found.
+     */
+    @NotNull <T, Z> Z getOrDefault(@NotNull String key, @NotNull PersistentDataType<T, Z> dataType, @NotNull Z defaultValue);
+
+    /**
+     * Get all keys, including namespaced keys.
+     *
+     * @return The keys.
+     */
+    @NotNull
+    Set<String> getAllKeys();
+
+    /**
+     * Remove a key.
+     *
+     * @param key The key.
+     */
+    void remove(@NotNull String key);
+
+    /**
+     * Get the base PDC.
+     *
+     * @return The base.
+     */
+    @NotNull
+    PersistentDataContainer getBase();
+
+    /**
+     * Get extension for PersistentDataContainers to add non-namespaced keys.
+     *
+     * @param base The base container.
+     * @return The extended container.
+     */
+    static ExtendedPersistentDataContainer extend(@NotNull PersistentDataContainer base) {
+        return Eco.getHandler().adaptPdc(base);
+    }
+
+    /**
+     * Create a new extended container.
+     *
+     * @return The extended container.
+     */
+    static ExtendedPersistentDataContainer create() {
+        return extend(Eco.getHandler().newPdc());
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/PlayerProfile.java

@@ -0,0 +1,36 @@
+package com.willfp.eco.core.data;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.OfflinePlayer;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.UUID;
+
+/**
+ * Persistent data storage interface for players.
+ * <p>
+ * Profiles save automatically, so there is no need to save after changes.
+ */
+public interface PlayerProfile extends Profile {
+    /**
+     * Load a player profile.
+     *
+     * @param player The player.
+     * @return The profile.
+     */
+    @NotNull
+    static PlayerProfile load(@NotNull final OfflinePlayer player) {
+        return load(player.getUniqueId());
+    }
+
+    /**
+     * Load a player profile.
+     *
+     * @param uuid The player's UUID.
+     * @return The profile.
+     */
+    @NotNull
+    static PlayerProfile load(@NotNull final UUID uuid) {
+        return Eco.getHandler().getProfileHandler().load(uuid);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/Profile.java

@@ -0,0 +1,30 @@
+package com.willfp.eco.core.data;
+
+import com.willfp.eco.core.data.keys.PersistentDataKey;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Persistent data storage interface.
+ * <p>
+ * Profiles save automatically, so there is no need to save after changes.
+ */
+public interface Profile {
+    /**
+     * Write a key to persistent data.
+     *
+     * @param key   The key.
+     * @param value The value.
+     * @param <T>   The type of the key.
+     */
+    <T> void write(@NotNull PersistentDataKey<T> key,
+                   @NotNull T value);
+
+    /**
+     * Read a key from persistent data.
+     *
+     * @param key The key.
+     * @param <T> The type of the key.
+     * @return The value, or the default value if not found.
+     */
+    <T> @NotNull T read(@NotNull PersistentDataKey<T> key);
+}

eco-api/src/main/java/com/willfp/eco/core/data/ProfileHandler.java

@@ -0,0 +1,94 @@
+package com.willfp.eco.core.data;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.data.keys.PersistentDataKey;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * API to handle profiles.
+ */
+@ApiStatus.Internal
+@Eco.HandlerComponent
+public interface ProfileHandler {
+    /**
+     * Load a player profile.
+     *
+     * @param uuid The UUID.
+     * @return The profile.
+     */
+    PlayerProfile load(@NotNull UUID uuid);
+
+    /**
+     * Load the server profile.
+     *
+     * @return The profile.
+     */
+    ServerProfile loadServerProfile();
+
+    /**
+     * Unload a player profile from memory.
+     * <p>
+     * This will not save the profile first.
+     *
+     * @param uuid The uuid.
+     */
+    void unloadPlayer(@NotNull UUID uuid);
+
+    /**
+     * Save a player profile.
+     * <p>
+     * Can run async if using MySQL.
+     *
+     * @param uuid The uuid.
+     * @deprecated Saving changes is faster and should be used. Saving a player manually is not recommended.
+     */
+    @Deprecated
+    default void savePlayer(@NotNull UUID uuid) {
+        this.saveKeysFor(uuid, PersistentDataKey.values());
+    }
+
+    /**
+     * Save keys for a player.
+     * <p>
+     * Can run async if using MySQL.
+     *
+     * @param uuid The uuid.
+     * @param keys The keys.
+     */
+    void saveKeysFor(@NotNull UUID uuid,
+                     @NotNull Set<PersistentDataKey<?>> keys);
+
+    /**
+     * Save all player data.
+     *
+     * @param async If the saving should be done asynchronously.
+     * @deprecated async is now handled automatically depending on implementation.
+     */
+    @Deprecated(forRemoval = true)
+    default void saveAll(boolean async) {
+        saveAll();
+    }
+
+    /**
+     * Save all player data.
+     * <p>
+     * Can run async if using MySQL.
+     *
+     * @deprecated Never used.
+     */
+    @Deprecated(since = "6.36.0", forRemoval = true)
+    default void saveAll() {
+        // Do nothing.
+    }
+
+    /**
+     * Commit all changes to the file.
+     * <p>
+     * Does nothing if using MySQL.
+     */
+    void save();
+}

eco-api/src/main/java/com/willfp/eco/core/data/ServerProfile.java

@@ -0,0 +1,21 @@
+package com.willfp.eco.core.data;
+
+import com.willfp.eco.core.Eco;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Persistent data storage interface for servers.
+ * <p>
+ * Profiles save automatically, so there is no need to save after changes.
+ */
+public interface ServerProfile extends Profile {
+    /**
+     * Load the server profile.
+     *
+     * @return The profile.
+     */
+    @NotNull
+    static ServerProfile load() {
+        return Eco.getHandler().getProfileHandler().loadServerProfile();
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/keys/KeyRegistry.java

@@ -0,0 +1,39 @@
+package com.willfp.eco.core.data.keys;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.NamespacedKey;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Set;
+
+/**
+ * API to register persistent data keys.
+ */
+@ApiStatus.Internal
+@Eco.HandlerComponent
+public interface KeyRegistry {
+    /**
+     * Register a persistent data key to be stored.
+     *
+     * @param key The key.
+     */
+    void registerKey(@NotNull PersistentDataKey<?> key);
+
+    /**
+     * Get all registered keys.
+     *
+     * @return The keys.
+     */
+    Set<PersistentDataKey<?>> getRegisteredKeys();
+
+    /**
+     * Get persistent data key from namespaced key.
+     *
+     * @param namespacedKey The key.
+     * @return The key, or null if not found.
+     */
+    @Nullable
+    PersistentDataKey<?> getKeyFrom(@NotNull NamespacedKey namespacedKey);
+}

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKey.java

@@ -0,0 +1,147 @@
+package com.willfp.eco.core.data.keys;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.NamespacedKey;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * A persistent data key is a key with a type that can be stored about an offline player.
+ *
+ * @param <T> The type of the data.
+ */
+public final class PersistentDataKey<T> {
+    /**
+     * The key of the persistent data value.
+     */
+    private final NamespacedKey key;
+
+    /**
+     * The default value for the key.
+     */
+    private final T defaultValue;
+
+    /**
+     * The persistent data key type.
+     */
+    private final PersistentDataKeyType<T> type;
+
+    /**
+     * Create a new Persistent Data Key.
+     *
+     * @param key          The key.
+     * @param type         The data type.
+     * @param defaultValue The default value.
+     */
+    public PersistentDataKey(@NotNull final NamespacedKey key,
+                             @NotNull final PersistentDataKeyType<T> type,
+                             @NotNull final T defaultValue) {
+        this.key = key;
+        this.defaultValue = defaultValue;
+        this.type = type;
+
+        Eco.getHandler().getKeyRegistry().registerKey(this);
+    }
+
+    @Override
+    public String toString() {
+        return "PersistentDataKey{"
+                + "key=" + key
+                + ", defaultValue=" + defaultValue
+                + ", type=" + type
+                + '}';
+    }
+
+    /**
+     * Get the key.
+     *
+     * @return The key.
+     */
+    public NamespacedKey getKey() {
+        return this.key;
+    }
+
+    /**
+     * Get the default value.
+     *
+     * @return The default value.
+     */
+    public T getDefaultValue() {
+        return this.defaultValue;
+    }
+
+    /**
+     * Get the data key type.
+     *
+     * @return The key type.
+     */
+    public PersistentDataKeyType<T> getType() {
+        return this.type;
+    }
+
+    /**
+     * In older eco versions, keys would have to be categorized in order
+     * to register the columns in the MySQL database. This is no longer needed.
+     * <p>
+     * Old description is below:
+     * <p>
+     * Categorize key as a server key, will register new column to MySQL
+     * database immediately rather than waiting for auto-categorization.
+     * <p>
+     * This will improve performance.
+     *
+     * @return The key.
+     * @deprecated Not required since the new MySQL data handler was introduced.
+     */
+    @Deprecated(since = "6.40.0", forRemoval = true)
+    public PersistentDataKey<T> server() {
+        return this;
+    }
+
+    /**
+     * In older eco versions, keys would have to be categorized in order
+     * to register the columns in the MySQL database. This is no longer needed.
+     * <p>
+     * Old description is below:
+     * <p>
+     * Categorize key as a player key, will register new column to MySQL
+     * database immediately rather than waiting for auto-categorization.
+     * <p>
+     * This will improve performance.
+     *
+     * @return The key.
+     * @deprecated Not required since the new MySQL data handler was introduced.
+     */
+    @Deprecated(since = "6.40.0", forRemoval = true)
+    public PersistentDataKey<T> player() {
+        return this;
+    }
+
+    /**
+     * Get all persistent data keys.
+     *
+     * @return The keys.
+     */
+    public static Set<PersistentDataKey<?>> values() {
+        return Eco.getHandler().getKeyRegistry().getRegisteredKeys();
+    }
+
+    @Override
+    public boolean equals(@Nullable final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof PersistentDataKey that)) {
+            return false;
+        }
+        return Objects.equals(this.getKey(), that.getKey());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.getKey());
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKeyType.java

