diff --git a/lib/src/core/engine/progress_service.dart b/lib/src/core/engine/progress_service.dart
index 4832f2c..f91a157 100644
--- a/lib/src/core/engine/progress_service.dart
+++ b/lib/src/core/engine/progress_service.dart
@@ -974,40 +974,50 @@ class ProgressService {
     ItemRarity? lostItemRarity;
 
     if (!isBossDeath) {
-      // 무기(슬롯 0)를 제외한 장착된 장비 중 1개를 제물로 삭제
-      final equippedNonWeaponSlots = <int>[];
-      for (var i = 1; i < Equipment.slotCount; i++) {
-        final item = state.equipment.getItemByIndex(i);
-        // 디버그: 장비 슬롯 상태 확인
-        // ignore: avoid_print
-        print('[Death] Slot $i: "${item.name}" isEmpty=${item.isEmpty}');
-        if (item.isNotEmpty) {
-          equippedNonWeaponSlots.add(i);
-        }
-      }
-      // 디버그: 장착된 슬롯 목록
+      // 레벨 기반 장비 손실 확률 계산
+      // Lv 1~5: 0%, Lv 6: 10%, Lv 10: 50%, Lv 15+: 100%
+      final level = state.traits.level;
+      final lossChancePercent = ((level - 5) * 10).clamp(0, 100);
+      final roll = state.rng.nextInt(100); // 0~99
+      final shouldLoseEquipment = roll < lossChancePercent;
+
       // ignore: avoid_print
-      print('[Death] equippedNonWeaponSlots: $equippedNonWeaponSlots');
+      print('[Death] Lv$level lossChance=$lossChancePercent% roll=$roll '
+          'shouldLose=$shouldLoseEquipment');
 
-      if (equippedNonWeaponSlots.isNotEmpty) {
-        lostCount = 1;
-        // 랜덤하게 1개 슬롯 선택
-        final sacrificeIndex =
-            equippedNonWeaponSlots[state.rng.nextInt(
-              equippedNonWeaponSlots.length,
-            )];
+      if (shouldLoseEquipment) {
+        // 무기(슬롯 0)를 제외한 장착된 장비 중 1개를 제물로 삭제
+        final equippedNonWeaponSlots = <int>[];
+        for (var i = 1; i < Equipment.slotCount; i++) {
+          final item = state.equipment.getItemByIndex(i);
+          if (item.isNotEmpty) {
+            equippedNonWeaponSlots.add(i);
+          }
+        }
 
-        // 제물로 바칠 아이템 정보 저장
-        final lostItem = state.equipment.getItemByIndex(sacrificeIndex);
-        lostItemName = lostItem.name;
-        lostItemSlot = EquipmentSlot.values[sacrificeIndex];
-        lostItemRarity = lostItem.rarity;
+        if (equippedNonWeaponSlots.isNotEmpty) {
+          lostCount = 1;
+          // 랜덤하게 1개 슬롯 선택
+          final sacrificeIndex =
+              equippedNonWeaponSlots[state.rng.nextInt(
+                equippedNonWeaponSlots.length,
+              )];
 
-        // 해당 슬롯을 빈 장비로 교체
-        newEquipment = newEquipment.setItemByIndex(
-          sacrificeIndex,
-          EquipmentItem.empty(lostItemSlot),
-        );
+          // 제물로 바칠 아이템 정보 저장
+          final lostItem = state.equipment.getItemByIndex(sacrificeIndex);
+          lostItemName = lostItem.name;
+          lostItemSlot = EquipmentSlot.values[sacrificeIndex];
+          lostItemRarity = lostItem.rarity;
+
+          // 해당 슬롯을 빈 장비로 교체
+          newEquipment = newEquipment.setItemByIndex(
+            sacrificeIndex,
+            EquipmentItem.empty(lostItemSlot),
+          );
+
+          // ignore: avoid_print
+          print('[Death] Lost item: $lostItemName (slot: $lostItemSlot)');
+        }
       }
     }