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/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

@@ -1,6 +1,6 @@
 name: Java CI
 
-on: [push]
+on: [ push, pull_request ]
 
 jobs:
   build:

.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

CONTRIBUTING.md

@@ -1,24 +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 JetBrains annotations
+
 - Every parameter should be annotated with @NotNull or @Nullable
-- Use @NotNull over lombok @NonNull
 
 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 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 17.

README.md

@@ -29,7 +29,7 @@ and many more.
 
 # For server owners
 - Requires ProtocolLib to be installed: get the latest version [here](https://www.spigotmc.org/resources/protocollib.1997/)
-- Supports 1.16.5+
+- Supports 1.17+
 
 ## Downloads
 
@@ -39,7 +39,7 @@ and many more.
 # For developers
 
 ## Javadoc
-The 6.13.0 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.13.0/javadoc/)
+The 6.38.2 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.38.2/javadoc/)
 
 ## Plugin Information
 
@@ -68,7 +68,7 @@ dependencies {
 }
 ```
 
-Replace `Tag` with a release tag for eco, eg `6.13.0`.
+Replace `Tag` with a release tag for eco, eg `6.27.2`.
 
 Maven:
 
@@ -88,7 +88,7 @@ Maven:
 </dependency>
 ```
 
-Replace `Tag` with a release tag for eco, eg `6.13.0`.
+Replace `Tag` with a release tag for eco, eg `6.27.2`.
 
 ## Build locally:
 

build.gradle.kts

@@ -1,18 +1,30 @@
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10")
+    }
+}
+
 plugins {
     id("java-library")
-    id("com.github.johnrengelman.shadow") version "7.0.0"
+    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(":eco-core:core-plugin"))
+    implementation(project(path = ":eco-core:core-plugin", configuration = "shadow"))
     implementation(project(":eco-core:core-proxy"))
     implementation(project(":eco-core:core-backend"))
-    implementation(project(":eco-core:core-nms:v1_16_R3"))
     implementation(project(path = ":eco-core:core-nms:v1_17_R1", configuration = "reobf"))
-    implementation(project(":eco-core:core-nms:v1_18_R1"))
+    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 {
@@ -20,6 +32,7 @@ allprojects {
     apply(plugin = "java-library")
     apply(plugin = "maven-publish")
     apply(plugin = "com.github.johnrengelman.shadow")
+    apply(plugin = "kotlin")
 
     repositories {
         mavenCentral()
@@ -32,11 +45,8 @@ allprojects {
         // SuperiorSkyblock2
         maven("https://repo.bg-software.com/repository/api/")
 
-        // NMS (for jitpack compilation)
-        maven("https://repo.codemc.org/repository/nms/")
-
-        // bStats, mcMMO, BentoBox
-        maven("https://repo.codemc.org/repository/maven-public/")
+        // mcMMO, BentoBox
+        maven("https://repo.codemc.io/repository/maven-public/")
 
         // Spigot API, Bungee API
         maven("https://hub.spigotmc.org/nexus/content/repositories/snapshots/")
@@ -51,7 +61,7 @@ allprojects {
         maven("https://maven.enginehub.org/repo/")
 
         // FactionsUUID
-        maven("https://ci.ender.zone/plugin/repository/everything/")
+        //maven("https://ci.ender.zone/plugin/repository/everything/")
 
         // NoCheatPlus
         maven("https://repo.md-5.net/content/repositories/snapshots/")
@@ -59,21 +69,42 @@ allprojects {
         // CombatLogX
         maven("https://nexus.sirblobman.xyz/repository/public/")
 
-        // IridiumSkyblock
-        maven("https://nexus.iridiumdevelopment.net/repository/maven-releases/")
+        // 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:5.8.1")
-        testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.1")
-        
+        testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
+        testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.2")
+
         // Adventure
-        compileOnly("net.kyori:adventure-api:4.9.3")
-        compileOnly("net.kyori:adventure-text-serializer-gson:4.9.3")
-        compileOnly("net.kyori:adventure-text-serializer-legacy:4.9.3")
+        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> {
@@ -88,12 +119,53 @@ allprojects {
         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.shaded.bstats")
-            relocate("net.kyori.adventure.text.minimessage", "com.willfp.eco.shaded.minimessage")
+            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 {

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

config/checkstyle/suppression.xml

@@ -1,24 +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>
-    <!-- Internals don't need javadoc. -->
-    <suppress files="[\\/]internal[\\/]" checks="MissingJavadocMethod"/>
-    <suppress files="[\\/]internal[\\/]" checks="JavadocVariable"/>
-    <suppress files="[\\/]eco[\\/]spigot[\\/]" checks="MissingJavadocMethod"/>
-    <suppress files="[\\/]eco[\\/]spigot[\\/]" checks="JavadocVariable"/>
-    <suppress files="[\\/]eco[\\/]proxy[\\/]" checks="MissingJavadocMethod"/>
-    <suppress files="[\\/]eco[\\/]proxy[\\/]" checks="JavadocVariable"/>
-
-    <!-- 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

@@ -1,27 +1,20 @@
-plugins {
-    id 'com.github.johnrengelman.shadow'
+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
 
-dependencies {
-    // Adventure
-    compileOnly 'net.kyori:adventure-platform-bukkit:4.0.0'
-    compileOnly 'net.kyori:adventure-text-minimessage:4.1.0-SNAPSHOT'
-
-    // Other
-    compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
-    compileOnly 'org.apache.maven:maven-artifact:3.8.1'
-    compileOnly 'com.comphenix.protocol:ProtocolLib:4.6.1-SNAPSHOT'
-    compileOnly 'com.google.code.gson:gson:2.8.8'
-}
-
 java {
     withJavadocJar()
 }
 
-
 build.dependsOn publishToMavenLocal
 
 publishing {
@@ -42,4 +35,4 @@ publishing {
             }
         }
     }
-}
+}

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

@@ -4,11 +4,20 @@ 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;
+
 /**
- * Base class to hold the handler.
+ * 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.
@@ -18,6 +27,7 @@ public final class Eco {
 
     /**
      * Set the handler.
+     *
      * @param handler The handler.
      */
     @ApiStatus.Internal
@@ -28,18 +38,18 @@ public final class Eco {
     }
 
     /**
-     * Get the instance of the eco handler.
+     * Get the instance of the eco handler; the bridge between the api frontend
+     * and the implementation backend.
      * <p>
-     * The handler is, in essence, a way to interface between the eco-api
-     * frontend module, and the eco-backend implementations.
+     * <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>
-     * There shouldn't really be any reason to ever use the handler
-     * in your own plugins, and you are likely to break things. All parts of
-     * the handler are abstracted into logically named parts of the API.
-     * <p>
-     * In versions of eco before 6.12.0, the handler was considered part of
-     * the eco API, however it has since been moved into an internal component
-     * that shouldn't be used in your plugins.
+     * 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.
      */
@@ -48,6 +58,24 @@ public final class Eco {
         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

@@ -14,7 +14,6 @@ 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.AbstractProxy;
 import com.willfp.eco.core.proxy.ProxyFactory;
 import com.willfp.eco.core.scheduling.Scheduler;
 import com.willfp.eco.core.web.UpdateChecker;
@@ -32,6 +31,7 @@ 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;
@@ -152,10 +152,14 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     private final ProxyFactory proxyFactory;
 
     /**
-     * Create a new plugin without a specified color, proxy support, polymart, or bStats.
+     * 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("&f");
+        this((PluginProps) null);
     }
 
