diff --git a/Assets/Design/Levels/WaveConfig_1_1.asset b/Assets/Design/Levels/WaveConfig_1_1.asset
index 26c4095..c24e72b 100644
--- a/Assets/Design/Levels/WaveConfig_1_1.asset
+++ b/Assets/Design/Levels/WaveConfig_1_1.asset
@@ -20,16 +20,20 @@ MonoBehaviour:
     - _enemy: {fileID: 80204295746100150, guid: 2419a879bd4e47d4fa8b30de0fcdde42, type: 3}
       _count: 2
     triggerTime: 0.25
+    dropsMonsterCore: 1
   - groupSpawn:
     - _enemy: {fileID: 80204295746100150, guid: 2419a879bd4e47d4fa8b30de0fcdde42, type: 3}
       _count: 9
     triggerTime: 1.5
+    dropsMonsterCore: 1
   - groupSpawn:
     - _enemy: {fileID: 80204295746100150, guid: 1be769d6ef642314b8846bed35e7297c, type: 3}
       _count: 7
     triggerTime: 2
+    dropsMonsterCore: 0
   - groupSpawn:
     - _enemy: {fileID: 80204295746100150, guid: 1be769d6ef642314b8846bed35e7297c, type: 3}
       _count: 14
     triggerTime: 3
+    dropsMonsterCore: 0
   _gameDuration: 3
diff --git a/Assets/Scripts/LevelConfig/WaveObserver.cs b/Assets/Scripts/LevelConfig/WaveObserver.cs
index ac1ec98..bccfed8 100644
--- a/Assets/Scripts/LevelConfig/WaveObserver.cs
+++ b/Assets/Scripts/LevelConfig/WaveObserver.cs
@@ -249,15 +249,59 @@ public class WaveObserver : Singleton<WaveObserver>
     private void CycleRows(List<int> usedRows, List<EnemyType> currentGroup, int groupIndex)
     {
         System.Random rand = new System.Random();
+        bool dropsCore = _monsterCoreGroups != null && _monsterCoreGroups.Count > _currentGroupIndex && _monsterCoreGroups[_currentGroupIndex];
+        int totalToSpawn = _copyGroupSpawn[_currentGroupIndex][groupIndex];
+        int monsterCoreTarget = -1;
+        if (dropsCore && totalToSpawn > 0)
+        {
+            monsterCoreTarget = rand.Next(0, totalToSpawn);
+        }
+        int spawnCount = 0;
         while (usedRows.Count < _subjects.Count)
         {
             int currentRow = rand.Next(_subjects.Count);
             if (!usedRows.Contains(currentRow))  //If picked row has laready been used
             {
-                _subjects[currentRow].TriggerSpawn(currentGroup[groupIndex].GetEnemyObject());
+                GameObject spawnedInstance = _subjects[currentRow].TriggerSpawn(currentGroup[groupIndex].GetEnemyObject());
+
+                // Si ce spawn doit être le porteur du MonsterCore, on remplace/ajoute le comportement
+                if (monsterCoreTarget >= 0 && spawnCount == monsterCoreTarget)
+                {
+                    if (spawnedInstance != null)
+                    {
+                        // tentative de remplacer le composant Opponent par MonsterCoreDrop
+                        var existingOpponent = spawnedInstance.GetComponent<Opponent>();
+                        if (existingOpponent != null)
+                        {
+                            // we remove the existing Opponent-derived behaviour to avoid duplicate logic
+                            Object.Destroy(existingOpponent);
+                        }
+
+                        // add MonsterCoreDrop component and configure son prefab (si disponible dans la Database)
+                        MonsterCoreDrop mc = spawnedInstance.AddComponent<MonsterCoreDrop>();
+                        mc.Init();
+
+                        // essaye de récupérer le prefab "MonsterCore" dans la database (adapter le nom si nécessaire)
+                        //GameObject corePrefab = null;
+                        //try
+                        //{
+                        //    corePrefab = Database.Instance.Prefabs["MonsterCore"];
+                        //}
+                        //catch { corePrefab = null; }
+
+                        //if (corePrefab != null)
+                        //{
+                        //    mc.SetCorePrefab(corePrefab);
+                        //}
+                    }
+                }
+
                 _copyGroupSpawn[_currentGroupIndex][groupIndex]--;
                 usedRows.Add(currentRow);
+                spawnCount++;
             }
+
+
             if (_copyGroupSpawn[_currentGroupIndex][groupIndex] == 0)  //If current ennemy has reached count of 0
             {
                 break;
diff --git a/Assets/Scripts/Opponent/MonsterCoreDrop.cs b/Assets/Scripts/Opponent/MonsterCoreDrop.cs
index c0409ab..c622d07 100644
--- a/Assets/Scripts/Opponent/MonsterCoreDrop.cs
+++ b/Assets/Scripts/Opponent/MonsterCoreDrop.cs
@@ -4,10 +4,34 @@ using UnityEngine;
 
 public class MonsterCoreDrop : Opponent
 {
-    private GameObject mosnterCorePrefab;
+    private GameObject _monsterCorePrefab;
+
+    public void Init()
+    {
+        base.Start();
+
+        // Si le prefab n'est pas fixé via l'inspector, tenter de le charger depuis Resources/"Food"
+        if (_monsterCorePrefab == null)
+        {
+            _monsterCorePrefab = Resources.Load<GameObject>("yieldFood");
+            if (_monsterCorePrefab == null)
+            {
+                Debug.LogWarning("MonsterCoreDrop: prefab 'yieldFood' introuvable dans le dossier Resources. Assignez-le dans l'inspector ou placez-le dans Resources/yieldFood.");
+            }
+        }
+    }
+
+    public void SetCorePrefab(GameObject prefab)
+    {
+        _monsterCorePrefab = prefab;
+    }
+
     public override void Death()
     {
-        Instantiate(mosnterCorePrefab, transform.position, Quaternion.identity);
+        if (_monsterCorePrefab != null)
+        {
+            Instantiate(_monsterCorePrefab, transform.position, Quaternion.identity);
+        }
         base.Death();
     }
 }
diff --git a/Assets/Scripts/Tiles/SpawnerTile.cs b/Assets/Scripts/Tiles/SpawnerTile.cs
index e668a4b..20affb4 100644
--- a/Assets/Scripts/Tiles/SpawnerTile.cs
+++ b/Assets/Scripts/Tiles/SpawnerTile.cs
@@ -138,9 +138,9 @@ public class SpawnerTile : LevelTile
      * Instantly spawns an enemy.
      * Used for GroupSpawn
      */
-    public void TriggerSpawn(GameObject enemy)
+    public GameObject TriggerSpawn(GameObject enemy)
     {
-        enemy.Create(Position, parent: LevelManager.Instance.LevelTransform);
+        return enemy.Create(Position, parent: LevelManager.Instance.LevelTransform);
     }
 
 #if UNITY_EDITOR