diff --git a/paper-api/src/main/java/org/bukkit/entity/Entity.java b/paper-api/src/main/java/org/bukkit/entity/Entity.java
index 2c68aae864a7..66d8d1349c6a 100644
--- a/paper-api/src/main/java/org/bukkit/entity/Entity.java
+++ b/paper-api/src/main/java/org/bukkit/entity/Entity.java
@@ -5,6 +5,8 @@
 import java.util.UUID;
 import io.papermc.paper.datacomponent.DataComponentView;
 import io.papermc.paper.entity.LookAnchor;
+import java.util.function.Predicate;
+import net.kyori.adventure.key.Key;
 import net.kyori.adventure.util.TriState;
 import org.bukkit.Chunk; // Paper
 import org.bukkit.EntityEffect;
@@ -1322,4 +1324,39 @@ default boolean spawnAt(@NotNull Location location) {
      */
     void broadcastHurtAnimation(@NotNull java.util.Collection<Player> players);
     // Paper end - broadcast hurt animation
+
+    /**
+     * Gets if the entity is allied to the given entity.
+     *
+     * @param other the other entity
+     * @return true if the entity is allied to the given entity
+     */
+    boolean isAlliedTo(@NotNull Entity other);
+
+    /**
+     * Gets the current additional rule of alliance with any entity.
+     * <br>
+     * This is an additional rule from the vanilla behaviour for any entity, like share a team.
+     * <br>
+     * This rule is not (currently) persistent.
+     *
+     * @return additional rule of alliance
+     * @see #addAdditionalAlliedRule(Key, Predicate)
+     */
+    @Nullable Predicate<Entity> getAdditionalAlliedRule(@NotNull Key key);
+
+    /**
+     * Sets the current additional rule of alliance with any entity.
+     *
+     * @param key the key of the additional rule
+     * @param predicate the additional rule of alliance with any entity
+     */
+    void addAdditionalAlliedRule(@NotNull Key key, @NotNull Predicate<Entity> predicate);
+
+    /**
+     * Remove the additional rule of alliance with any entity.
+     *
+     * @param key the key of the additional rule
+     */
+    void removeAdditionalAlliedRule(@NotNull Key key);
 }
diff --git a/paper-server/patches/features/0001-Moonrise-optimisation-patches.patch b/paper-server/patches/features/0001-Moonrise-optimisation-patches.patch
index 2f5fc143544b..3da8abd7020d 100644
--- a/paper-server/patches/features/0001-Moonrise-optimisation-patches.patch
+++ b/paper-server/patches/features/0001-Moonrise-optimisation-patches.patch
@@ -28453,7 +28453,7 @@ index c974b6cafb1f6aa2a57cfdc8a39c887f02f42b1d..ec40f02032f965f548b0c0a29aa9d9bb
          // Paper start - PlayerChunkLoadEvent
          if (io.papermc.paper.event.packet.PlayerChunkLoadEvent.getHandlerList().getRegisteredListeners().length > 0) {
 diff --git a/net/minecraft/server/network/config/PrepareSpawnTask.java b/net/minecraft/server/network/config/PrepareSpawnTask.java
-index 83af9ee3ba150da85b9b694cd76a5fabb5b2d8ef..1fb40837bd02672850ec9adc2797190df22b33fc 100644
+index b5d993095aa77bb132c513f73dbf6d2afb2e3943..8b318dd8aa918284c5fa89e990b13bec425102cb 100644
 --- a/net/minecraft/server/network/config/PrepareSpawnTask.java
 +++ b/net/minecraft/server/network/config/PrepareSpawnTask.java
 @@ -171,7 +171,7 @@ public class PrepareSpawnTask implements ConfigurationTask {
@@ -28885,7 +28885,7 @@ index 1ceb7e4a3abd4d9de5133d182d3267d2164918f6..eb2fa32cff6824c14f865c8731df7d08
 +    // Paper end - block counting
  }
 diff --git a/net/minecraft/world/entity/Entity.java b/net/minecraft/world/entity/Entity.java