     /**
@@ -236,6 +240,23 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
                         @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().
@@ -253,15 +274,15 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         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 do use reflection to get a 'createHandler'
-        method that only exists in EcoSpigotPlugin - but that feels really dirty
+        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.
+            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.
@@ -272,11 +293,21 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
 
         assert Eco.getHandler() != null;
 
-        this.resourceId = resourceId;
-        this.bStatsId = bStatsId;
-        this.proxyPackage = proxyPackage;
-        this.color = color;
-        this.supportingExtensions = supportingExtensions;
+        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);
@@ -285,8 +316,6 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         this.runnableFactory = Eco.getHandler().createRunnableFactory(this);
         this.extensionLoader = Eco.getHandler().createExtensionLoader(this);
         this.configHandler = Eco.getHandler().createConfigHandler(this);
-        this.logger = Eco.getHandler().createLogger(this);
-        this.proxyFactory = this.proxyPackage.equalsIgnoreCase("") ? null : Eco.getHandler().createProxyFactory(this);
 
         this.langYml = this.createLangYml();
         this.configYml = this.createConfigYml();
@@ -296,8 +325,8 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         /*
         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
-        because they have an outdated version of eco installed.
+        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());
@@ -321,17 +350,15 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         this.getLogger().info("");
         this.getLogger().info("Loading " + this.getColor() + this.getName());
 
-        if (this.getResourceId() != 0) {
+        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.getScheduler().runTimer(() -> {
-                        this.getLogger().info("&c " + this.getName() + " is out of date! (Version " + this.getDescription().getVersion() + ")");
-                        this.getLogger().info("&cThe newest version is &f" + version);
-                        this.getLogger().info("&cDownload the new version!");
-                    }, 0, 864000);
+                    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!");
                 }
             });
         }
@@ -350,12 +377,12 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
             PlaceholderManager.addIntegration(Eco.getHandler().createPAPIIntegration(this));
         }
 
-        this.loadIntegrationLoaders().forEach((integrationLoader -> {
+        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()));
 
@@ -465,9 +492,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     public final void reload() {
         this.getConfigHandler().updateConfigs();
 
+        this.getScheduler().cancelAll();
         this.getConfigHandler().callUpdate();
         this.getConfigHandler().callUpdate(); // Call twice to fix issues
-        this.getScheduler().cancelAll();
 
         this.handleReload();
 
@@ -536,6 +563,21 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
 
     }
 
+    /**
+     * 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.
      *
@@ -636,8 +678,8 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param <T>        The proxy type.
      * @return The proxy.
      */
-    public final <T extends AbstractProxy> T getProxy(@NotNull final Class<T> proxyClass) {
-        Validate.notNull(proxyFactory, "Plugin does not support proxy!");
+    public final <T> T getProxy(@NotNull final Class<T> proxyClass) {
+        Validate.notNull(proxyFactory, "Plugin does not support proxies!");
 
         return proxyFactory.getProxy(proxyClass);
     }
@@ -655,7 +697,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     public final FileConfiguration getConfig() {
         this.getLogger().warning("Call to default config method in eco plugin!");
 
-        return this.getConfigYml().getBukkitHandle();
+        return Objects.requireNonNull(this.getConfigYml().toBukkit());
     }
 
     /**

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

@@ -2,9 +2,11 @@ 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.PlayerProfileHandler;
+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;
@@ -13,12 +15,17 @@ 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.requirement.RequirementFactory;
 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;
@@ -201,14 +208,6 @@ public interface Handler {
      */
     void registerBStats(@NotNull EcoPlugin plugin);
 
-    /**
-     * Get the requirement factory.
-     *
-     * @return The factory.
-     */
-    @NotNull
-    RequirementFactory getRequirementFactory();
-
     /**
      * Get Adventure audiences.
      *
@@ -230,5 +229,84 @@ public interface Handler {
      *
      * @return The handler.
      */
-    PlayerProfileHandler getPlayerProfileHandler();
+    @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

@@ -4,6 +4,13 @@ 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.
  */

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

@@ -3,6 +3,7 @@ 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}
@@ -26,4 +27,11 @@ public interface PluginLike {
      * @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

@@ -26,7 +26,7 @@ public class Prerequisite {
      * Requires the server to be running an implementation of paper.
      */
     public static final Prerequisite HAS_PAPER = new Prerequisite(
-            () -> ClassUtils.exists("com.destroystokyo.paper.event.player.PlayerElytraBoostEvent"),
+            () -> ClassUtils.exists("com.destroystokyo.paper.event.block.BeaconEffectEvent"),
             "Requires server to be running paper (or a fork)"
     );
 
@@ -35,23 +35,34 @@ public class Prerequisite {
      *
      * @deprecated Use {@link EconomyManager#hasRegistrations()} instead.
      */
-    @Deprecated
+    @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"),
+            () -> 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+"

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

@@ -1,10 +1,16 @@
 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.
@@ -35,31 +41,77 @@ public interface CommandBase {
      */
     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

@@ -10,9 +10,13 @@ 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.

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

@@ -10,9 +10,13 @@ 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.

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

@@ -1,14 +1,12 @@
 package com.willfp.eco.core.command.impl;
 
 import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
 import com.willfp.eco.core.command.CommandBase;
-import com.willfp.eco.core.command.CommandHandler;
-import com.willfp.eco.core.command.TabCompleteHandler;
 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;
@@ -23,7 +21,13 @@ import java.util.stream.Collectors;
  * in order to execute the command-specific code. It's essentially an internal
  * layer, hence why it's a package-private class.
  */
-abstract class HandledCommand extends PluginDependent<EcoPlugin> implements CommandBase {
+@SuppressWarnings({"DeprecatedIsStillUsed", "removal"})
+abstract class HandledCommand implements CommandBase {
+    /**
+     * The plugin.
+     */
+    private final EcoPlugin plugin;
+
     /**
      * The name of the command.
      */
@@ -46,14 +50,16 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
     /**
      * The actual code to be executed in the command.
      */
-    private CommandHandler handler = (sender, args) -> {
-        // Do nothing by default
-    };
+    @Deprecated
+    @Nullable
+    private com.willfp.eco.core.command.CommandHandler handler = null;
 
     /**
      * The tab completion code to be executed in the command.
      */
-    private TabCompleteHandler tabCompleter = (sender, args) -> new ArrayList<>();
+    @Deprecated
+    @Nullable
+    private com.willfp.eco.core.command.TabCompleteHandler tabCompleter = null;
 
     /**
      * All subcommands for the command.
@@ -74,7 +80,7 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
                    @NotNull final String name,
                    @NotNull final String permission,
                    final boolean playersOnly) {
-        super(plugin);
+        this.plugin = plugin;
         this.name = name;
         this.permission = permission;
         this.playersOnly = playersOnly;
@@ -94,6 +100,16 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
         return this;
     }
 
+    /**
+     * Get the plugin.
+     *
+     * @return The plugin.
+     */
+    @Override
+    public EcoPlugin getPlugin() {
+        return this.plugin;
+    }
+
     /**
      * Handle the command.
      *
@@ -120,7 +136,16 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
             }
         }
 
-        this.getHandler().onExecute(sender, Arrays.asList(args));
+        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));
+        }
     }
 
     /**
@@ -142,7 +167,10 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
 
             StringUtil.copyPartialMatches(
                     args[0],
-                    this.getSubcommands().stream().map(CommandBase::getName).collect(Collectors.toList()),
+                    this.getSubcommands().stream()
+                            .filter(subCommand -> sender.hasPermission(subCommand.getPermission()))
+                            .map(CommandBase::getName)
+                            .collect(Collectors.toList()),
                     completions
             );
 