@@ -0,0 +1,133 @@
+package com.willfp.eco.core.data.keys;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * All storable data key types.
+ *
+ * @param <T> The type.
+ */
+public final class PersistentDataKeyType<T> {
+    /**
+     * The registered key types.
+     */
+    private static final List<PersistentDataKeyType<?>> VALUES = new ArrayList<>();
+
+    /**
+     * String.
+     */
+    public static final PersistentDataKeyType<String> STRING = new PersistentDataKeyType<>(String.class, "STRING");
+
+    /**
+     * Boolean.
+     */
+    public static final PersistentDataKeyType<Boolean> BOOLEAN = new PersistentDataKeyType<>(Boolean.class, "BOOLEAN");
+
+    /**
+     * Int.
+     */
+    public static final PersistentDataKeyType<Integer> INT = new PersistentDataKeyType<>(Integer.class, "INT");
+
+    /**
+     * Double.
+     */
+    public static final PersistentDataKeyType<Double> DOUBLE = new PersistentDataKeyType<>(Double.class, "DOUBLE");
+
+    /**
+     * String List.
+     */
+    public static final PersistentDataKeyType<List<String>> STRING_LIST = new PersistentDataKeyType<>(null, "STRING_LIST");
+
+    /**
+     * The class of the type.
+     */
+    private final Class<T> typeClass;
+
+    /**
+     * The name of the key type.
+     */
+    private final String name;
+
+    /**
+     * Get the class of the type.
+     *
+     * @return The class.
+     * @deprecated String list type will return null.
+     */
+    @Deprecated(since = "6.36.0", forRemoval = true)
+    @Nullable
+    public Class<T> getTypeClass() {
+        return typeClass;
+    }
+
+    /**
+     * Get the name of the key type.
+     *
+     * @return The name.
+     */
+    public String name() {
+        return name;
+    }
+
+    /**
+     * Create new PersistentDataKeyType.
+     *
+     * @param typeClass The type class.
+     * @param name      The name.
+     */
+    private PersistentDataKeyType(@Nullable final Class<T> typeClass,
+                                  @NotNull final String name) {
+        VALUES.add(this);
+
+        this.typeClass = typeClass;
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(@Nullable final Object that) {
+        if (this == that) {
+            return true;
+        }
+        if (!(that instanceof PersistentDataKeyType type)) {
+            return false;
+        }
+        return Objects.equals(this.name, type.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.name);
+    }
+
+    /**
+     * Get all registered {@link PersistentDataKeyType}s.
+     *
+     * @return The registered types.
+     */
+    @NotNull
+    public static PersistentDataKeyType<?>[] values() {
+        return VALUES.toArray(new PersistentDataKeyType[0]);
+    }
+
+    /**
+     * Get a key type from a name.
+     *
+     * @param name The name.
+     * @return The type, or null if not found.
+     */
+    @Nullable
+    public static PersistentDataKeyType<?> valueOf(@NotNull final String name) {
+        for (PersistentDataKeyType<?> type : VALUES) {
+            if (type.name.equalsIgnoreCase(name)) {
+                return type;
+            }
+        }
+
+        return null;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/display/Display.java

@@ -0,0 +1,135 @@
+package com.willfp.eco.core.display;
+
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Utility class to manage client-side item display.
+ */
+public final class Display {
+    /**
+     * The prefix for client-side lore lines.
+     */
+    public static final String PREFIX = "§z";
+
+    /**
+     * The display handler.
+     */
+    private static DisplayHandler handler = null;
+
+    /**
+     * Display on ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    public static ItemStack display(@NotNull final ItemStack itemStack) {
+        return display(itemStack, null);
+    }
+
+    /**
+     * Display on ItemStacks.
+     *
+     * @param itemStack The item.
+     * @param player    The player.
+     * @return The ItemStack.
+     */
+    public static ItemStack display(@NotNull final ItemStack itemStack,
+                                    @Nullable final Player player) {
+        return handler.display(itemStack, player);
+    }
+
+    /**
+     * Display on ItemStacks and then finalize.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    public static ItemStack displayAndFinalize(@NotNull final ItemStack itemStack) {
+        return finalize(display(itemStack, null));
+    }
+
+    /**
+     * Display on ItemStacks and then finalize.
+     *
+     * @param itemStack The item.
+     * @param player    The player.
+     * @return The ItemStack.
+     */
+    public static ItemStack displayAndFinalize(@NotNull final ItemStack itemStack,
+                                               @Nullable final Player player) {
+        return finalize(display(itemStack, player));
+    }
+
+    /**
+     * Revert on ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    public static ItemStack revert(@NotNull final ItemStack itemStack) {
+        return handler.revert(itemStack);
+    }
+
+    /**
+     * Finalize an ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    public static ItemStack finalize(@NotNull final ItemStack itemStack) {
+        return handler.finalize(itemStack);
+    }
+
+    /**
+     * Unfinalize an ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    public static ItemStack unfinalize(@NotNull final ItemStack itemStack) {
+        return handler.unfinalize(itemStack);
+    }
+
+    /**
+     * If an item is finalized.
+     *
+     * @param itemStack The item.
+     * @return If finalized.
+     */
+    public static boolean isFinalized(@NotNull final ItemStack itemStack) {
+        return handler.isFinalized(itemStack);
+    }
+
+    /**
+     * Register a new display module.
+     *
+     * @param module The module.
+     */
+    public static void registerDisplayModule(@NotNull final DisplayModule module) {
+        handler.registerDisplayModule(module);
+    }
+
+    /**
+     * Set the display handler.
+     * <p>
+     * Internal API component, you will cause bugs if you create your own handler.
+     *
+     * @param handler The handler.
+     */
+    @ApiStatus.Internal
+    public static void setHandler(@NotNull final DisplayHandler handler) {
+        if (Display.handler != null) {
+            throw new IllegalStateException("Display already initialized!");
+        }
+
+        Display.handler = handler;
+    }
+
+    private Display() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/display/DisplayHandler.java

@@ -0,0 +1,64 @@
+package com.willfp.eco.core.display;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Interface for display implementations.
+ */
+@ApiStatus.Internal
+@Eco.HandlerComponent
+public interface DisplayHandler {
+    /**
+     * Register display module.
+     *
+     * @param module The module.
+     */
+    void registerDisplayModule(@NotNull DisplayModule module);
+
+    /**
+     * Display on ItemStacks.
+     *
+     * @param itemStack The item.
+     * @param player    The player.
+     * @return The ItemStack.
+     */
+    ItemStack display(@NotNull ItemStack itemStack,
+                      @Nullable Player player);
+
+    /**
+     * Revert on ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    ItemStack revert(@NotNull ItemStack itemStack);
+
+    /**
+     * Finalize an ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    ItemStack finalize(@NotNull ItemStack itemStack);
+
+    /**
+     * Unfinalize an ItemStacks.
+     *
+     * @param itemStack The item.
+     * @return The ItemStack.
+     */
+    ItemStack unfinalize(@NotNull ItemStack itemStack);
+
+    /**
+     * If an item is finalized.
+     *
+     * @param itemStack The item.
+     * @return If finalized.
+     */
+    boolean isFinalized(@NotNull ItemStack itemStack);
+}

