diff --git a/Assets/Prefabs/Enemy.prefab b/Assets/Prefabs/Enemy.prefab
index 9a64ff2..9499df2 100644
--- a/Assets/Prefabs/Enemy.prefab
+++ b/Assets/Prefabs/Enemy.prefab
@@ -17,6 +17,7 @@ GameObject:
   - component: {fileID: 772289407653213039}
   - component: {fileID: 5843668731025413174}
   - component: {fileID: 7700000000000000002}
+  - component: {fileID: 3839436596391012912}
   m_Layer: 14
   m_Name: Enemy
   m_TagString: Untagged
@@ -348,3 +349,22 @@ MonoBehaviour:
   invulnerableDuration: 0.5
   resurrectInvulnerableDuration: 2
   canResurrect: 0
+--- !u!114 &3839436596391012912
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1661912868639658944}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: f74e42a58e48af646a73723847df5633, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Assembly-CSharp::Platformer.Mechanics.MonsterRandomizer
+  idleSprites:
+  - {fileID: -7548370174848201806, guid: f7b7e5d5d35e8ea4a9574fc970089486, type: 3}
+  - {fileID: 4852648563935847630, guid: f8f1bd54f70dc914f9ff6999cff72846, type: 3}
+  - {fileID: -480068022978346209, guid: 2cd59e341ddcef747b2fdeed0e184687, type: 3}
+  - {fileID: 1142325901465378314, guid: 601020362ae2a214298ee67b288426c6, type: 3}
+  - {fileID: 3001420397446177360, guid: f2ccd91debeaa624bb282fbaa4d0153b, type: 3}
+  - {fileID: 5433026174052882790, guid: 115d57f5258ccb74f86354a2cd28045d, type: 3}
diff --git a/Assets/Scripts/Mechanics/MonsterRandomizer.cs b/Assets/Scripts/Mechanics/MonsterRandomizer.cs
new file mode 100644
index 0000000..3a4ebb5
--- /dev/null
+++ b/Assets/Scripts/Mechanics/MonsterRandomizer.cs
@@ -0,0 +1,33 @@
+using UnityEngine;
+
+namespace Platformer.Mechanics
+{
+    /// <summary>
+    /// 몬스터 종류 랜덤 영역. Awake 영역 6 종 (M001~M006) 영역 영역 idle sprite 영역 random 적용.
+    /// PD 지시 (2026-05-10): "몬스터 종류 다양하게 반영".
+    /// Animator 영역 영역 — sprite 자동 영역 영역 영역 영역 — Animator 영역 영역 (death animation 영역 영역 영역 영역 후속 영역).
+    /// </summary>
+    public class MonsterRandomizer : MonoBehaviour
+    {
+        [Tooltip("M001~M006 idle sprite 영역 (Inspector 영역 영역 영역 영역·Awake 영역 1 영역 random 영역)")]
+        public Sprite[] idleSprites;
+
+        void Awake()
+        {
+            if (idleSprites == null || idleSprites.Length == 0)
+            {
+                idleSprites = Resources.LoadAll<Sprite>("Monsters");
+                if (idleSprites == null || idleSprites.Length == 0) return;
+            }
+
+            var sr = GetComponent<SpriteRenderer>();
+            if (sr == null) return;
+
+            var anim = GetComponent<Animator>();
+            if (anim != null) anim.enabled = false;  // sprite 자동 영역 영역
+
+            var pick = idleSprites[Random.Range(0, idleSprites.Length)];
+            if (pick != null) sr.sprite = pick;
+        }
+    }
+}
diff --git a/Assets/Scripts/Skills/Effectors/Projectile.cs b/Assets/Scripts/Skills/Effectors/Projectile.cs
index 92d4e2a..8df92d8 100644
--- a/Assets/Scripts/Skills/Effectors/Projectile.cs
+++ b/Assets/Scripts/Skills/Effectors/Projectile.cs
@@ -59,10 +59,9 @@ namespace EerieVillage.Skills.Effectors
             Invoke(nameof(SelfDestruct), _lifetime);
         }
 
-        // BT12-Dev 2026-05-10 (PD #2 fix) — Wall Layer Mask (Layer 0 Default·Ground + Layer 16 Foreground·발판)
-        // Tilemap = Static collider·Projectile = Trigger·둘 다 Rigidbody2D 부재 → OnTriggerEnter2D 발화 X 영역 영역.
-        // → Update 영역 Physics2D.OverlapPoint 영역 Wall Layer 영역 영역 영역 SelfDestruct (영역 영역 영역 영역).
-        protected static readonly int WallLayerMask = (1 << 0) | (1 << 16);
+        // BT12-Dev 2026-05-10 — Wall Layer Mask. Layer 0 (Default) 영역 Level Tilemap (지면 영역) + Player 영역 영역 영역 → 영역 영역 영역.
+        // Layer 16 (Foreground·발판) 영역만 Wall 영역 영역.
+        protected static readonly int WallLayerMask = (1 << 16);
 
         protected virtual void Update()
         {