@@ -157,6 +185,10 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
             HandledCommand command = null;
 
             for (CommandBase subcommand : this.getSubcommands()) {
+                if (!sender.hasPermission(subcommand.getPermission())) {
+                    continue;
+                }
+
                 if (args[0].equalsIgnoreCase(subcommand.getName())) {
                     command = (HandledCommand) subcommand;
                 }
@@ -167,7 +199,11 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
             }
         }
 
-        return this.getTabCompleter().tabComplete(sender, Arrays.asList(args));
+        if (this.getTabCompleter() != null) {
+            return this.getTabCompleter().tabComplete(sender, Arrays.asList(args));
+        } else {
+            return this.tabComplete(sender, Arrays.asList(args));
+        }
     }
 
     /**
@@ -181,11 +217,6 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
     public static boolean canExecute(@NotNull final CommandSender sender,
                                      @NotNull final CommandBase command,
                                      @NotNull final EcoPlugin plugin) {
-        if (command.isPlayersOnly() && !(sender instanceof Player)) {
-            sender.sendMessage(plugin.getLangYml().getMessage("not-player"));
-            return false;
-        }
-
         if (!sender.hasPermission(command.getPermission()) && sender instanceof Player) {
             sender.sendMessage(plugin.getLangYml().getNoPermission());
             return false;
@@ -221,24 +252,6 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
         return this.playersOnly;
     }
 
-    /**
-     * Get the actual code to be executed in the command.
-     *
-     * @return The code.
-     */
-    public CommandHandler getHandler() {
-        return this.handler;
-    }
-
-    /**
-     * Get the tab completion code to be executed in the command.
-     *
-     * @return The code.
-     */
-    public TabCompleteHandler getTabCompleter() {
-        return this.tabCompleter;
-    }
-
     /**
      * Get the subcommands of the command.
      *
@@ -248,21 +261,27 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
         return this.subcommands;
     }
 
-    /**
-     * Set the command handler.
-     *
-     * @param handler The handler.
-     */
-    public void setHandler(@NotNull final CommandHandler handler) {
+    @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;
     }
 
-    /**
-     * Set the tab completer.
-     *
-     * @param tabCompleter The tab completer.
-     */
-    public void setTabCompleter(@NotNull final TabCompleteHandler tabCompleter) {
+    @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

@@ -12,7 +12,9 @@ import org.jetbrains.annotations.Nullable;
 import java.util.List;
 
 /**
- * PluginCommands are the class to be used instead of CommandExecutor.
+ * 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>

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

@@ -1,20 +1,21 @@
 package com.willfp.eco.core.config.base;
 
 import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.config.yaml.YamlBaseConfig;
+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 YamlBaseConfig {
+public class ConfigYml extends BaseConfig {
     /**
      * Config.yml.
      *
      * @param plugin The plugin.
      */
     public ConfigYml(@NotNull final EcoPlugin plugin) {
-        super("config", true, plugin);
+        super("config", plugin, true, ConfigType.YAML);
     }
 
     /**
@@ -25,7 +26,7 @@ public class ConfigYml extends YamlBaseConfig {
      */
     public ConfigYml(@NotNull final EcoPlugin plugin,
                      final boolean removeUnused) {
-        super("config", removeUnused, plugin);
+        super("config", plugin, removeUnused, ConfigType.YAML);
     }
 
     /**
@@ -36,7 +37,7 @@ public class ConfigYml extends YamlBaseConfig {
      */
     public ConfigYml(@NotNull final EcoPlugin plugin,
                      @NotNull final String name) {
-        super(name, true, plugin);
+        super(name, plugin, true, ConfigType.YAML);
     }
 
     /**
@@ -49,7 +50,6 @@ public class ConfigYml extends YamlBaseConfig {
     public ConfigYml(@NotNull final EcoPlugin plugin,
                      @NotNull final String name,
                      final boolean removeUnused) {
-        super(name, removeUnused, plugin);
+        super(name, plugin, removeUnused, ConfigType.YAML);
     }
-
 }

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

@@ -1,21 +1,22 @@
 package com.willfp.eco.core.config.base;
 
 import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.config.yaml.YamlBaseConfig;
+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 YamlBaseConfig {
+public class LangYml extends BaseConfig {
     /**
      * Lang.yml.
      *
      * @param plugin The plugin.
      */
     public LangYml(@NotNull final EcoPlugin plugin) {
-        super("lang", false, plugin);
+        super("lang", plugin, false, ConfigType.YAML);
     }
 
     /**

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

@@ -1,22 +1,44 @@
 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 canfigs implement this interface.
+ * All configs implement this interface.
  * <p>
  * Contains all methods that must exist in yaml and json configurations.
  */
 @SuppressWarnings("unused")
-public interface Config extends Cloneable {
+public interface Config extends Cloneable, PlaceholderInjectable {
     /**
      * Clears cache.
+     * <p>
+     * Configs no longer have caches as they have in previous versions.
      */
-    void clearCache();
+    @Deprecated(since = "6.31.1", forRemoval = true)
+    default void clearCache() {
+        // Do nothing.
+    }
 
     /**
      * Convert the config into readable text.
@@ -42,9 +64,21 @@ public interface Config extends Cloneable {
     @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.
-     * Default implementations call {@link org.bukkit.configuration.file.YamlConfiguration#get(String)}.
      *
      * @param path The path.
      * @return The object.
@@ -54,7 +88,6 @@ public interface Config extends Cloneable {
 
     /**
      * Set an object in config.
-     * Default implementations call {@link org.bukkit.configuration.file.YamlConfiguration#set(String, Object)}
      *
      * @param path   The path.
      * @param object The object.
@@ -66,10 +99,12 @@ public interface Config extends Cloneable {
      * Get subsection from config.
      *
      * @param path The key to check.
-     * @return The subsection. Throws NPE if not found.
+     * @return The subsection. Returns an empty section if not found.
      */
     @NotNull
-    Config getSubsection(@NotNull String path);
+    default Config getSubsection(@NotNull String path) {
+        return Objects.requireNonNullElse(getSubsectionOrNull(path), new TransientConfig());
+    }
 
     /**
      * Get subsection from config.
@@ -86,7 +121,58 @@ public interface Config extends Cloneable {
      * @param path The key to fetch the value from.
      * @return The found value, or 0 if not found.
      */
-    int getInt(@NotNull String path);
+    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.
@@ -97,16 +183,6 @@ public interface Config extends Cloneable {
     @Nullable
     Integer getIntOrNull(@NotNull String path);
 
-    /**
-     * 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.
-     */
-    int getInt(@NotNull String path,
-               int def);
-
     /**
      * Get a list of integers from config.
      *
@@ -114,7 +190,9 @@ public interface Config extends Cloneable {
      * @return The found value, or a blank {@link java.util.ArrayList} if not found.
      */
     @NotNull
-    List<Integer> getInts(@NotNull String path);
+    default List<Integer> getInts(@NotNull String path) {
+        return Objects.requireNonNullElse(getIntsOrNull(path), new ArrayList<>());
+    }
 
     /**
      * Get a list of integers from config.
@@ -131,7 +209,9 @@ public interface Config extends Cloneable {
      * @param path The key to fetch the value from.
      * @return The found value, or false if not found.
      */
-    boolean getBool(@NotNull String path);
+    default boolean getBool(@NotNull String path) {
+        return Objects.requireNonNullElse(getBoolOrNull(path), false);
+    }
 
     /**
      * Get a boolean from config.
@@ -149,7 +229,9 @@ public interface Config extends Cloneable {
      * @return The found value, or a blank {@link java.util.ArrayList} if not found.
      */
     @NotNull
-    List<Boolean> getBools(@NotNull String path);
+    default List<Boolean> getBools(@NotNull String path) {
+        return Objects.requireNonNullElse(getBoolsOrNull(path), new ArrayList<>());
+    }
 