eco-api/src/main/java/com/willfp/eco/core/display/DisplayModule.java

@@ -0,0 +1,135 @@
+package com.willfp.eco.core.display;
+
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginDependent;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Class for all plugin-specific client-side item display modules.
+ */
+public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
+    /**
+     * The priority of the module.
+     */
+    private final int weight;
+
+    /**
+     * Create a new display module.
+     *
+     * @param plugin   The plugin that the display is for.
+     * @param priority The priority of the module.
+     */
+    protected DisplayModule(@NotNull final EcoPlugin plugin,
+                            @NotNull final DisplayPriority priority) {
+        super(plugin);
+        this.weight = priority.getWeight();
+    }
+
+    /**
+     * Create a new display module.
+     *
+     * @param plugin The plugin that the display is for.
+     * @param weight The weight/priority of the module.
+     */
+    protected DisplayModule(@NotNull final EcoPlugin plugin,
+                            final int weight) {
+        super(plugin);
+        this.weight = weight;
+    }
+
+    /**
+     * Display an item.
+     *
+     * @param itemStack The item.
+     * @param args      Optional args for display.
+     */
+    public void display(@NotNull final ItemStack itemStack,
+                        @NotNull final Object... args) {
+        // Technically optional.
+    }
+
+    /**
+     * Display an item.
+     *
+     * @param itemStack The item.
+     * @param player    The player.
+     * @param args      Optional args for display.
+     */
+    public void display(@NotNull final ItemStack itemStack,
+                        @Nullable final Player player,
+                        @NotNull final Object... args) {
+        // Technically optional.
+    }
+
+    /**
+     * Display an item.
+     *
+     * @param itemStack  The item.
+     * @param player     The player.
+     * @param properties The properties.
+     * @param args       Optional args for display.
+     */
+    public void display(@NotNull final ItemStack itemStack,
+                        @Nullable final Player player,
+                        @NotNull final DisplayProperties properties,
+                        @NotNull final Object... args) {
+        // Technically optional.
+    }
+
+    /**
+     * Revert an item.
+     *
+     * @param itemStack The item.
+     */
+    public void revert(@NotNull final ItemStack itemStack) {
+        // Technically optional.
+    }
+
+    /**
+     * Create varargs to pass back to ItemStack after reverting, but before display.
+     *
+     * @param itemStack The itemStack.
+     * @return The plugin-specific varargs.
+     */
+    public Object[] generateVarArgs(@NotNull final ItemStack itemStack) {
+        return new Object[0];
+    }
+
+    /**
+     * Get name of plugin.
+     *
+     * @return The plugin name.
+     */
+    public final String getPluginName() {
+        return super.getPlugin().getName();
+    }
+
+    /**
+     * Get the display priority.
+     *
+     * @return The priority.
+     * @deprecated Use getWeight instead.
+     */
+    @Deprecated(since = "6.35.0", forRemoval = true)
+    public DisplayPriority getPriority() {
+        return switch (this.weight) {
+            case 100 -> DisplayPriority.LOWEST;
+            case 200 -> DisplayPriority.LOW;
+            case 300 -> DisplayPriority.HIGH;
+            case 400 -> DisplayPriority.HIGHEST;
+            default -> DisplayPriority.CUSTOM;
+        };
+    }
+
+    /**
+     * Get the display weight.
+     *
+     * @return The weight.
+     */
+    public int getWeight() {
+        return this.weight;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/display/DisplayPriority.java

@@ -0,0 +1,54 @@
+package com.willfp.eco.core.display;
+
+/**
+ * The priority (order) of display modules.
+ */
+public enum DisplayPriority {
+    /**
+     * Custom weight.
+     */
+    CUSTOM(250),
+
+    /**
+     * Ran first.
+     */
+    LOWEST(100),
+
+    /**
+     * Ran second.
+     */
+    LOW(200),
+
+    /**
+     * Ran third.
+     */
+    HIGH(300),
+
+    /**
+     * Ran last.
+     */
+    HIGHEST(400);
+
+    /**
+     * The display priority weight.
+     */
+    private final int weight;
+
+    /**
+     * Create new display priority.
+     *
+     * @param weight The weight.
+     */
+    DisplayPriority(final int weight) {
+        this.weight = weight;
+    }
+
+    /**
+     * Get the weight.
+     *
+     * @return The weight.
+     */
+    public int getWeight() {
+        return weight;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/display/DisplayProperties.java

@@ -0,0 +1,18 @@
+package com.willfp.eco.core.display;
+
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Extra properties passed into {@link DisplayModule}.
+ *
+ * @param inInventory  If the item was in an inventory.
+ * @param inGui        If the item is assumed to be in a gui. (Not perfectly accurate).
+ * @param originalItem The original item, not to be modified.
+ */
+public record DisplayProperties(
+        boolean inInventory,
+        boolean inGui,
+        @NotNull ItemStack originalItem
+) {
+}

eco-api/src/main/java/com/willfp/eco/core/drops/DropQueue.java

@@ -1,10 +1,6 @@
-package com.willfp.eco.util.drops;
+package com.willfp.eco.core.drops;
 
-import com.willfp.eco.util.drops.internal.AbstractDropQueue;
-import com.willfp.eco.util.drops.internal.DropManager;
-import com.willfp.eco.util.drops.internal.DropQueueType;
-import com.willfp.eco.util.drops.internal.FastCollatedDropQueue;
-import com.willfp.eco.util.drops.internal.InternalDropQueue;
+import com.willfp.eco.core.Eco;
 import org.bukkit.Location;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
@@ -12,21 +8,26 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.Collection;
 
-public class DropQueue {
 /**
-     * The internally used {@link AbstractDropQueue}.
-     */
-    private final AbstractDropQueue handle;
-
-    /**
-     * Create {@link DropQueue} linked to player.
+ * A {@link DropQueue} is a set of drops linked to player.
  * <p>
  * All drops should be passed through a drop queue for telekinesis integration.
+ * <p>
+ * It functions essentially as a builder class, and runs very quickly.
  *
+ * @see com.willfp.eco.util.TelekinesisUtils
+ */
+public class DropQueue {
+    /**
+     * The internally used {@link DropQueue}.
+     */
+    private final InternalDropQueue handle;
+
+    /**
      * @param player The player.
      */
     public DropQueue(@NotNull final Player player) {
-        handle = DropManager.getType() == DropQueueType.COLLATED ? new FastCollatedDropQueue(player) : new InternalDropQueue(player);
+        handle = Eco.getHandler().getDropQueueFactory().create(player);
     }
 
     /**

eco-api/src/main/java/com/willfp/eco/core/drops/DropQueueFactory.java

@@ -0,0 +1,21 @@
+package com.willfp.eco.core.drops;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Internal component to create backend DropQueue implementations.
+ */
+@ApiStatus.Internal
+@Eco.HandlerComponent
+public interface DropQueueFactory {
+    /**
+     * Create a DropQueue.
+     *
+     * @param player The player.
+     * @return The Queue.
+     */
+    InternalDropQueue create(@NotNull Player player);
+}

eco-api/src/main/java/com/willfp/eco/core/drops/InternalDropQueue.java

@@ -1,19 +1,26 @@
-package com.willfp.eco.util.drops.internal;
+package com.willfp.eco.core.drops;
 
+import com.willfp.eco.core.Eco;
 import org.bukkit.Location;
 import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.Collection;
 
-public interface AbstractDropQueue {
+/**
+ * Internal interface for backend DropQueue implementations.
+ */
+@ApiStatus.Internal
+@Eco.HandlerComponent
+public interface InternalDropQueue {
     /**
      * Add item to queue.
      *
      * @param item The item to add.
      * @return The DropQueue.
      */
-    AbstractDropQueue addItem(@NotNull ItemStack item);
+    InternalDropQueue addItem(@NotNull ItemStack item);
 
     /**
      * Add multiple items to queue.
@@ -21,7 +28,7 @@ public interface AbstractDropQueue {
      * @param itemStacks The items to add.
      * @return The DropQueue.
      */
-    AbstractDropQueue addItems(@NotNull Collection<ItemStack> itemStacks);
+    InternalDropQueue addItems(@NotNull Collection<ItemStack> itemStacks);
 
     /**
      * Add xp to queue.
@@ -29,7 +36,7 @@ public interface AbstractDropQueue {
      * @param amount The amount to add.
      * @return The DropQueue.
      */
-    AbstractDropQueue addXP(int amount);
+    InternalDropQueue addXP(int amount);
 
     /**
      * Set location of the origin of the drops.
@@ -37,14 +44,14 @@ public interface AbstractDropQueue {
      * @param location The location.
      * @return The DropQueue.
      */
-    AbstractDropQueue setLocation(@NotNull Location location);
+    InternalDropQueue setLocation(@NotNull Location location);
 
     /**
      * Force the queue to act as if player is telekinetic.
      *
      * @return The DropQueue.
      */
-    AbstractDropQueue forceTelekinesis();
+    InternalDropQueue forceTelekinesis();
 
     /**
      * Push the queue.