-index 29896cb17fcf8ab967a937e9b0e102a8354b6889..e087d5596979044fe7fbcf7f2cccdae4e81a3d3a 100644
+index 67a0481c2dbfe1c6692a0ced2179d272100b1979..2d7616e6d5a425677c1057b3e16325150cc87ae6 100644
 --- a/net/minecraft/world/entity/Entity.java
 +++ b/net/minecraft/world/entity/Entity.java
 @@ -167,7 +167,7 @@ public abstract class Entity
diff --git a/paper-server/patches/features/0005-Entity-Activation-Range-2.0.patch b/paper-server/patches/features/0005-Entity-Activation-Range-2.0.patch
index bf988f7f15f9..270fba53b128 100644
--- a/paper-server/patches/features/0005-Entity-Activation-Range-2.0.patch
+++ b/paper-server/patches/features/0005-Entity-Activation-Range-2.0.patch
@@ -462,7 +462,7 @@ index 0df8332933203a904bd9ef9efb3c9bce21e65441..1a502cbd8acea9420fa6dd8d716018b5
      public void tick() {
          super.tick();
 diff --git a/net/minecraft/world/entity/Entity.java b/net/minecraft/world/entity/Entity.java
-index e087d5596979044fe7fbcf7f2cccdae4e81a3d3a..fea6c3b48c4eb162fbdc099fa775bc3161a4dd4e 100644
+index 2d7616e6d5a425677c1057b3e16325150cc87ae6..7ab3cf2fb50804c314df576743d19b0aba1ee8bb 100644
 --- a/net/minecraft/world/entity/Entity.java
 +++ b/net/minecraft/world/entity/Entity.java
 @@ -382,6 +382,15 @@ public abstract class Entity
@@ -817,7 +817,7 @@ index 3a590d4dc980a2912e9cc043d8c8db4cf9d60803..06ab7c48b18c03af494ab10fc2b584ce
 +
  }
 diff --git a/net/minecraft/world/level/Level.java b/net/minecraft/world/level/Level.java
-index b8d56c7a14521cb77ba2cf619be826fb06be81da..2b3ec0a012918815ed0eda8b40647c2274a5b418 100644
+index c0f901c4ac61a0aa2b480f102feb3669b111f4c0..07c301ba02c7f2c032a29a0ae3bdf95fc522c03b 100644
 --- a/net/minecraft/world/level/Level.java
 +++ b/net/minecraft/world/level/Level.java
 @@ -155,6 +155,12 @@ public abstract class Level implements LevelAccessor, AutoCloseable, ca.spottedl
diff --git a/paper-server/patches/features/0025-Optimise-EntityScheduler-ticking.patch b/paper-server/patches/features/0025-Optimise-EntityScheduler-ticking.patch
index c929667c8ef8..b78ca6ef9f6c 100644
--- a/paper-server/patches/features/0025-Optimise-EntityScheduler-ticking.patch
+++ b/paper-server/patches/features/0025-Optimise-EntityScheduler-ticking.patch
@@ -20,7 +20,7 @@ index 2bc436cdf5180a7943c45fabb9fbbedae6f7db56..f312a7f5b1b2a777ab36b94ce7cbf387
  
      @Override
 diff --git a/net/minecraft/server/MinecraftServer.java b/net/minecraft/server/MinecraftServer.java
-index 8c4b40362f77cdea6e57315a6639006ac7ab27c7..a5217deb236ee922d020a7a6a03141a5f67acd77 100644
+index 72bc7f6efc8f23d6ff31d2dabb13490655c58074..9a438cbdb05c7a8c33804c3b66ff42f357a96bc3 100644
 --- a/net/minecraft/server/MinecraftServer.java
 +++ b/net/minecraft/server/MinecraftServer.java
 @@ -1794,32 +1794,22 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
@@ -66,7 +66,7 @@ index 8c4b40362f77cdea6e57315a6639006ac7ab27c7..a5217deb236ee922d020a7a6a03141a5
          io.papermc.paper.adventure.providers.ClickCallbackProviderImpl.ADVENTURE_CLICK_MANAGER.handleQueue(this.tickCount); // Paper
          io.papermc.paper.adventure.providers.ClickCallbackProviderImpl.DIALOG_CLICK_MANAGER.handleQueue(this.tickCount); // Paper
 diff --git a/net/minecraft/world/entity/Entity.java b/net/minecraft/world/entity/Entity.java
-index fea6c3b48c4eb162fbdc099fa775bc3161a4dd4e..82f6582a92f17bdeb3218c4c1fcac86981fd9c37 100644
+index 7ab3cf2fb50804c314df576743d19b0aba1ee8bb..960ab20654b054e1518c48be3434465a1ca28803 100644