     /**
      * Get a list of booleans from config.
@@ -168,7 +250,7 @@ public interface Config extends Cloneable {
      */
     @NotNull
     default String getFormattedString(@NotNull String path) {
-        return getString(path, true);
+        return getString(path, true, StringUtils.FormatOption.WITH_PLACEHOLDERS);
     }
 
     /**
@@ -187,43 +269,14 @@ public interface Config extends Cloneable {
     /**
      * Get a string from config.
      * <p>
-     * Formatted by default.
+     * 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, true);
-    }
-
-    /**
-     * Get a string from config.
-     * <p>
-     * This will be deprecated when {@link Config#getString(String)} no longer formats by default.
-     *
-     * @param path   The key to fetch the value from.
-     * @param format If the string should be formatted.
-     * @return The found value, or an empty string if not found.
-     */
-    default String getString(@NotNull String path,
-                             boolean format) {
-        return this.getString(path, format, StringUtils.FormatOption.WITH_PLACEHOLDERS);
-    }
-
-    /**
-     * Get a 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.
-     * @deprecated Use {@link Config#getFormattedString(String, StringUtils.FormatOption)} instead.
-     */
-    @NotNull
-    @Deprecated
-    default String getString(@NotNull String path,
-                             @NotNull final StringUtils.FormatOption option) {
-        return this.getString(path, true, option);
+        return getString(path, false, StringUtils.FormatOption.WITHOUT_PLACEHOLDERS);
     }
 
     /**
@@ -235,9 +288,11 @@ public interface Config extends Cloneable {
      * @return The found value, or an empty string if not found.
      */
     @NotNull
-    String getString(@NotNull String path,
-                     boolean format,
-                     @NotNull StringUtils.FormatOption option);
+    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.
@@ -247,7 +302,7 @@ public interface Config extends Cloneable {
      */
     @Nullable
     default String getFormattedStringOrNull(@NotNull String path) {
-        return getStringOrNull(path, true);
+        return getStringOrNull(path, true, StringUtils.FormatOption.WITH_PLACEHOLDERS);
     }
 
     /**
@@ -273,37 +328,7 @@ public interface Config extends Cloneable {
      */
     @Nullable
     default String getStringOrNull(@NotNull String path) {
-        return getStringOrNull(path, true);
-    }
-
-    /**
-     * Get a string from config.
-     * <p>
-     * This will be deprecated when {@link Config#getStringOrNull(String)} no longer formats by default.
-     *
-     * @param path   The key to fetch the value from.
-     * @param format If the string should be formatted.
-     * @return The found value, or null if not found.
-     */
-    @Nullable
-    default String getStringOrNull(@NotNull String path,
-                                   boolean format) {
-        return this.getStringOrNull(path, format, StringUtils.FormatOption.WITH_PLACEHOLDERS);
-    }
-
-    /**
-     * Get a string from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param option The format option.
-     * @return The found value, or null if not found.
-     * @deprecated Use {@link Config#getFormattedString(String, StringUtils.FormatOption)} instead.
-     */
-    @Nullable
-    @Deprecated
-    default String getStringOrNull(@NotNull String path,
-                                   @NotNull StringUtils.FormatOption option) {
-        return this.getStringOrNull(path, true, option);
+        return getStringOrNull(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
     }
 
     /**
@@ -350,46 +375,14 @@ public interface Config extends Cloneable {
     /**
      * Get a list of strings from config.
      * <p>
-     * Formatted by default.
-     * <p>
-     * This will be changed in newer versions to <b>not</b> format by default.
+     * 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, true);
-    }
-
-    /**
-     * Get a list of strings from config.
-     * <p>
-     * This will be deprecated when {@link Config#getStrings(String)} no longer formats by default.
-     *
-     * @param path   The key to fetch the value from.
-     * @param format If the strings should be formatted.
-     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
-     */
-    @NotNull
-    default List<String> getStrings(@NotNull String path,
-                                    boolean format) {
-        return this.getStrings(path, format, StringUtils.FormatOption.WITH_PLACEHOLDERS);
-    }
-
-    /**
-     * Get a list of strings from config.
-     *
-     * @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.
-     * @deprecated Use {@link Config#getFormattedStrings(String, StringUtils.FormatOption)} instead.
-     */
-    @NotNull
-    @Deprecated
-    default List<String> getStrings(@NotNull String path,
-                                    @NotNull StringUtils.FormatOption option) {
-        return getStrings(path, true, option);
+        return getStrings(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
     }
 
     /**
@@ -401,14 +394,16 @@ public interface Config extends Cloneable {
      * @return The found value, or a blank {@link java.util.ArrayList} if not found.
      */
     @NotNull
-    List<String> getStrings(@NotNull String path,
-                            boolean format,
-                            @NotNull StringUtils.FormatOption option);
+    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 by default.
+     * Formatted.
      *
      * @param path The key to fetch the value from.
      * @return The found value, or null if not found.
@@ -421,7 +416,7 @@ public interface Config extends Cloneable {
     /**
      * Get a list of strings from config.
      * <p>
-     * Formatted by default.
+     * Formatted.
      *
      * @param path   The key to fetch the value from.
      * @param option The format option.
@@ -436,7 +431,7 @@ public interface Config extends Cloneable {
     /**
      * Get a list of strings from config.
      * <p>
-     * Formatted by default.
+     * Not formatted.
      * <p>
      * This will be changed in newer versions to <b>not</b> format by default.
      *
@@ -445,35 +440,7 @@ public interface Config extends Cloneable {
      */
     @Nullable
     default List<String> getStringsOrNull(@NotNull String path) {
-        return getStringsOrNull(path, true);
-    }
-
-    /**
-     * Get a list of strings from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param format If the strings should be formatted.
-     * @return The found value, or null if not found.
-     */
-    @Nullable
-    default List<String> getStringsOrNull(@NotNull String path,
-                                          boolean format) {
-        return getStringsOrNull(path, format, StringUtils.FormatOption.WITH_PLACEHOLDERS);
-    }
-
-    /**
-     * Get a list of strings from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param option The format option.
-     * @return The found value, or null if not found.
-     * @deprecated Use {@link Config#getFormattedStringsOrNull(String, StringUtils.FormatOption)} instead.
-     */
-    @Nullable
-    @Deprecated
-    default List<String> getStringsOrNull(@NotNull String path,
-                                          @NotNull StringUtils.FormatOption option) {
-        return getStringsOrNull(path, true, option);
+        return getStringsOrNull(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
     }
 
     /**
@@ -495,7 +462,45 @@ public interface Config extends Cloneable {
      * @param path The key to fetch the value from.
      * @return The found value, or 0 if not found.
      */
-    double getDouble(@NotNull String path);
+    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.
@@ -513,7 +518,9 @@ public interface Config extends Cloneable {
      * @return The found value, or a blank {@link java.util.ArrayList} if not found.
      */
     @NotNull
-    List<Double> getDoubles(@NotNull String path);
+    default List<Double> getDoubles(@NotNull String path) {
+        return Objects.requireNonNullElse(getDoublesOrNull(path), new ArrayList<>());
+    }
 
     /**
      * Get a list of decimals from config.
@@ -524,10 +531,82 @@ public interface Config extends Cloneable {
     @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/JSONConfig.java