eco-api/src/main/java/com/willfp/eco/core/entities/CustomEntity.java

@@ -0,0 +1,84 @@
+package com.willfp.eco.core.entities;
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.Location;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Entity;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.function.Function;
+import java.util.function.Predicate;
+
+/**
+ * A custom entity has 3 components.
+ *
+ * <ul>
+ *     <li>The key to identify it</li>
+ *     <li>The test to check if any entity is this custom entity</li>
+ *     <li>The supplier to spawn the custom {@link org.bukkit.entity.Entity}</li>
+ * </ul>
+ */
+public class CustomEntity implements TestableEntity {
+    /**
+     * The key.
+     */
+    private final NamespacedKey key;
+
+    /**
+     * The test for Entities to pass.
+     */
+    private final Predicate<@NotNull Entity> test;
+
+    /**
+     * The provider to spawn the entity.
+     */
+    private final Function<Location, Entity> provider;
+
+    /**
+     * Create a new custom entity.
+     *
+     * @param key      The entity key.
+     * @param test     The test.
+     * @param provider The provider to spawn the entity.
+     */
+    public CustomEntity(@NotNull final NamespacedKey key,
+                        @NotNull final Predicate<@NotNull Entity> test,
+                        @NotNull final Function<Location, Entity> provider) {
+        this.key = key;
+        this.test = test;
+        this.provider = provider;
+    }
+
+    @Override
+    public boolean matches(@Nullable final Entity entity) {
+        if (entity == null) {
+            return false;
+        }
+
+        return test.test(entity);
+    }
+
+    @Override
+    public Entity spawn(@NotNull final Location location) {
+        Validate.notNull(location.getWorld());
+
+        return provider.apply(location);
+    }
+
+    /**
+     * Register the entity.
+     */
+    public void register() {
+        Entities.registerCustomEntity(this.getKey(), this);
+    }
+
+    /**
+     * Get the key.
+     *
+     * @return The key.
+     */
+    public NamespacedKey getKey() {
+        return this.key;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/DummyEntity.java

@@ -0,0 +1,10 @@
+package com.willfp.eco.core.entities;
+
+import org.bukkit.entity.Entity;
+
+/**
+ * Interface for Dummy Entities in order to filter them using instanceof.
+ */
+public interface DummyEntity extends Entity {
+
+}

eco-api/src/main/java/com/willfp/eco/core/entities/Entities.java

@@ -0,0 +1,232 @@
+package com.willfp.eco.core.entities;
+
+import com.willfp.eco.core.entities.args.EntityArgParseResult;
+import com.willfp.eco.core.entities.args.EntityArgParser;
+import com.willfp.eco.core.entities.impl.EmptyTestableEntity;
+import com.willfp.eco.core.entities.impl.ModifiedTestableEntity;
+import com.willfp.eco.core.entities.impl.SimpleTestableEntity;
+import com.willfp.eco.util.NamespacedKeyUtils;
+import org.bukkit.Location;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Function;
+
+/**
+ * Class to manage all custom and vanilla entities.
+ */
+public final class Entities {
+    /**
+     * All entities.
+     */
+    private static final Map<NamespacedKey, TestableEntity> REGISTRY = new ConcurrentHashMap<>();
+
+    /**
+     * All entity parsers.
+     */
+    private static final List<EntityArgParser> ARG_PARSERS = new ArrayList<>();
+
+    /**
+     * The lookup handler.
+     */
+    private static final EntitiesLookupHandler ENTITIES_LOOKUP_HANDLER = new EntitiesLookupHandler(Entities::doParse);
+
+    /**
+     * Register a new custom item.
+     *
+     * @param key  The key of the item.
+     * @param item The item.
+     */
+    public static void registerCustomEntity(@NotNull final NamespacedKey key,
+                                            @NotNull final TestableEntity item) {
+        REGISTRY.put(key, item);
+    }
+
+    /**
+     * Register a new arg parser.
+     *
+     * @param parser The parser.
+     */
+    public static void registerArgParser(@NotNull final EntityArgParser parser) {
+        ARG_PARSERS.add(parser);
+    }
+
+    /**
+     * Remove an entity.
+     *
+     * @param key The key of the entity.
+     */
+    public static void removeCustomEntity(@NotNull final NamespacedKey key) {
+        REGISTRY.remove(key);
+    }
+
+    /**
+     * This is the backbone of the entire eco entity system.
+     * <p>
+     * You can look up a TestableEntity for any type or custom entity,
+     * and it will return it with any modifiers passed as parameters.
+     * <p>
+     * If you want to get an Entity instance from this, then just call
+     * {@link TestableEntity#spawn(Location)}.
+     * <p>
+     * The advantages of the testable entity system are that there is the inbuilt
+     * {@link TestableEntity#matches(Entity)} - this allows to check if any entity
+     * is that testable entity; which may sound negligible, but actually it allows for
+     * much more power and flexibility. For example, you can have an entity with an
+     * extra metadata tag, extra lore lines, different display name - and it
+     * will still work as long as the test passes.
+     *
+     * @param key The lookup string.
+     * @return The testable entity, or an empty testable entity if not found.
+     */
+    @NotNull
+    public static TestableEntity lookup(@NotNull final String key) {
+        return ENTITIES_LOOKUP_HANDLER.parseKey(key);
+    }
+
+    @NotNull
+    private static TestableEntity doParse(@NotNull final String[] args) {
+        if (args.length == 0) {
+            return new EmptyTestableEntity();
+        }
+
+        TestableEntity entity;
+
+        String[] split = args[0].toLowerCase().split(":");
+
+        if (split.length == 1) {
+            EntityType type;
+            try {
+                type = EntityType.valueOf(args[0].toUpperCase());
+            } catch (IllegalArgumentException e) {
+                return new EmptyTestableEntity();
+            }
+            entity = new SimpleTestableEntity(type);
+        } else {
+            String namespace = split[0];
+            String keyID = split[1];
+            NamespacedKey namespacedKey = NamespacedKeyUtils.create(namespace, keyID);
+
+            TestableEntity part = REGISTRY.get(namespacedKey);
+
+            if (part == null) {
+                return new EmptyTestableEntity();
+            }
+
+            entity = part;
+        }
+
+        String[] modifierArgs = Arrays.copyOfRange(args, 1, args.length);
+
+        List<EntityArgParseResult> parseResults = new ArrayList<>();
+
+        for (EntityArgParser argParser : ARG_PARSERS) {
+            EntityArgParseResult result = argParser.parseArguments(modifierArgs);
+            if (result != null) {
+                parseResults.add(result);
+            }
+        }
+
+        Function<Location, Entity> spawner = entity::spawn;
+
+        if (!parseResults.isEmpty()) {
+            entity = new ModifiedTestableEntity(
+                    entity,
+                    test -> {
+                        for (EntityArgParseResult parseResult : parseResults) {
+                            if (!parseResult.test().test(test)) {
+                                return false;
+                            }
+                        }
+
+                        return true;
+                    },
+                    location -> {
+                        Entity spawned = spawner.apply(location);
+
+                        for (EntityArgParseResult parseResult : parseResults) {
+                            parseResult.modifier().accept(spawned);
+                        }
+
+                        return spawned;
+                    }
+            );
+        }
+
+        return entity;
+    }
+
+    /**
+     * Get a Testable Entity from an ItemStack.
+     * <p>
+     * Will search for registered entity first. If there are no matches in the registry,
+     * then it will return a {@link com.willfp.eco.core.entities.impl.SimpleTestableEntity} matching the entity type.
+     * <p>
+     * If the entity is not custom and has unknown type, this will return null.
+     *
+     * @param entity The Entity.
+     * @return The found Testable Entity.
+     */
+    @Nullable
+    public static TestableEntity getEntity(@Nullable final Entity entity) {
+        if (entity == null) {
+            return null;
+        }
+
+        TestableEntity customEntity = getEntity(entity);
+
+        if (customEntity != null) {
+            return customEntity;
+        }
+
+        for (TestableEntity known : REGISTRY.values()) {
+            if (known.matches(entity)) {
+                return known;
+            }
+        }
+
+        if (entity.getType() == EntityType.UNKNOWN) {
+            return null;
+        }
+
+        return new SimpleTestableEntity(entity.getType());
+    }
+
+    /**
+     * Get if entity is a custom entity.
+     *
+     * @param entity The entity to check.
+     * @return If is custom.
+     */
+    public static boolean isCustomEntity(@NotNull final Entity entity) {
+        for (TestableEntity testable : REGISTRY.values()) {
+            if (testable.matches(entity)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Get all registered custom items.
+     *
+     * @return A set of all items.
+     */
+    public static Set<TestableEntity> getCustomEntities() {
+        return new HashSet<>(REGISTRY.values());
+    }
+
+    private Entities() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/EntitiesLookupHandler.java

@@ -0,0 +1,48 @@
+package com.willfp.eco.core.entities;
+
+import com.willfp.eco.core.entities.impl.EmptyTestableEntity;
+import com.willfp.eco.core.entities.impl.GroupedTestableEntities;
+import com.willfp.eco.core.lookup.LookupHandler;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collection;
+import java.util.function.Function;
+
+/**
+ * Handle item lookup strings.
+ */
+public class EntitiesLookupHandler implements LookupHandler<TestableEntity> {
+    /**
+     * The parser.
+     */
+    private final Function<String[], @NotNull TestableEntity> parser;
+
+    /**
+     * Create new lookup handler.
+     *
+     * @param parser The parser.
+     */
+    public EntitiesLookupHandler(@NotNull final Function<String[], @NotNull TestableEntity> parser) {
+        this.parser = parser;
+    }
+
+    @Override
+    public @NotNull TestableEntity parse(@NotNull final String[] args) {
+        return parser.apply(args);
+    }
+
+    @Override
+    public boolean validate(@NotNull final TestableEntity object) {
+        return !(object instanceof EmptyTestableEntity);
+    }
+
+    @Override
+    public @NotNull TestableEntity getFailsafe() {
+        return new EmptyTestableEntity();
+    }
+
+    @Override
+    public @NotNull TestableEntity join(@NotNull final Collection<TestableEntity> options) {
+        return new GroupedTestableEntities(options);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/TestableEntity.java

