Passive mobs will now correctly flee from players that have been wearing the alicorn amulet at least 1 day

src/main/java/com/minelittlepony/unicopia/client/render/IcarusWingsFeatureRenderer.java

@@ -1,7 +1,7 @@
 package com.minelittlepony.unicopia.client.render;
 
 import com.minelittlepony.unicopia.Unicopia;
-import com.minelittlepony.unicopia.item.UItems;
+import com.minelittlepony.unicopia.entity.AmuletSelectors;
 
 import net.minecraft.client.render.entity.feature.FeatureRendererContext;
 import net.minecraft.client.render.entity.model.BipedEntityModel;
@@ -18,7 +18,7 @@ public class IcarusWingsFeatureRenderer<E extends LivingEntity> extends WingsFea
 
     @Override
     protected boolean canRender(E entity) {
-        return !super.canRender(entity) && UItems.PEGASUS_AMULET.isApplicable(entity);
+        return !super.canRender(entity) && AmuletSelectors.PEGASUS_AMULET.test(entity);
     }
 
     @Override

src/main/java/com/minelittlepony/unicopia/entity/AmuletSelectors.java

@@ -8,4 +8,10 @@ import net.minecraft.entity.LivingEntity;
 
 public interface AmuletSelectors {
     Predicate<LivingEntity> ALICORN_AMULET = UItems.ALICORN_AMULET::isApplicable;
+    Predicate<LivingEntity> PEGASUS_AMULET = UItems.PEGASUS_AMULET::isApplicable;
+
+    Predicate<LivingEntity> ALICORN_AMULET_AFTER_1_DAYS = ALICORN_AMULET.and(ItemTracker.wearing(UItems.ALICORN_AMULET, ItemTracker.after(ItemTracker.DAYS)));
+    Predicate<LivingEntity> ALICORN_AMULET_AFTER_2_DAYS = ALICORN_AMULET.and(ItemTracker.wearing(UItems.ALICORN_AMULET, ItemTracker.after(2 * ItemTracker.DAYS)));
+    Predicate<LivingEntity> ALICORN_AMULET_AFTER_3_DAYS = ALICORN_AMULET.and(ItemTracker.wearing(UItems.ALICORN_AMULET, ItemTracker.after(3 * ItemTracker.DAYS)));
+    Predicate<LivingEntity> ALICORN_AMULET_AFTER_4_DAYS = ALICORN_AMULET.and(ItemTracker.wearing(UItems.ALICORN_AMULET, ItemTracker.after(3 * ItemTracker.DAYS)));
 }

src/main/java/com/minelittlepony/unicopia/entity/Creature.java

@@ -130,7 +130,7 @@ public class Creature extends Living<LivingEntity> implements WeaklyOwned<Living
             goals.add(1, new FleeEntityGoal<>(mob, LivingEntity.class, 10, 1.5, 1.9, AmuletSelectors.ALICORN_AMULET));
         }
         if (entity instanceof PassiveEntity mob) {
-            goals.add(1, new FleeEntityGoal<>(mob, LivingEntity.class, 10, 1.1, 1.7, AmuletSelectors.ALICORN_AMULET));
+            goals.add(1, new FleeEntityGoal<>(mob, LivingEntity.class, 10, 1.1, 1.7, AmuletSelectors.ALICORN_AMULET_AFTER_1_DAYS));
         }
     }
 

src/main/java/com/minelittlepony/unicopia/entity/ItemTracker.java

@@ -1,10 +1,12 @@
 package com.minelittlepony.unicopia.entity;
 
 import java.util.*;
+import java.util.function.Predicate;
 import java.util.stream.Stream;
 
 import com.minelittlepony.unicopia.util.NbtSerialisable;
 
+import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemConvertible;
 import net.minecraft.item.ItemStack;
@@ -20,6 +22,26 @@ public class ItemTracker implements NbtSerialisable {
 
     private final Map<Trackable, Long> items = new HashMap<>();
 
+    public static Predicate<LivingEntity> wearing(Trackable charm, Predicate<Long> range) {
+        return e -> Living.getOrEmpty(e)
+                    .map(Living::getArmour)
+                    .map(a -> a.getTicks(charm))
+                    .filter(range)
+                    .isPresent();
+    }
+
+    public static Predicate<Long> between(long minTime, long maxTime) {
+        return before(maxTime).and(after(minTime));
+    }
+
+    public static Predicate<Long> before(long maxTime) {
+        return ticks -> ticks <= maxTime;
+    }
+
+    public static Predicate<Long> after(long maxTime) {
+        return ticks -> ticks <= maxTime;
+    }
+
     public void update(Living<?> living, Stream<ItemStack> stacks) {
         final Set<Trackable> found = new HashSet<>();
         final Set<ItemStack> foundStacks = new HashSet<>();

src/main/java/com/minelittlepony/unicopia/entity/Living.java

@@ -273,8 +273,12 @@ public abstract class Living<T extends LivingEntity> implements Equine<T>, Caste
         updateVelocity(entity);
     }
 
+    public static Optional<Living<?>> getOrEmpty(LivingEntity entity) {
+        return PonyContainer.of(entity).map(a -> a instanceof Living ? (Living<?>)a.get() : null);
+    }
+
     public static Living<?> living(Entity entity) {
-        return PonyContainer.of(entity).map(a -> a instanceof Living ? (Living<?>)a.get() : null).orElse(null);
+        return entity instanceof LivingEntity ? getOrEmpty((LivingEntity)entity).orElse(null) : null;
     }
 
     public static void updateVelocity(Entity entity) {

src/main/java/com/minelittlepony/unicopia/entity/player/Pony.java

@@ -164,7 +164,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
 
     @Override
     public Race getSpecies() {
-        if (UItems.ALICORN_AMULET.isApplicable(entity)) {
+        if (AmuletSelectors.ALICORN_AMULET.test(entity)) {
             return Race.ALICORN;
         }
 
@@ -504,7 +504,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
 
     public Optional<Text> trySleep(BlockPos pos) {
 
-        if (UItems.ALICORN_AMULET.isApplicable(entity)) {
+        if (AmuletSelectors.ALICORN_AMULET.test(entity)) {
             return Optional.of(Text.translatable("block.unicopia.bed.not_tired"));
         }