diff --git a/eco-api/src/main/java/com/willfp/eco/core/entities/ai/EntityGoals.java b/eco-api/src/main/java/com/willfp/eco/core/entities/ai/EntityGoals.java
new file mode 100644
index 00000000..10fda81b
--- /dev/null
+++ b/eco-api/src/main/java/com/willfp/eco/core/entities/ai/EntityGoals.java
@@ -0,0 +1,45 @@
+package com.willfp.eco.core.entities.ai;
+
+import com.google.common.collect.HashBiMap;
+import com.willfp.eco.core.entities.ai.entity.EntityGoalAvoidEntity;
+import com.willfp.eco.core.serialization.KeyedDeserializer;
+import org.bukkit.NamespacedKey;
+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();
+
+    /**
+     * minecraft:avoid_entity.
+     */
+    public static final KeyedDeserializer<EntityGoalAvoidEntity> AVOID_ENTITY = register(EntityGoalAvoidEntity.DESERIALIZER);
+
+    /**
+     * Get deserializer by key.
+     *
+     * @param key The key.
+     * @return The deserializer, or null if not found.
+     */
+    @Nullable
+    public static KeyedDeserializer<? extends EntityGoal<?>> getByKey(@NotNull final NamespacedKey key) {
+        return BY_KEY.get(key);
+    }
+
+    private 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");
+    }
+}
diff --git a/eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalAvoidEntity.java b/eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalAvoidEntity.java
index b852699d..7d887ac4 100644
--- a/eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalAvoidEntity.java
+++ b/eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalAvoidEntity.java
@@ -1,10 +1,18 @@
 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.EntityType;
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.Mob;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
+import java.util.Objects;
 import java.util.function.Predicate;
 
 /**
@@ -23,5 +31,53 @@ public record EntityGoalAvoidEntity(
         double fastSpeed,
         @NotNull Predicate<LivingEntity> filter
 ) implements EntityGoal<Mob> {
+    /**
+     * The deserializer for the goal.
+     */
+    public static final KeyedDeserializer<EntityGoalAvoidEntity> DESERIALIZER = new Deserializer();
 
+    @SuppressWarnings("unchecked")
+    private static final class Deserializer implements KeyedDeserializer<EntityGoalAvoidEntity> {
+        @Override
+        @Nullable
+        public EntityGoalAvoidEntity deserialize(@NotNull final Config config) {
+            if (!(
+                    config.has("avoidClass")
+                            && config.has("fleeDistance")
+                            && config.has("slowSpeed")
+                            && config.has("fastSpeed")
+                            && config.has("filter")
+            )) {
+                return null;
+            }
+
+            try {
+                TestableEntity filter = Entities.lookup(config.getString("filter"));
+
+                return new EntityGoalAvoidEntity(
+                        (Class<? extends LivingEntity>)
+                                Objects.requireNonNull(
+                                        EntityType.valueOf(config.getString("avoidClass").toUpperCase()).getEntityClass()
+                                ),
+                        config.getDouble("fleeDistance"),
+                        config.getDouble("slowSpeed"),
+                        config.getDouble("fastSpeed"),
+                        filter::matches
+                );
+            } 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");
+        }
+    }
 }
diff --git a/eco-api/src/main/java/com/willfp/eco/core/lookup/Testable.java b/eco-api/src/main/java/com/willfp/eco/core/lookup/Testable.java
index 5b292fbd..ac6e5301 100644
--- a/eco-api/src/main/java/com/willfp/eco/core/lookup/Testable.java
+++ b/eco-api/src/main/java/com/willfp/eco/core/lookup/Testable.java
@@ -2,12 +2,14 @@ package com.willfp.eco.core.lookup;
 
 import org.jetbrains.annotations.Nullable;
 
+import java.util.function.Predicate;
+
 /**
  * Interface for testing if any object matches another object.
  *
  * @param <T> The type of object.
  */
-public interface Testable<T> {
+public interface Testable<T> extends Predicate<T> {
     /**
      * If object matches the test.
      *
@@ -15,4 +17,9 @@ public interface Testable<T> {
      * @return If matches.
      */
     boolean matches(@Nullable T other);
+
+    @Override
+    default boolean test(@Nullable T other) {
+        return this.matches(other);
+    }
 }
diff --git a/eco-api/src/main/java/com/willfp/eco/core/serialization/ConfigDeserializer.java b/eco-api/src/main/java/com/willfp/eco/core/serialization/ConfigDeserializer.java
new file mode 100644
index 00000000..283aefe0
--- /dev/null
+++ b/eco-api/src/main/java/com/willfp/eco/core/serialization/ConfigDeserializer.java
@@ -0,0 +1,21 @@
+package com.willfp.eco.core.serialization;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Deserialize objects from configs.
+ *
+ * @param <T> The type of object to deserialize.
+ */
+public interface ConfigDeserializer<T> {
+    /**
+     * Deserialize a config to an object.
+     *
+     * @param config The config.
+     * @return The object, or null if invalid.
+     */
+    @Nullable
+    T deserialize(@NotNull Config config);
+}
diff --git a/eco-api/src/main/java/com/willfp/eco/core/serialization/ConfigSerializer.java b/eco-api/src/main/java/com/willfp/eco/core/serialization/ConfigSerializer.java
new file mode 100644
index 00000000..c1667fb9
--- /dev/null
+++ b/eco-api/src/main/java/com/willfp/eco/core/serialization/ConfigSerializer.java
@@ -0,0 +1,20 @@
+package com.willfp.eco.core.serialization;
+
+import com.willfp.eco.core.config.interfaces.Config;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Serialize objects to configs.
+ *
+ * @param <T> The type of object to serialize.
+ */
+public interface ConfigSerializer<T> {
+    /**
+     * Serialize an object to a config.
+     *
+     * @param obj The object.
+     * @return The config.
+     */
+    @NotNull
+    Config serialize(@NotNull T obj);
+}
diff --git a/eco-api/src/main/java/com/willfp/eco/core/serialization/KeyedDeserializer.java b/eco-api/src/main/java/com/willfp/eco/core/serialization/KeyedDeserializer.java
new file mode 100644
index 00000000..c6ad705d
--- /dev/null
+++ b/eco-api/src/main/java/com/willfp/eco/core/serialization/KeyedDeserializer.java
@@ -0,0 +1,14 @@
+package com.willfp.eco.core.serialization;
+
+import org.bukkit.Keyed;
+
+/**
+ * Deserialize objects from configs.
+ * <p>
+ * Has a key.
+ *
+ * @param <T> The type of object to deserialize.
+ */
+public interface KeyedDeserializer<T> extends ConfigDeserializer<T>, Keyed {
+
+}
diff --git a/eco-api/src/main/java/com/willfp/eco/core/serialization/KeyedSerializer.java b/eco-api/src/main/java/com/willfp/eco/core/serialization/KeyedSerializer.java
new file mode 100644
index 00000000..e217f99f
--- /dev/null
+++ b/eco-api/src/main/java/com/willfp/eco/core/serialization/KeyedSerializer.java
@@ -0,0 +1,14 @@
+package com.willfp.eco.core.serialization;
+
+import org.bukkit.Keyed;
+
+/**
+ * Serialize objects to configs.
+ * <p>
+ * Has a key.
+ *
+ * @param <T> The type of object to serialize.
+ */
+public interface KeyedSerializer<T> extends ConfigSerializer<T>, Keyed {
+
+}