@@ -0,0 +1,29 @@
+package com.willfp.eco.core.entities;
+
+import com.willfp.eco.core.lookup.Testable;
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * An item with a test to see if any item is that item.
+ */
+public interface TestableEntity extends Testable<Entity> {
+    /**
+     * If an Entity matches the test.
+     *
+     * @param entity The entity to test.
+     * @return If the entity matches.
+     */
+    @Override
+    boolean matches(@Nullable Entity entity);
+
+    /**
+     * Spawn the entity.
+     *
+     * @param location The location.
+     * @return The entity.
+     */
+    Entity spawn(@NotNull Location location);
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/CustomGoal.java

@@ -0,0 +1,122 @@
+package com.willfp.eco.core.entities.ai;
+
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Base interface for all custom goals.
+ * <p>
+ * Can be used both for entity goals and target goals.
+ *
+ * @param <T> The type of mob that this goal can be applied to.
+ */
+public abstract class CustomGoal<T extends Mob> implements EntityGoal<T>, TargetGoal<T> {
+    /**
+     * The flags for the goal.
+     */
+    private final Set<GoalFlag> flags = EnumSet.noneOf(GoalFlag.class);
+
+    /**
+     * Initialize the goal with a mob.
+     * <p>
+     * This will be run before any implementation code, treat this as the constructor.
+     *
+     * @param mob The mob.
+     */
+    public abstract void initialize(@NotNull T mob);
+
+    /**
+     * Get if the goal can be used.
+     * Will start the goal if this returns true.
+     *
+     * @return If the goal can be used.
+     */
+    public abstract boolean canUse();
+
+    /**
+     * Tick the goal.
+     * <p>
+     * Runs ever tick as long as canUse returns true.
+     * <p>
+     * Runs after start().
+     */
+    public void tick() {
+        // Override when needed.
+    }
+
+    /**
+     * Start the goal.
+     * <p>
+     * Runs once canUse() returns true.
+     */
+    public void start() {
+        // Override when needed.
+    }
+
+    /**
+     * Stop the goal.
+     * <p>
+     * Runs once canUse() returns false.
+     */
+    public void stop() {
+        // Override when needed.
+    }
+
+    /**
+     * Get if the goal can continue to be used.
+     *
+     * @return If the goal can continue to be used.
+     */
+    public boolean canContinueToUse() {
+        return this.canUse();
+    }
+
+    /**
+     * Get if the goal is interruptable.
+     *
+     * @return If interruptable.
+     */
+    public boolean isInterruptable() {
+        return true;
+    }
+
+    /**
+     * Get the goal flags.
+     *
+     * @return The flags.
+     */
+    public EnumSet<GoalFlag> getFlags() {
+        return EnumSet.copyOf(this.flags);
+    }
+
+    /**
+     * Set the flags for the goal.
+     *
+     * @param flags The flags.
+     */
+    public final void setFlags(@NotNull final GoalFlag... flags) {
+        this.setFlags(EnumSet.copyOf(List.of(flags)));
+    }
+
+    /**
+     * Set the flags for the goal.
+     *
+     * @param flags The flags.
+     */
+    public void setFlags(@NotNull final EnumSet<GoalFlag> flags) {
+        this.flags.clear();
+        this.flags.addAll(flags);
+    }
+
+    @Override
+    public T addToEntity(@NotNull final T entity,
+                         final int priority) {
+        throw new UnsupportedOperationException(
+                "Shorthand syntax is not supported for custom goals by default as they can be both entity and target goals."
+        );
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/EntityController.java

@@ -0,0 +1,106 @@
+package com.willfp.eco.core.entities.ai;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * An entity controller allows for adding targets and goals to entities.
+ *
+ * @param <T> The wrapped mob.
+ */
+public interface EntityController<T extends Mob> {
+    /**
+     * Add a target goal to the entity.
+     * <p>
+     * Mutates the instance.
+     *
+     * @param priority The priority.
+     * @param goal     The goal.
+     * @return The entity controller.
+     */
+    EntityController<T> addTargetGoal(int priority,
+                                      @NotNull TargetGoal<? super T> goal);
+
+    /**
+     * Remove all target goals from the entity.
+     * <p>
+     * Mutates the instance.
+     *
+     * @return The entity controller.
+     */
+    EntityController<T> clearTargetGoals();
+
+    /**
+     * Remove a target goal from the entity.
+     * <p>
+     * Mutates the instance.
+     *
+     * @param goal The goal.
+     * @return The entity controller.
+     */
+    EntityController<T> removeTargetGoal(@NotNull TargetGoal<? super T> goal);
+
+    /**
+     * Add an entity goal to the entity.
+     * <p>
+     * Mutates the instance.
+     *
+     * @param priority The priority.
+     * @param goal     The goal.
+     * @return The entity controller.
+     */
+    EntityController<T> addEntityGoal(int priority,
+                                      @NotNull EntityGoal<? super T> goal);
+
+    /**
+     * Remove an entity goal from the entity.
+     * <p>
+     * Mutates the instance.
+     *
+     * @param goal The goal.
+     * @return The entity controller.
+     */
+    EntityController<T> removeEntityGoal(@NotNull EntityGoal<? super T> goal);
+
+    /**
+     * Remove all entity goals from the entity.
+     * <p>
+     * Mutates the instance.
+     *
+     * @return The entity controller.
+     */
+    EntityController<T> clearEntityGoals();
+
+    /**
+     * Remove all goals from the entity.
+     * <p>
+     * Mutates the instance.
+     *
+     * @return The entity controller.
+     */
+    default EntityController<T> clearAllGoals() {
+        this.clearTargetGoals();
+        return this.clearEntityGoals();
+    }
+
+    /**
+     * Get the mob back from the controlled entity.
+     * <p>
+     * Not required to apply changes, as the mob instance will be altered.
+     *
+     * @return The mob.
+     */
+    T getEntity();
+
+    /**
+     * Create an entity controller for an entity in order to modify targets and goals.
+     *
+     * @param entity The entity.
+     * @param <T>    The mob type.
+     * @return The entity controller.
+     */
+    static <T extends Mob> EntityController<T> getFor(@NotNull final T entity) {
+        return Eco.getHandler().createEntityController(entity);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/EntityGoal.java

@@ -0,0 +1,18 @@
+package com.willfp.eco.core.entities.ai;
+
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * A goal for entity AI.
+ *
+ * @param <T> The type of mob that the goal can be applied to.
+ */
+public interface EntityGoal<T extends Mob> extends Goal<T> {
+    @Override
+    default T addToEntity(@NotNull T entity, int priority) {
+        return EntityController.getFor(entity)
+                .addEntityGoal(priority, this)
+                .getEntity();
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/EntityGoals.java