@@ -1,55 +0,0 @@
-package com.willfp.eco.core.config.interfaces;
-
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-
-/**
- * JSON configs have extra methods compared to yaml configs.
- * <p>
- * If you need to use them, then use JSONConfig instead.
- */
-public interface JSONConfig extends Config {
-    /**
-     * 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
-    List<JSONConfig> getSubsections(@NotNull String path);
-
-    /**
-     * 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<JSONConfig> getSubsectionsOrNull(@NotNull String path);
-
-
-    /**
-     * Get subsection from config.
-     *
-     * @param path The key to check.
-     * @return The subsection. Throws NPE if not found.
-     */
-    @Override
-    @NotNull
-    JSONConfig getSubsection(@NotNull String path);
-
-    /**
-     * Get subsection from config.
-     *
-     * @param path The key to check.
-     * @return The subsection, or null if not found.
-     */
-    @Override
-    @Nullable
-    JSONConfig getSubsectionOrNull(@NotNull String path);
-
-    @Override
-    JSONConfig clone();
-}

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

@@ -1,12 +1,16 @@
 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 {
+public interface LoadableConfig extends Config {
     /**
      * Create the file.
      */
@@ -39,4 +43,25 @@ public interface LoadableConfig {
      * @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/interfaces/WrappedYamlConfiguration.java

@@ -1,17 +0,0 @@
-package com.willfp.eco.core.config.interfaces;
-
-import org.bukkit.configuration.file.YamlConfiguration;
-
-/**
- * Interface for configs that wrap an {@link YamlConfiguration}.
- *
- * @see com.willfp.eco.core.config.yaml.wrapper.YamlConfigWrapper
- */
-public interface WrappedYamlConfiguration {
-    /**
-     * Get the ConfigurationSection handle.
-     *
-     * @return The handle.
-     */
-    YamlConfiguration getBukkitHandle();
-}

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

@@ -1,78 +0,0 @@
-package com.willfp.eco.core.config.json;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Config implementation for configs present in the plugin's base directory (eg config.json).
- * <p>
- * Automatically updates.
- */
-public abstract class JSONBaseConfig extends LoadableJSONConfigWrapper {
-    /**
-     * @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.
-     */
-    protected JSONBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final PluginLike plugin,
-                             @NotNull final String... updateBlacklist) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
-                        configName,
-                        plugin,
-                        "",
-                        plugin.getClass(),
-                        removeUnused, updateBlacklist
-                )
-        );
-    }
-
-    /**
-     * @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.
-     */
-    protected JSONBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final PluginLike plugin) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
-                        configName,
-                        plugin,
-                        "",
-                        plugin.getClass(),
-                        removeUnused
-                )
-        );
-    }
-
-    /**
-     * @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.
-     */
-    protected JSONBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin,
-                             @NotNull final String... updateBlacklist) {
-        this(configName, removeUnused, (PluginLike) plugin, updateBlacklist);
-    }
-
-    /**
-     * @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.
-     */
-    protected JSONBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin) {
-        this(configName, removeUnused, (PluginLike) plugin);
-    }
-}

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

@@ -1,60 +0,0 @@
-package com.willfp.eco.core.config.json;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Config implementation for configs present in one of two places:
- * <ul>
- *     <li>Plugin base directory (eg config.yml, lang.yml)</li>
- *     <li>Other extension's configs</li>
- * </ul>
- * <p>
- * Automatically updates.
- */
-public abstract class JSONExtendableConfig extends LoadableJSONConfigWrapper {
-    /**
-     * @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 source           The class that owns the resource.
-     */
-    protected JSONExtendableConfig(@NotNull final String configName,
-                                   final boolean removeUnused,
-                                   @NotNull final PluginLike plugin,
-                                   @NotNull final Class<?> source,
-                                   @NotNull final String subDirectoryPath,
-                                   @NotNull final String... updateBlacklist) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
-                        configName,
-                        plugin,
-                        subDirectoryPath,
-                        source,
-                        removeUnused,
-                        updateBlacklist
-                )
-        );
-    }
-    /**
-     * @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 source           The class that owns the resource.
-     */
-    protected JSONExtendableConfig(@NotNull final String configName,
-                                   final boolean removeUnused,
-                                   @NotNull final EcoPlugin plugin,
-                                   @NotNull final Class<?> source,
-                                   @NotNull final String subDirectoryPath,
-                                   @NotNull final String... updateBlacklist) {
-        this(configName, removeUnused, (PluginLike) plugin, source, subDirectoryPath, updateBlacklist);
-    }
-}

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

@@ -1,38 +0,0 @@
-package com.willfp.eco.core.config.json;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Non-updatable JSON config that exists within a plugin jar.
- */
-public abstract class JSONStaticBaseConfig extends LoadableJSONConfigWrapper {
-    /**
-     * Config implementation for configs present in the plugin's base directory (eg config.json, lang.json).
-     * <p>
-     * Does not automatically update.
-     *
-     * @param configName The name of the config
-     * @param plugin     The plugin.
-     */
-    protected JSONStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final PluginLike plugin) {
-        super(Eco.getHandler().getConfigFactory().createLoadableJSONConfig(configName, plugin, "", plugin.getClass()));
-    }
-
-    /**
-     * Config implementation for configs present in the plugin's base directory (eg config.json, lang.json).
-     * <p>
-     * Does not automatically update.
-     *
-     * @param configName The name of the config
-     * @param plugin     The plugin.
-     */
-    protected JSONStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final EcoPlugin plugin) {
-        this(configName, (PluginLike) plugin);
-    }
-}

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

@@ -1,23 +0,0 @@
-package com.willfp.eco.core.config.json;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.config.json.wrapper.JSONConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.Map;
-
-/**
- * Raw JSON config with a map of values at its core.
- */
-public class JSONTransientConfig extends JSONConfigWrapper {
-    /**
-     * Config implementation for passing maps.
-     * <p>
-     * Does not automatically update.
-     *
-     * @param values The map of values.
-     */
-    public JSONTransientConfig(@NotNull final Map<String, Object> values) {
-        super(Eco.getHandler().getConfigFactory().createJSONConfig(values));
-    }
-}

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

@@ -1,48 +0,0 @@
-package com.willfp.eco.core.config.json.wrapper;
-
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.wrapper.ConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-
-/**
- * Wrapper to handle the backend JSON config implementations.
- */
-public abstract class JSONConfigWrapper extends ConfigWrapper<JSONConfig> implements JSONConfig {
-    /**
-     * Create a config wrapper.
-     *
-     * @param handle The handle.
-     */
-    protected JSONConfigWrapper(@NotNull final JSONConfig handle) {
-        super(handle);
-    }
-
-
-    @Override
-    public @NotNull List<JSONConfig> getSubsections(@NotNull final String path) {
-        return this.getHandle().getSubsections(path);
-    }
-
-    @Override
-    public @Nullable List<JSONConfig> getSubsectionsOrNull(@NotNull final String path) {
-        return this.getHandle().getSubsectionsOrNull(path);
-    }
-
-    @Override
-    public @NotNull JSONConfig getSubsection(@NotNull final String path) {
-        return this.getHandle().getSubsection(path);
-    }
-
-    @Override
-    public @Nullable JSONConfig getSubsectionOrNull(@NotNull final String path) {
-        return this.getHandle().getSubsectionOrNull(path);
-    }
-
-    @Override
-    public JSONConfig clone() {
-        return this.getHandle().clone();
-    }
-}

