Kill half of enemies in room

src/items/effect/EffectItem.cs

@@ -43,6 +43,8 @@ public partial class EffectItem : Node3D, IUsableItem
       Game.DoubleEXP(TimeSpan.FromSeconds(30));
     if (_effectItemStats.UsableItemTags.Contains(UsableItemTag.TeleportAllEnemiesToRoom))
       TeleportEnemiesToCurrentRoom();
+    if (_effectItemStats.UsableItemTags.Contains(UsableItemTag.KillHalfEnemiesInRoom))
+      KillHalfEnemiesInRoom();
   }
 
   public void SetItemStats(InventoryItemStats inventoryItemStats)
@@ -88,4 +90,19 @@ public partial class EffectItem : Node3D, IUsableItem
       enemy.SetEnemyGlobalPosition(randomSpawnPoint.GlobalPosition);
     }
   }
+
+  private void KillHalfEnemiesInRoom()
+  {
+    var currentRoom = Player.GetCurrentRoom();
+    if (currentRoom is not MonsterRoom)
+      return;
+
+    var currentMonsterRoom = (MonsterRoom)currentRoom;
+    var enemyList = currentMonsterRoom.GetEnemiesInCurrentRoom().ToList();
+    var enemiesToKill = enemyList.Count / 2;
+    for (var i = 0; i < enemiesToKill; i++)
+    {
+      enemyList[i].Die();
+    }
+  }
 }

src/items/effect/resources/DevicBalance.tres

@@ -0,0 +1,18 @@
+[gd_resource type="Resource" script_class="EffectItemStats" load_steps=3 format=3 uid="uid://cxfu683mhpu6v"]
+
+[ext_resource type="Script" uid="uid://b5w4iw4iqmxtn" path="res://src/items/effect/EffectItemStats.cs" id="1_50lqu"]
+[ext_resource type="Texture2D" uid="uid://c7v5pm32sedkg" path="res://src/items/effect/textures/entropic seal.PNG" id="1_j7j7j"]
+
+[resource]
+script = ExtResource("1_50lqu")
+UsableItemTags = Array[int]([6])
+Name = "Devic Balance"
+Description = "Kill half of all enemies in current room."
+Texture = ExtResource("1_j7j7j")
+SpawnRate = 0.5
+ThrowSpeed = 12.0
+HealHPAmount = 0
+HealVTAmount = 0
+ThrowDamage = 5
+ItemTags = Array[int]([])
+metadata/_custom_type_script = "uid://b5w4iw4iqmxtn"