@@ -0,0 +1,175 @@
+package com.willfp.eco.core.entities.ai;
+
+import com.google.common.collect.HashBiMap;
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalAvoidEntity;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalBreakDoors;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalBreatheAir;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalBreed;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalCatLieOnBed;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalCatSitOnBed;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalEatGrass;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalFleeSun;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalFloat;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalFollowBoats;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalFollowMobs;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalIllusionerBlindnessSpell;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalIllusionerMirrorSpell;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalInteract;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalLeapAtTarget;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalLookAtPlayer;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalMeleeAttack;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalMoveBackToVillage;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalMoveThroughVillage;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalMoveTowardsRestriction;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalMoveTowardsTarget;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalOcelotAttack;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalOpenDoors;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalPanic;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalRandomLookAround;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalRandomStroll;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalRandomSwimming;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalRangedAttack;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalRangedBowAttack;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalRangedCrossbowAttack;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalRestrictSun;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalStrollThroughVillage;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalTempt;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalTryFindWater;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalUseItem;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalWaterAvoidingRandomFlying;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalWaterAvoidingRandomStroll;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalWolfBeg;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Map;
+
+/**
+ * Class to manage entity goals.
+ */
+public final class EntityGoals {
+    /**
+     * All registered deserializers.
+     */
+    private static final Map<NamespacedKey, KeyedDeserializer<? extends EntityGoal<?>>> BY_KEY = HashBiMap.create();
+
+    static {
+        register(EntityGoalAvoidEntity.DESERIALIZER);
+        register(EntityGoalBreakDoors.DESERIALIZER);
+        register(EntityGoalBreatheAir.DESERIALIZER);
+        register(EntityGoalEatGrass.DESERIALIZER);
+        register(EntityGoalFleeSun.DESERIALIZER);
+        register(EntityGoalFloat.DESERIALIZER);
+        register(EntityGoalFollowBoats.DESERIALIZER);
+        register(EntityGoalFollowMobs.DESERIALIZER);
+        register(EntityGoalInteract.DESERIALIZER);
+        register(EntityGoalLeapAtTarget.DESERIALIZER);
+        register(EntityGoalLookAtPlayer.DESERIALIZER);
+        register(EntityGoalMeleeAttack.DESERIALIZER);
+        register(EntityGoalMoveBackToVillage.DESERIALIZER);
+        register(EntityGoalMoveThroughVillage.DESERIALIZER);
+        register(EntityGoalMoveTowardsRestriction.DESERIALIZER);
+        register(EntityGoalMoveTowardsTarget.DESERIALIZER);
+        register(EntityGoalOcelotAttack.DESERIALIZER);
+        register(EntityGoalOpenDoors.DESERIALIZER);
+        register(EntityGoalPanic.DESERIALIZER);
+        register(EntityGoalRandomLookAround.DESERIALIZER);
+        register(EntityGoalRandomStroll.DESERIALIZER);
+        register(EntityGoalRandomSwimming.DESERIALIZER);
+        register(EntityGoalRangedAttack.DESERIALIZER);
+        register(EntityGoalRangedBowAttack.DESERIALIZER);
+        register(EntityGoalRangedCrossbowAttack.DESERIALIZER);
+        register(EntityGoalRestrictSun.DESERIALIZER);
+        register(EntityGoalStrollThroughVillage.DESERIALIZER);
+        register(EntityGoalTempt.DESERIALIZER);
+        register(EntityGoalTryFindWater.DESERIALIZER);
+        register(EntityGoalUseItem.DESERIALIZER);
+        register(EntityGoalWaterAvoidingRandomFlying.DESERIALIZER);
+        register(EntityGoalWaterAvoidingRandomStroll.DESERIALIZER);
+        register(EntityGoalWolfBeg.DESERIALIZER);
+        register(EntityGoalBreed.DESERIALIZER);
+        register(EntityGoalCatSitOnBed.DESERIALIZER);
+        register(EntityGoalCatLieOnBed.DESERIALIZER);
+        register(EntityGoalIllusionerBlindnessSpell.DESERIALIZER);
+        register(EntityGoalIllusionerMirrorSpell.DESERIALIZER);
+    }
+
+    /**
+     * Get deserializer by key.
+     *
+     * @param key The key.
+     * @return The deserializer, or null if not found.
+     */
+    @Nullable
+    public static KeyedDeserializer<? extends EntityGoal<? extends Mob>> getByKey(@NotNull final NamespacedKey key) {
+        return BY_KEY.get(key);
+    }
+
+    /**
+     * Get deserializer by key, with a defined type (to prevent cluttering code with unsafe casts).
+     *
+     * @param key   The key.
+     * @param clazz The type of target goal.
+     * @param <T>   The type of mob the goal can be applied to.
+     * @return The deserializer, or null if not found.
+     */
+    @Nullable
+    @SuppressWarnings({"unchecked", "unused"})
+    public static <T extends Mob> KeyedDeserializer<EntityGoal<T>> getByKeyOfType(@NotNull final NamespacedKey key,
+                                                                                  @NotNull final Class<T> clazz) {
+        return (KeyedDeserializer<EntityGoal<T>>) BY_KEY.get(key);
+    }
+
+    /**
+     * Apply goal to entity given key and config.
+     * <p>
+     * If the key or config are invalid, the goal will not be applied.
+     *
+     * @param entity   The entity.
+     * @param key      The key.
+     * @param config   The config.
+     * @param priority The priority.
+     * @param <T>      The entity type.
+     * @return The entity.
+     */
+    @NotNull
+    @SuppressWarnings("unchecked")
+    public static <T extends Mob> T applyToEntity(@NotNull final T entity,
+                                                  @NotNull final NamespacedKey key,
+                                                  @NotNull final Config config,
+                                                  final int priority) {
+        KeyedDeserializer<EntityGoal<T>> deserializer = getByKeyOfType(key, (Class<T>) entity.getClass());
+        if (deserializer == null) {
+            return entity;
+        }
+
+        EntityGoal<T> goal = deserializer.deserialize(config);
+
+        if (goal == null) {
+            return entity;
+        }
+
+        return goal.addToEntity(entity, priority);
+    }
+
+    /**
+     * Register a deserializer for an entity goal.
+     *
+     * @param toRegister The entity goal to register.
+     * @param <T>        The type of deserializer.
+     * @return The deserializer.
+     */
+    @NotNull
+    public static <T extends KeyedDeserializer<? extends EntityGoal<?>>> T register(@NotNull final T toRegister) {
+        BY_KEY.put(toRegister.getKey(), toRegister);
+        return toRegister;
+    }
+
+    private EntityGoals() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/Goal.java

@@ -0,0 +1,24 @@
+package com.willfp.eco.core.entities.ai;
+
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * A generic goal for entity AI.
+ *
+ * @param <T> The type of mob that the goal can be applied to.
+ */
+public interface Goal<T extends Mob> {
+    /**
+     * Add the entity goal to an entity.
+     * <p>
+     * The lower the priority, the higher up the execution order; so
+     * priority 0 will execute first. Lower priority (higher number) goals
+     * will only execute if all higher priority goals are stopped.
+     *
+     * @param entity   The entity.
+     * @param priority The priority.
+     * @return The entity, modified.
+     */
+    T addToEntity(@NotNull T entity, int priority);
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/GoalFlag.java

@@ -0,0 +1,26 @@
+package com.willfp.eco.core.entities.ai;
+
+/**
+ * Flags for ai goals.
+ */
+public enum GoalFlag {
+    /**
+     * Move.
+     */
+    MOVE,
+
+    /**
+     * Look around.
+     */
+    LOOK,
+
+    /**
+     * Jump.
+     */
+    JUMP,
+
+    /**
+     * Target.
+     */
+    TARGET
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/TargetGoal.java

@@ -0,0 +1,18 @@
+package com.willfp.eco.core.entities.ai;
+
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * A goal for entity target AI.
+ *
+ * @param <T> The type of mob that the goal can be applied to.
+ */
+public interface TargetGoal<T extends Mob> extends Goal<T> {
+    @Override
+    default T addToEntity(@NotNull T entity, int priority) {
+        return EntityController.getFor(entity)
+                .addTargetGoal(priority, this)
+                .getEntity();
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/TargetGoals.java

@@ -0,0 +1,117 @@
+package com.willfp.eco.core.entities.ai;
+
+import com.google.common.collect.HashBiMap;
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.target.TargetGoalDefendVillage;
+import com.willfp.eco.core.entities.ai.target.TargetGoalHurtBy;
+import com.willfp.eco.core.entities.ai.target.TargetGoalNearestAttackable;
+import com.willfp.eco.core.entities.ai.target.TargetGoalNearestAttackableWitch;
+import com.willfp.eco.core.entities.ai.target.TargetGoalNearestHealableRaider;
+import com.willfp.eco.core.entities.ai.target.TargetGoalNonTameRandom;
+import com.willfp.eco.core.entities.ai.target.TargetGoalOwnerHurtBy;
+import com.willfp.eco.core.entities.ai.target.TargetGoalOwnerTarget;
+import com.willfp.eco.core.entities.ai.target.TargetGoalResetUniversalAnger;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Map;
+
+/**
+ * Class to manage target goals.
+ */
+public final class TargetGoals {
+    /**
+     * All registered deserializers.
+     */
+    private static final Map<NamespacedKey, KeyedDeserializer<? extends TargetGoal<?>>> BY_KEY = HashBiMap.create();
+
+    static {
+        register(TargetGoalDefendVillage.DESERIALIZER);
+        register(TargetGoalHurtBy.DESERIALIZER);
+        register(TargetGoalNearestAttackable.DESERIALIZER);
+        register(TargetGoalNearestAttackableWitch.DESERIALIZER);
+        register(TargetGoalNearestHealableRaider.DESERIALIZER);
+        register(TargetGoalNonTameRandom.DESERIALIZER);
+        register(TargetGoalOwnerTarget.DESERIALIZER);
+        register(TargetGoalOwnerHurtBy.DESERIALIZER);
+        register(TargetGoalResetUniversalAnger.DESERIALIZER);
+    }
+
+    /**
+     * Get deserializer by key.
+     *
+     * @param key The key.
+     * @return The deserializer, or null if not found.
+     */
+    @Nullable
+    public static KeyedDeserializer<? extends TargetGoal<? extends Mob>> getByKey(@NotNull final NamespacedKey key) {
+        return BY_KEY.get(key);
+    }
+
+    /**
+     * Get deserializer by key, with a defined type (to prevent cluttering code with unsafe casts).
+     *
+     * @param key   The key.
+     * @param clazz The type of target goal.
+     * @param <T>   The type of mob the goal can be applied to.
+     * @return The deserializer, or null if not found.
+     */
+    @Nullable
+    @SuppressWarnings({"unchecked", "unused"})
+    public static <T extends Mob> KeyedDeserializer<TargetGoal<T>> getByKeyOfType(@NotNull final NamespacedKey key,
+                                                                                  @NotNull final Class<T> clazz) {
+        return (KeyedDeserializer<TargetGoal<T>>) BY_KEY.get(key);
+    }
+
+    /**
+     * Apply goal to entity given key and config.
+     * <p>
+     * If the key or config are invalid, the goal will not be applied.
+     *
+     * @param entity   The entity.
+     * @param key      The key.
+     * @param config   The config.
+     * @param priority The priority.
+     * @param <T>      The entity type.
+     * @return The entity.
+     */
+    @NotNull
+    @SuppressWarnings("unchecked")
+    public static <T extends Mob> T applyToEntity(@NotNull final T entity,
+                                                  @NotNull final NamespacedKey key,
+                                                  @NotNull final Config config,
+                                                  final int priority) {
+        KeyedDeserializer<TargetGoal<T>> deserializer = getByKeyOfType(key, (Class<T>) entity.getClass());
+        if (deserializer == null) {
+            return entity;
+        }
+
+        TargetGoal<T> goal = deserializer.deserialize(config);
+
+        if (goal == null) {
+            return entity;
+        }
+
+        return goal.addToEntity(entity, priority);
+    }
+
+    /**
+     * Register a deserializer for a target goal.
+     *
+     * @param toRegister The target goal to register.
+     * @param <T>        The type of deserializer.
+     * @return The deserializer.
+     */
+    @NotNull
+    public static <T extends KeyedDeserializer<? extends TargetGoal<?>>> T register(@NotNull final T toRegister) {
+        BY_KEY.put(toRegister.getKey(), toRegister);
+        return toRegister;
+    }
+
+    private TargetGoals() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalAvoidEntity.java