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

@@ -1,51 +0,0 @@
-package com.willfp.eco.core.config.json.wrapper;
-
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.interfaces.LoadableConfig;
-import org.apache.commons.lang.Validate;
-import org.jetbrains.annotations.NotNull;
-
-import java.io.File;
-import java.io.IOException;
-
-/**
- * Wrapper to handle the backend loadable JSON config implementations.
- */
-public abstract class LoadableJSONConfigWrapper extends JSONConfigWrapper implements LoadableConfig {
-    /**
-     * Create a config wrapper.
-     *
-     * @param handle The handle.
-     */
-    protected LoadableJSONConfigWrapper(@NotNull final JSONConfig handle) {
-        super(handle);
-
-        Validate.isTrue(handle instanceof LoadableConfig, "Wrapped config must be loadable!");
-    }
-
-
-    @Override
-    public void createFile() {
-        ((LoadableConfig) this.getHandle()).createFile();
-    }
-
-    @Override
-    public String getResourcePath() {
-        return ((LoadableConfig) this.getHandle()).getResourcePath();
-    }
-
-    @Override
-    public void save() throws IOException {
-        ((LoadableConfig) this.getHandle()).save();
-    }
-
-    @Override
-    public File getConfigFile() {
-        return ((LoadableConfig) this.getHandle()).getConfigFile();
-    }
-
-    @Override
-    public String getName() {
-        return ((LoadableConfig) this.getHandle()).getName();
-    }
-}

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

@@ -1,5 +1,6 @@
 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;
@@ -23,10 +24,15 @@ import java.lang.annotation.Target;
  * <p>
  * The second:
  * <pre>{@code
- * public static void update(EcoPlugin plugin) {}
+ * 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>
@@ -35,5 +41,6 @@ import java.lang.annotation.Target;
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.METHOD)
+@Documented
 public @interface ConfigUpdater {
 }

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

@@ -1,9 +1,12 @@
 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.JSONConfig;
-import org.bukkit.configuration.file.YamlConfiguration;
+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;
@@ -11,84 +14,74 @@ 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 updateBlacklist  Substring of keys to not add/remove keys for.
+     * @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.
      */
-    Config createUpdatableYamlConfig(@NotNull String configName,
-                                     @NotNull PluginLike plugin,
-                                     @NotNull String subDirectoryPath,
-                                     @NotNull Class<?> source,
-                                     boolean removeUnused,
-                                     @NotNull String... updateBlacklist);
-
-    /**
-     * 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 updateBlacklist  Substring of keys to not add/remove keys for.
-     * @return The config implementation.
-     */
-    JSONConfig createUpdatableJSONConfig(@NotNull String configName,
+    LoadableConfig createUpdatableConfig(@NotNull String configName,
                                          @NotNull PluginLike plugin,
                                          @NotNull String subDirectoryPath,
                                          @NotNull Class<?> source,
                                          boolean removeUnused,
+                                         @NotNull ConfigType type,
+                                         boolean requiresChangesToSave,
                                          @NotNull String... updateBlacklist);
 
     /**
-     * JSON loadable config.
+     * 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 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.
      */
-    JSONConfig createLoadableJSONConfig(@NotNull String configName,
+    LoadableConfig createLoadableConfig(@NotNull String configName,
                                         @NotNull PluginLike plugin,
                                         @NotNull String subDirectoryPath,
-                                        @NotNull Class<?> source);
+                                        @NotNull Class<?> source,
+                                        @NotNull ConfigType type,
+                                        boolean requiresChangesToSave);
 
     /**
-     * Yaml 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.
-     * @return The config implementation.
-     */
-    Config createLoadableYamlConfig(@NotNull String configName,
-                                    @NotNull PluginLike plugin,
-                                    @NotNull String subDirectoryPath,
-                                    @NotNull Class<?> source);
-
-    /**
-     * Yaml config.
+     * Create config.
      *
      * @param config The handle.
      * @return The config implementation.
      */
-    Config createYamlConfig(@NotNull YamlConfiguration config);
+    Config createConfig(@NotNull ConfigurationSection config);
 
     /**
-     * JSON config.
+     * Create config.
      *
      * @param values The values.
+     * @param type   The config type.
      * @return The config implementation.
      */
-    JSONConfig createJSONConfig(@NotNull Map<String, Object> values);
+    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

@@ -1,11 +1,15 @@
 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,
@@ -15,6 +19,7 @@ import java.util.List;
  *
  * @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,
@@ -38,6 +43,7 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
     }
 
     @Override
+    @Deprecated(since = "6.31.1", forRemoval = true)
     public void clearCache() {
         handle.clearCache();
     }
@@ -57,6 +63,12 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
         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);
@@ -68,70 +80,31 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
         handle.set(path, object);
     }
 
-    @Override
-    public @NotNull Config getSubsection(@NotNull final String path) {
-        return handle.getSubsection(path);
-    }
-
     @Override
     public @Nullable Config getSubsectionOrNull(@NotNull final String path) {
         return handle.getSubsectionOrNull(path);
     }
 
-    @Override
-    public int getInt(@NotNull final String path) {
-        return handle.getInt(path);
-    }
-
     @Override
     public @Nullable Integer getIntOrNull(@NotNull final String path) {
         return handle.getIntOrNull(path);
     }
 
-    @Override
-    public int getInt(@NotNull final String path,
-                      final int def) {
-        return handle.getInt(path, def);
-    }
-
-    @Override
-    public @NotNull List<Integer> getInts(@NotNull final String path) {
-        return handle.getInts(path);
-    }
-
     @Override
     public @Nullable List<Integer> getIntsOrNull(@NotNull final String path) {
         return handle.getIntsOrNull(path);
     }
 
-    @Override
-    public boolean getBool(@NotNull final String path) {
-        return handle.getBool(path);
-    }
-
     @Override
     public @Nullable Boolean getBoolOrNull(@NotNull final String path) {
         return handle.getBoolOrNull(path);
     }
 
-    @Override
-    public @NotNull List<Boolean> getBools(@NotNull final String path) {
-        return handle.getBools(path);
-    }
-
     @Override
     public @Nullable List<Boolean> getBoolsOrNull(@NotNull final String path) {
         return handle.getBoolsOrNull(path);
     }
 
-
-    @Override
-    public @NotNull String getString(@NotNull final String path,
-                                     final boolean format,
-                                     @NotNull final StringUtils.FormatOption option) {
-        return handle.getString(path, format, option);
-    }
-
     @Override
     public @Nullable String getStringOrNull(@NotNull final String path,
                                             final boolean format,
@@ -139,13 +112,6 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
         return handle.getStringOrNull(path, format, option);
     }
 
-    @Override
-    public @NotNull List<String> getStrings(@NotNull final String path,
-                                            final boolean format,
-                                            @NotNull final StringUtils.FormatOption option) {
-        return handle.getStrings(path, format, option);
-    }
-
     @Override
     public @Nullable List<String> getStringsOrNull(@NotNull final String path,
                                                    final boolean format,
@@ -153,31 +119,51 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
         return handle.getStringsOrNull(path, format, option);
     }
 
-    @Override
-    public double getDouble(@NotNull final String path) {
-        return handle.getDouble(path);
-    }
-
     @Override
     public @Nullable Double getDoubleOrNull(@NotNull final String path) {
         return handle.getDoubleOrNull(path);
     }
 
-    @Override
-    public @NotNull List<Double> getDoubles(@NotNull final String path) {
-        return handle.getDoubles(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.
      *

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/config/yaml/YamlBaseConfig.java