 --- a/net/minecraft/world/entity/Entity.java
 +++ b/net/minecraft/world/entity/Entity.java
 @@ -5146,6 +5146,11 @@ public abstract class Entity
diff --git a/paper-server/patches/sources/net/minecraft/world/entity/Entity.java.patch b/paper-server/patches/sources/net/minecraft/world/entity/Entity.java.patch
index cfc2d384c698..b11fb78ca248 100644
--- a/paper-server/patches/sources/net/minecraft/world/entity/Entity.java.patch
+++ b/paper-server/patches/sources/net/minecraft/world/entity/Entity.java.patch
@@ -1307,6 +1307,15 @@
          return this.level().getScoreboard().getPlayersTeam(this.getScoreboardName());
      }
  
+@@ -2699,7 +_,7 @@
+     }
+ 
+     protected boolean considersEntityAsAlly(final Entity other) {
+-        return this.isAlliedTo(other.getTeam());
++        return this.isAlliedTo(other.getTeam()) || this.getBukkitEntity().considersEntityAsAlly0(other.getBukkitEntity()); // Paper - Allies API
+     }
+ 
+     public boolean isAlliedTo(final @Nullable Team other) {
 @@ -2707,7 +_,11 @@
      }
  
diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
index 2f40476da09c..77c4106c1ed5 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -10,10 +10,14 @@
 import io.papermc.paper.entity.LookAnchor;
 import io.papermc.paper.entity.TeleportFlag;
 import java.util.EnumSet;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
+import java.util.function.Predicate;
+import net.kyori.adventure.key.Key;
 import net.kyori.adventure.pointer.PointersSupplier;
 import net.kyori.adventure.util.TriState;
 import net.md_5.bungee.api.chat.BaseComponent;
@@ -97,6 +101,7 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
     protected Entity entity;
     private final EntityType entityType;
     private EntityDamageEvent lastDamageEvent;
+    private final Map<Key, Predicate<org.bukkit.entity.Entity>> additionalAlliedRules = new HashMap<>();
     private final CraftPersistentDataContainer persistentDataContainer = new CraftPersistentDataContainer(CraftEntity.DATA_TYPE_REGISTRY);
     // Paper start - Folia shedulers
     public final io.papermc.paper.threadedregions.EntityScheduler taskScheduler = new io.papermc.paper.threadedregions.EntityScheduler(this);
@@ -1331,4 +1336,29 @@ public boolean hasData(final @NotNull DataComponentType type) {
         return this.entity.get(io.papermc.paper.datacomponent.PaperDataComponentType.bukkitToMinecraft(type)) != null;
     }
 
+    public boolean considersEntityAsAlly0(org.bukkit.entity.Entity entity) {
+        return this.additionalAlliedRules.values().stream().anyMatch(entityPredicate -> entityPredicate.test(entity));
+    }
+
+    @Override
+    public boolean isAlliedTo(@NotNull org.bukkit.entity.Entity other) {
+        Preconditions.checkArgument(other != null, "other cannot be null");
+        return this.getHandle().isAlliedTo(((CraftEntity)other).getHandle());
+    }
+
+    @Override
+    public Predicate<org.bukkit.entity.Entity> getAdditionalAlliedRule(@NotNull Key key) {
+        return this.additionalAlliedRules.get(key);
+    }
+
+    @Override
+    public void addAdditionalAlliedRule(@NotNull Key key, @NotNull Predicate<org.bukkit.entity.Entity> predicate) {
+        this.additionalAlliedRules.put(key, predicate);
+    }
+
+    @Override
+    public void removeAdditionalAlliedRule(@NotNull Key key) {
+        this.additionalAlliedRules.remove(key);
+    }
+
 }