@@ -0,0 +1,73 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.Entities;
+import com.willfp.eco.core.entities.TestableEntity;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Avoid entities.
+ *
+ * @param entity       The entity type to avoid.
+ * @param distance The distance to flee to.
+ * @param slowSpeed    The slow movement speed.
+ * @param fastSpeed    The fast movement speed.
+ */
+public record EntityGoalAvoidEntity(
+        @NotNull TestableEntity entity,
+        double distance,
+        double slowSpeed,
+        double fastSpeed
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalAvoidEntity> DESERIALIZER = new Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalAvoidEntity> {
+        @Override
+        @Nullable
+        public EntityGoalAvoidEntity deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("entity")
+                            && config.has("distance")
+                            && config.has("slowSpeed")
+                            && config.has("fastSpeed")
+            )) {
+                return null;
+            }
+
+            try {
+                TestableEntity entity = Entities.lookup(config.getString("entity"));
+
+                return new EntityGoalAvoidEntity(
+                        entity,
+                        config.getDouble("distance"),
+                        config.getDouble("slowSpeed"),
+                        config.getDouble("fastSpeed")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("avoid_entity");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalBreakDoors.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to break down doors.
+ *
+ * @param ticks The time taken to break the door. Minimum value is 240, as set by the game.
+ */
+public record EntityGoalBreakDoors(
+        int ticks
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalBreakDoors> DESERIALIZER = new EntityGoalBreakDoors.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalBreakDoors> {
+        @Override
+        @Nullable
+        public EntityGoalBreakDoors deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("ticks")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalBreakDoors(
+                        config.getInt("ticks")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("break_doors");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalBreatheAir.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Breathe air.
+ */
+public record EntityGoalBreatheAir(
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalBreatheAir> DESERIALIZER = new EntityGoalBreatheAir.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalBreatheAir> {
+        @Override
+        public EntityGoalBreatheAir deserialize(@NotNull final Config config) {
+            return new EntityGoalBreatheAir();
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("breathe_air");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalBreed.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Animals;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows animals to breed.
+ *
+ * @param speed The speed at which to move to a partner.
+ */
+public record EntityGoalBreed(
+        double speed
+) implements EntityGoal<Animals> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalBreed> DESERIALIZER = new EntityGoalBreed.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalBreed> {
+        @Override
+        @Nullable
+        public EntityGoalBreed deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalBreed(
+                        config.getDouble("speed")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("breed");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalCatLieOnBed.java

@@ -0,0 +1,61 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Cat;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows a cat to lie on a bed.
+ *
+ * @param speed The speed at which to move to the bed.
+ * @param range The range at which to search for beds.
+ */
+public record EntityGoalCatLieOnBed(
+        double speed,
+        int range
+) implements EntityGoal<Cat> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalCatLieOnBed> DESERIALIZER = new EntityGoalCatLieOnBed.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalCatLieOnBed> {
+        @Override
+        @Nullable
+        public EntityGoalCatLieOnBed deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+                            && config.has("range")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalCatLieOnBed(
+                        config.getDouble("speed"),
+                        config.getInt("range")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("cat_lie_on_bed");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalCatSitOnBed.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Cat;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows a cat to sit on a bed.
+ *
+ * @param speed The speed at which to move to the bed.
+ */
+public record EntityGoalCatSitOnBed(
+        double speed
+) implements EntityGoal<Cat> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalCatSitOnBed> DESERIALIZER = new EntityGoalCatSitOnBed.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalCatSitOnBed> {
+        @Override
+        @Nullable
+        public EntityGoalCatSitOnBed deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalCatSitOnBed(
+                        config.getDouble("speed")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("cat_sit_on_bed");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalEatGrass.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Allows an entity to eat the ground.
+ */
+public record EntityGoalEatGrass(
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalEatGrass> DESERIALIZER = new EntityGoalEatGrass.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalEatGrass> {
+        @Override
+        public EntityGoalEatGrass deserialize(@NotNull final Config config) {
+            return new EntityGoalEatGrass();
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("eat_grass");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalFleeSun.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Will make the entity actively avoid the sunlight.
+ *
+ * @param speed The speed at which to flee.
+ */
+public record EntityGoalFleeSun(
+        double speed
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalFleeSun> DESERIALIZER = new EntityGoalFleeSun.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalFleeSun> {
+        @Override
+        @Nullable
+        public EntityGoalFleeSun deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalFleeSun(
+                        config.getDouble("speed")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("flee_sun");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalFloat.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Allows an entity to float on water.
+ */
+public record EntityGoalFloat(
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalFloat> DESERIALIZER = new EntityGoalFloat.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalFloat> {
+        @Override
+        public EntityGoalFloat deserialize(@NotNull final Config config) {
+            return new EntityGoalFloat();
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("float");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalFollowBoats.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Follow boats.
+ */
+public record EntityGoalFollowBoats(
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalFollowBoats> DESERIALIZER = new EntityGoalFollowBoats.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalFollowBoats> {
+        @Override
+        public EntityGoalFollowBoats deserialize(@NotNull final Config config) {
+            return new EntityGoalFollowBoats();
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("follow_boats");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalFollowMobs.java

@@ -0,0 +1,65 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to follow and gather around all types of mobs, both hostile and neutral mobs.
+ *
+ * @param speed       The speed at which to follow.
+ * @param minDistance The minimum follow distance.
+ * @param maxDistance The maximum follow distance.
+ */
+public record EntityGoalFollowMobs(
+        double speed,
+        double minDistance,
+        double maxDistance
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalFollowMobs> DESERIALIZER = new EntityGoalFollowMobs.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalFollowMobs> {
+        @Override
+        @Nullable
+        public EntityGoalFollowMobs deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+                            && config.has("minDistance")
+                            && config.has("maxDistance")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalFollowMobs(
+                        config.getDouble("speed"),
+                        config.getDouble("minDistance"),
+                        config.getDouble("maxDistance")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("follow_mobs");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalIllusionerBlindnessSpell.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Illusioner;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Allows an illusioner to perform the blindness spell.
+ */
+public record EntityGoalIllusionerBlindnessSpell(
+) implements EntityGoal<Illusioner> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalIllusionerBlindnessSpell> DESERIALIZER = new EntityGoalIllusionerBlindnessSpell.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalIllusionerBlindnessSpell> {
+        @Override
+        public EntityGoalIllusionerBlindnessSpell deserialize(@NotNull final Config config) {
+            return new EntityGoalIllusionerBlindnessSpell();
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("illusioner_blindness_spell");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalIllusionerMirrorSpell.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Illusioner;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Allows an illusioner to perform the mirror spell.
+ */
+public record EntityGoalIllusionerMirrorSpell(
+) implements EntityGoal<Illusioner> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalIllusionerMirrorSpell> DESERIALIZER = new EntityGoalIllusionerMirrorSpell.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalIllusionerMirrorSpell> {
+        @Override
+        public EntityGoalIllusionerMirrorSpell deserialize(@NotNull final Config config) {
+            return new EntityGoalIllusionerMirrorSpell();
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("illusioner_mirror_spell");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalInteract.java