@@ -1,78 +0,0 @@
-package com.willfp.eco.core.config.yaml;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
-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 YamlBaseConfig extends LoadableYamlConfigWrapper {
-    /**
-     * @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.
-     */
-    protected YamlBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final PluginLike plugin,
-                             @NotNull final String... updateBlacklist) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableYamlConfig(
-                        configName,
-                        plugin,
-                        "",
-                        plugin.getClass(),
-                        removeUnused, updateBlacklist
-                )
-        );
-    }
-
-    /**
-     * @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.
-     */
-    protected YamlBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final PluginLike plugin) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableYamlConfig(
-                        configName,
-                        plugin,
-                        "",
-                        plugin.getClass(),
-                        removeUnused
-                )
-        );
-    }
-
-    /**
-     * @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.
-     */
-    protected YamlBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin,
-                             @NotNull final String... updateBlacklist) {
-        this(configName, removeUnused, (PluginLike) plugin, updateBlacklist);
-    }
-
-    /**
-     * @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.
-     */
-    protected YamlBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin) {
-        this(configName, removeUnused, (PluginLike) plugin);
-    }
-}

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

@@ -1,60 +0,0 @@
-package com.willfp.eco.core.config.yaml;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Config implementation for configs present in one of two places:
- * <ul>
- *     <li>Plugin base directory (eg config.yml, lang.yml)</li>
- *     <li>Other extension's configs</li>
- * </ul>
- * <p>
- * Automatically updates.
- */
-public abstract class YamlExtendableConfig extends LoadableYamlConfigWrapper {
-    /**
-     * @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 source           The class that owns the resource.
-     */
-    protected YamlExtendableConfig(@NotNull final String configName,
-                                   final boolean removeUnused,
-                                   @NotNull final PluginLike plugin,
-                                   @NotNull final Class<?> source,
-                                   @NotNull final String subDirectoryPath,
-                                   @NotNull final String... updateBlacklist) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableYamlConfig(
-                        configName,
-                        plugin,
-                        subDirectoryPath,
-                        source,
-                        removeUnused,
-                        updateBlacklist
-                )
-        );
-    }
-    /**
-     * @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 source           The class that owns the resource.
-     */
-    protected YamlExtendableConfig(@NotNull final String configName,
-                                   final boolean removeUnused,
-                                   @NotNull final EcoPlugin plugin,
-                                   @NotNull final Class<?> source,
-                                   @NotNull final String subDirectoryPath,
-                                   @NotNull final String... updateBlacklist) {
-        this(configName, removeUnused, (PluginLike) plugin, source, subDirectoryPath, updateBlacklist);
-    }
-}

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

@@ -1,38 +0,0 @@
-package com.willfp.eco.core.config.yaml;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Non-updatable yaml config that exists within a plugin jar.
- */
-public abstract class YamlStaticBaseConfig extends LoadableYamlConfigWrapper {
-    /**
-     * 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.
-     */
-    protected YamlStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final PluginLike plugin) {
-        super(Eco.getHandler().getConfigFactory().createLoadableYamlConfig(configName, plugin, "", plugin.getClass()));
-    }
-
-    /**
-     * 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.
-     */
-    protected YamlStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final EcoPlugin plugin) {
-        this(configName, (PluginLike) plugin);
-    }
-}

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

@@ -1,29 +0,0 @@
-package com.willfp.eco.core.config.yaml;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.config.yaml.wrapper.YamlConfigWrapper;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-
-import java.io.StringReader;
-
-/**
- * Config implementation for passing YamlConfigurations.
- * <p>
- * Does not automatically update.
- */
-public class YamlTransientConfig extends YamlConfigWrapper {
-    /**
-     * @param config     The YamlConfiguration handle.
-     */
-    public YamlTransientConfig(@NotNull final YamlConfiguration config) {
-        super(Eco.getHandler().getConfigFactory().createYamlConfig(config));
-    }
-
-    /**
-     * @param contents     The contents of the config.
-     */
-    public YamlTransientConfig(@NotNull final String contents) {
-        super(Eco.getHandler().getConfigFactory().createYamlConfig(YamlConfiguration.loadConfiguration(new StringReader(contents))));
-    }
-}

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

@@ -1,51 +0,0 @@
-package com.willfp.eco.core.config.yaml.wrapper;
-
-import com.willfp.eco.core.config.interfaces.Config;
-import com.willfp.eco.core.config.interfaces.LoadableConfig;
-import org.apache.commons.lang.Validate;
-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 LoadableYamlConfigWrapper extends YamlConfigWrapper implements LoadableConfig {
-    /**
-     * Create a config wrapper.
-     *
-     * @param handle The handle.
-     */
-    protected LoadableYamlConfigWrapper(@NotNull final Config handle) {
-        super(handle);
-
-        Validate.isTrue(handle instanceof LoadableConfig, "Wrapped config must be loadable!");
-    }
-
-
-    @Override
-    public void createFile() {
-        ((LoadableConfig) this.getHandle()).createFile();
-    }
-
-    @Override
-    public String getResourcePath() {
-        return ((LoadableConfig) this.getHandle()).getResourcePath();
-    }
-
-    @Override
-    public void save() throws IOException {
-        ((LoadableConfig) this.getHandle()).save();
-    }
-
-    @Override
-    public File getConfigFile() {
-        return ((LoadableConfig) this.getHandle()).getConfigFile();
-    }
-
-    @Override
-    public String getName() {
-        return ((LoadableConfig) this.getHandle()).getName();
-    }
-}

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

@@ -1,26 +0,0 @@
-package com.willfp.eco.core.config.yaml.wrapper;
-
-import com.willfp.eco.core.config.interfaces.Config;
-import com.willfp.eco.core.config.interfaces.WrappedYamlConfiguration;
-import com.willfp.eco.core.config.wrapper.ConfigWrapper;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Wrapper to handle the backend yaml config implementations.
- */
-public abstract class YamlConfigWrapper extends ConfigWrapper<Config> implements WrappedYamlConfiguration {
-    /**
-     * Create a config wrapper.
-     *
-     * @param handle The handle.
-     */
-    protected YamlConfigWrapper(@NotNull final Config handle) {
-        super(handle);
-    }
-
-    @Override
-    public YamlConfiguration getBukkitHandle() {
-        return ((WrappedYamlConfiguration) this.getHandle()).getBukkitHandle();
-    }
-}

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

@@ -1,7 +1,6 @@
 package com.willfp.eco.core.data;
 
 import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.data.keys.PersistentDataKey;
 import org.bukkit.OfflinePlayer;
 import org.jetbrains.annotations.NotNull;
 
@@ -12,26 +11,7 @@ import java.util.UUID;
  * <p>
  * Profiles save automatically, so there is no need to save after changes.
  */
-public interface PlayerProfile {
-    /**
-     * Write a key to a player's 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 a player's 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);
-
+public interface PlayerProfile extends Profile {
     /**
      * Load a player profile.
      *
@@ -51,6 +31,6 @@ public interface PlayerProfile {
      */
     @NotNull
     static PlayerProfile load(@NotNull final UUID uuid) {
-        return Eco.getHandler().getPlayerProfileHandler().load(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

@@ -1,15 +1,19 @@
 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 player profiles.
+ * API to handle profiles.
  */
-public interface PlayerProfileHandler {
+@ApiStatus.Internal
+@Eco.HandlerComponent
+public interface ProfileHandler {
     /**
      * Load a player profile.
      *
@@ -18,6 +22,13 @@ public interface PlayerProfileHandler {
      */
     PlayerProfile load(@NotNull UUID uuid);
 
+    /**
+     * Load the server profile.
+     *
+     * @return The profile.
+     */
+    ServerProfile loadServerProfile();
+
     /**
      * Unload a player profile from memory.
      * <p>
@@ -37,7 +48,7 @@ public interface PlayerProfileHandler {
      */
     @Deprecated
     default void savePlayer(@NotNull UUID uuid) {
-        this.saveKeysForPlayer(uuid, PersistentDataKey.values());
+        this.saveKeysFor(uuid, PersistentDataKey.values());
     }
 