@@ -0,0 +1,67 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.Entities;
+import com.willfp.eco.core.entities.TestableEntity;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Interact with other mobs.
+ *
+ * @param target The type of entity to interact with.
+ * @param range  The range at which to interact.
+ * @param chance The chance for interaction, between 0 and 1.
+ */
+public record EntityGoalInteract(
+        @NotNull TestableEntity target,
+        double range,
+        double chance
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalInteract> DESERIALIZER = new EntityGoalInteract.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalInteract> {
+        @Override
+        @Nullable
+        public EntityGoalInteract deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("target")
+                            && config.has("range")
+                            && config.has("chance")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalInteract(
+                        Entities.lookup(config.getString("target")),
+                        config.getDouble("range"),
+                        config.getDouble("chance")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("interact");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalLeapAtTarget.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to jump towards a target.
+ *
+ * @param velocity The leap velocity.
+ */
+public record EntityGoalLeapAtTarget(
+        double velocity
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalLeapAtTarget> DESERIALIZER = new EntityGoalLeapAtTarget.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalLeapAtTarget> {
+        @Override
+        @Nullable
+        public EntityGoalLeapAtTarget deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("velocity")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalLeapAtTarget(
+                        config.getDouble("velocity")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("leap_at_target");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalLookAtPlayer.java

@@ -0,0 +1,61 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to look at the player by rotating the head bone pose within a set limit.
+ *
+ * @param range  The range at which to look at the player.
+ * @param chance The chance to look at the player, between 0 and 1.
+ */
+public record EntityGoalLookAtPlayer(
+        double range,
+        double chance
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalLookAtPlayer> DESERIALIZER = new EntityGoalLookAtPlayer.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalLookAtPlayer> {
+        @Override
+        @Nullable
+        public EntityGoalLookAtPlayer deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("range")
+                            && config.has("chance")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalLookAtPlayer(
+                        config.getDouble("range"),
+                        config.getDouble("chance")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("look_at_player");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMeleeAttack.java

@@ -0,0 +1,61 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows entities to make close combat melee attacks.
+ *
+ * @param speed            The speed at which to attack the target.
+ * @param pauseWhenMobIdle If the entity should pause attacking when the target is idle.
+ */
+public record EntityGoalMeleeAttack(
+        double speed,
+        boolean pauseWhenMobIdle
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalMeleeAttack> DESERIALIZER = new EntityGoalMeleeAttack.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalMeleeAttack> {
+        @Override
+        @Nullable
+        public EntityGoalMeleeAttack deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+                            && config.has("pauseWhenMobIdle")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalMeleeAttack(
+                        config.getDouble("speed"),
+                        config.getBool("pauseWhenMobIdle")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("melee_attack");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMoveBackToVillage.java

@@ -0,0 +1,61 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to navigate and search for a nearby village.
+ *
+ * @param speed      The speed at which to move back to the village.
+ * @param canDespawn If the entity can despawn.
+ */
+public record EntityGoalMoveBackToVillage(
+        double speed,
+        boolean canDespawn
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalMoveBackToVillage> DESERIALIZER = new EntityGoalMoveBackToVillage.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalMoveBackToVillage> {
+        @Override
+        @Nullable
+        public EntityGoalMoveBackToVillage deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+                            && config.has("canDespawn")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalMoveBackToVillage(
+                        config.getDouble("speed"),
+                        config.getBool("canDespawn")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("move_back_to_village");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMoveThroughVillage.java

@@ -0,0 +1,69 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows the entity to create paths around the village.
+ *
+ * @param speed               The speed at which to move through the village.
+ * @param onlyAtNight         If the entity can only move through village at night.
+ * @param distance            The distance to move through the village.
+ * @param canPassThroughDoors If the entity can pass through doors.
+ */
+public record EntityGoalMoveThroughVillage(
+        double speed,
+        boolean onlyAtNight,
+        int distance,
+        boolean canPassThroughDoors
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalMoveThroughVillage> DESERIALIZER = new EntityGoalMoveThroughVillage.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalMoveThroughVillage> {
+        @Override
+        @Nullable
+        public EntityGoalMoveThroughVillage deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+                            && config.has("onlyAtNight")
+                            && config.has("distance")
+                            && config.has("canPassThroughDoors")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalMoveThroughVillage(
+                        config.getDouble("speed"),
+                        config.getBool("onlyAtNight"),
+                        config.getInt("distance"),
+                        config.getBool("canPassThroughDoors")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("move_through_village");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMoveTowardsRestriction.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Move towards restriction.
+ *
+ * @param speed The speed at which to move towards the restriction.
+ */
+public record EntityGoalMoveTowardsRestriction(
+        double speed
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalMoveTowardsRestriction> DESERIALIZER = new EntityGoalMoveTowardsRestriction.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalMoveTowardsRestriction> {
+        @Override
+        @Nullable
+        public EntityGoalMoveTowardsRestriction deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalMoveTowardsRestriction(
+                        config.getDouble("speed")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("move_towards_restriction");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMoveTowardsTarget.java

@@ -0,0 +1,61 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to move towards a target.
+ *
+ * @param speed       The speed at which to move towards the target.
+ * @param maxDistance The maximum distance the target can be where the entity will still move towards it.
+ */
+public record EntityGoalMoveTowardsTarget(
+        double speed,
+        double maxDistance
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalMoveTowardsTarget> DESERIALIZER = new EntityGoalMoveTowardsTarget.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalMoveTowardsTarget> {
+        @Override
+        @Nullable
+        public EntityGoalMoveTowardsTarget deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+                            && config.has("maxDistance")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalMoveTowardsTarget(
+                        config.getDouble("speed"),
+                        config.getDouble("maxDistance")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("move_towards_target");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalOcelotAttack.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Attack like an ocelot.
+ */
+public record EntityGoalOcelotAttack(
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalOcelotAttack> DESERIALIZER = new EntityGoalOcelotAttack.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalOcelotAttack> {
+        @Override
+        public EntityGoalOcelotAttack deserialize(@NotNull final Config config) {
+            return new EntityGoalOcelotAttack();
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("ocelot_attack");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalOpenDoors.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to interact and open a door.
+ *
+ * @param delayClosing If closing the door should be delayed.
+ */
+public record EntityGoalOpenDoors(
+        boolean delayClosing
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalOpenDoors> DESERIALIZER = new EntityGoalOpenDoors.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalOpenDoors> {
+        @Override
+        @Nullable
+        public EntityGoalOpenDoors deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("delayClosing")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalOpenDoors(
+                        config.getBool("delayClosing")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("open_doors");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalPanic.java

@@ -0,0 +1,57 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to react when it receives damage.
+ *
+ * @param speed The speed at which to panic.
+ */
+public record EntityGoalPanic(
+        double speed
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalPanic> DESERIALIZER = new EntityGoalPanic.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalPanic> {
+        @Override
+        @Nullable
+        public EntityGoalPanic deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalPanic(
+                        config.getDouble("speed")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("panic");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalRandomLookAround.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Allows an entity to choose a random direction to look in for a random duration within a range.
+ */
+public record EntityGoalRandomLookAround(
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalRandomLookAround> DESERIALIZER = new EntityGoalRandomLookAround.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalRandomLookAround> {
+        @Override
+        public EntityGoalRandomLookAround deserialize(@NotNull final Config config) {
+            return new EntityGoalRandomLookAround();
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("random_look_around");
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalRandomStroll.java

@@ -0,0 +1,65 @@
+package com.willfp.eco.core.entities.ai.entity;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.entities.ai.EntityGoal;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Mob;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Allows an entity to choose a random direction to walk towards.
+ *
+ * @param speed      The speed at which to move around.
+ * @param interval   The amount of ticks to wait (on average) between strolling around.
+ * @param canDespawn If the entity can despawn.
+ */
+public record EntityGoalRandomStroll(
+        double speed,
+        int interval,
+        boolean canDespawn
+) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalRandomStroll> DESERIALIZER = new EntityGoalRandomStroll.Deserializer();
+
+    /**
+     * Deserialize configs into the goal.
+     */
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalRandomStroll> {
+        @Override
+        @Nullable
+        public EntityGoalRandomStroll deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("speed")
+                            && config.has("interval")
+                            && config.has("canDespawn")
+            )) {
+                return null;
+            }
+
+            try {
+                return new EntityGoalRandomStroll(
+                        config.getDouble("speed"),
+                        config.getInt("interval"),
+                        config.getBool("canDespawn")
+                );
+            } catch (Exception e) {
+                /*
+                Exceptions could be caused by configs having values of a wrong type,
+                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
+                so we encapsulate them as null.
+                 */
+                return null;
+            }
+        }
+
+        @NotNull
+        @Override
+        public NamespacedKey getKey() {
+            return NamespacedKey.minecraft("random_stroll");
+        }
+    }
+}