     /**
@@ -48,8 +59,8 @@ public interface PlayerProfileHandler {
      * @param uuid The uuid.
      * @param keys The keys.
      */
-    void saveKeysForPlayer(@NotNull UUID uuid,
-                           @NotNull Set<PersistentDataKey<?>> keys);
+    void saveKeysFor(@NotNull UUID uuid,
+                     @NotNull Set<PersistentDataKey<?>> keys);
 
     /**
      * Save all player data.
@@ -57,7 +68,7 @@ public interface PlayerProfileHandler {
      * @param async If the saving should be done asynchronously.
      * @deprecated async is now handled automatically depending on implementation.
      */
-    @Deprecated
+    @Deprecated(forRemoval = true)
     default void saveAll(boolean async) {
         saveAll();
     }
@@ -66,8 +77,13 @@ public interface PlayerProfileHandler {
      * Save all player data.
      * <p>
      * Can run async if using MySQL.
+     *
+     * @deprecated Never used.
      */
-    void saveAll();
+    @Deprecated(since = "6.36.0", forRemoval = true)
+    default void saveAll() {
+        // Do nothing.
+    }
 
     /**
      * Commit all changes to the file.

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

@@ -1,12 +1,18 @@
 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.
@@ -21,4 +27,13 @@ public interface KeyRegistry {
      * @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

@@ -3,7 +3,9 @@ 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;
 
 /**
@@ -11,7 +13,7 @@ import java.util.Set;
  *
  * @param <T> The type of the data.
  */
-public class PersistentDataKey<T> {
+public final class PersistentDataKey<T> {
     /**
      * The key of the persistent data value.
      */
@@ -25,7 +27,7 @@ public class PersistentDataKey<T> {
     /**
      * The persistent data key type.
      */
-    private final PersistentDataKeyType type;
+    private final PersistentDataKeyType<T> type;
 
     /**
      * Create a new Persistent Data Key.
@@ -35,7 +37,7 @@ public class PersistentDataKey<T> {
      * @param defaultValue The default value.
      */
     public PersistentDataKey(@NotNull final NamespacedKey key,
-                             @NotNull final PersistentDataKeyType type,
+                             @NotNull final PersistentDataKeyType<T> type,
                              @NotNull final T defaultValue) {
         this.key = key;
         this.defaultValue = defaultValue;
@@ -53,15 +55,6 @@ public class PersistentDataKey<T> {
                 + '}';
     }
 
-    /**
-     * Get all persistent data keys.
-     *
-     * @return The keys.
-     */
-    public static Set<PersistentDataKey<?>> values() {
-        return Eco.getHandler().getKeyRegistry().getRegisteredKeys();
-    }
-
     /**
      * Get the key.
      *
@@ -85,7 +78,70 @@ public class PersistentDataKey<T> {
      *
      * @return The key type.
      */
-    public PersistentDataKeyType getType() {
+    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

@@ -1,26 +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 enum PersistentDataKeyType {
+public final class PersistentDataKeyType<T> {
+    /**
+     * The registered key types.
+     */
+    private static final List<PersistentDataKeyType<?>> VALUES = new ArrayList<>();
+
     /**
      * String.
      */
-    STRING,
+    public static final PersistentDataKeyType<String> STRING = new PersistentDataKeyType<>(String.class, "STRING");
 
     /**
      * Boolean.
      */
-    BOOLEAN,
+    public static final PersistentDataKeyType<Boolean> BOOLEAN = new PersistentDataKeyType<>(Boolean.class, "BOOLEAN");
 
     /**
-     * Integer.
+     * Int.
      */
-    INT,
+    public static final PersistentDataKeyType<Integer> INT = new PersistentDataKeyType<>(Integer.class, "INT");
 
     /**
      * Double.
      */
-    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

@@ -60,7 +60,7 @@ public final class Display {
      * @return The ItemStack.
      */
     public static ItemStack displayAndFinalize(@NotNull final ItemStack itemStack,
-                                        @Nullable final Player player) {
+                                               @Nullable final Player player) {
         return finalize(display(itemStack, player));
     }
 
@@ -113,52 +113,6 @@ public final class Display {
         handler.registerDisplayModule(module);
     }
 
-    /**
-     * Initialize the display system.
-     *
-     * @param handler The handler.
-     */
-    @ApiStatus.Internal
-    public static void init(@NotNull final DisplayHandler handler) {
-        if (Display.handler != null) {
-            throw new IllegalArgumentException("Already Initialized!");
-        }
-        Display.handler = handler;
-    }
-
-    /**
-     * Extremely janky method - also internal, so don't use it. <b>This method is
-     * NOT part of the API and may be removed at any time!</b>
-     * <p>
-     * This calls a display module with the specified parameters, now
-     * you might ask why I need a static java method when the DisplayHandler
-     * implementation could just call it itself? Well, kotlin doesn't really
-     * like dealing with vararg ambiguity, and so while kotlin can't figure out
-     * what is and isn't a vararg when I call display with a player, java can.
-     * <p>
-     * Because of this, I need to have this part of the code in java.
-     *
-     * <b>Don't call this method as part of your plugins!</b>
-     * <p>
-     * No, seriously - don't. This skips a bunch of checks and you'll almost
-     * definitely break something.
-     *
-     * @param module    The display module.
-     * @param itemStack The ItemStack.
-     * @param player    The player.
-     * @param args      The args.
-     */
-    @ApiStatus.Internal
-    public static void callDisplayModule(@NotNull final DisplayModule module,
-                                         @NotNull final ItemStack itemStack,
-                                         @Nullable final Player player,
-                                         @NotNull final Object... args) {
-        module.display(itemStack, args);
-        if (player != null) {
-            module.display(itemStack, player, args);
-        }
-    }
-
     /**
      * Set the display handler.
      * <p>

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

@@ -1,13 +1,17 @@
 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.

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

@@ -14,7 +14,7 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
     /**
      * The priority of the module.
      */
-    private final DisplayPriority priority;
+    private final int weight;
 
     /**
      * Create a new display module.
@@ -25,7 +25,19 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
     protected DisplayModule(@NotNull final EcoPlugin plugin,
                             @NotNull final DisplayPriority priority) {
         super(plugin);
-        this.priority = priority;
+        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;
     }
 
     /**
@@ -52,6 +64,21 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
         // 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.
      *
@@ -84,8 +111,25 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
      * Get the display priority.
      *
      * @return The priority.
+     * @deprecated Use getWeight instead.
      */
+    @Deprecated(since = "6.35.0", forRemoval = true)
     public DisplayPriority getPriority() {
-        return this.priority;
+        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

@@ -4,23 +4,51 @@ package com.willfp.eco.core.display;
  * The priority (order) of display modules.
  */
 public enum DisplayPriority {
+    /**
+     * Custom weight.
+     */
+    CUSTOM(250),
+
     /**
      * Ran first.
      */
-    LOWEST,
+    LOWEST(100),
 
     /**
      * Ran second.
      */
-    LOW,
+    LOW(200),
 
     /**
      * Ran third.
      */
-    HIGH,
+    HIGH(300),
 
     /**
      * Ran last.
      */
-    HIGHEST
+    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/DropQueueFactory.java

@@ -1,11 +1,15 @@
 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.

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

@@ -1,7 +1,9 @@
 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;
@@ -9,6 +11,8 @@ import java.util.Collection;
 /**
  * Internal interface for backend DropQueue implementations.
  */
+@ApiStatus.Internal
+@Eco.HandlerComponent
 public interface InternalDropQueue {
     /**
      * Add item to 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");
+        }
+    }
+}