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How to use the Level Protection Crystal (an item that prevents downgrading during upgrades from +7 to +9)

1. When upgrading an item, tap on the Level Protection Crystal to activate it before pressing the Enhance button to upgrade. (Make sure the item icon displays a check mark ✓.)

2. If the upgrade attempt fails, the Level Protection Crystal will disappear according to the number of uses, but the upgrade level of the item will not decrease.

 Upgrading an item from +7 to +8 requires 19 Level Protection Crystals.
 Upgrading an item from +8 to +9 requires 25 Level Protection Crystals.

 Upgrading an item from +9 to +10 requires 30 Level Protection Crystals.

3. However, if the upgrade is successful, the Level Protection Crystal will not be used.

4. How to use the Destruction Protection Crystal (to prevent items from being lost/broken when upgrade fails from +10 and above):

 - While performing item upgrades, tap on the Destruction Protection Crystal to activate it.
 - After that, press the Enhance button to proceed with the upgrade.
 (Make sure the item icon displays a check mark ✓ if you intend to use it.)

 -When upgrading an item, tap on the Destruction Protection Crystal to activate it before pressing the Enhance button to upgrade.
(Make sure the item icon displays a check mark ✓.)

5. If the upgrade attempt fails, the Destruction Protection Crystal will be consumed d on the number of uses, but the upgraded item will remain intact (not broken or lost).

Upgrading an item from +10 to +11 requires 1 Destruction Protection Crystal.
Upgrading an item from +11 to +12 requires 1 Destruction Protection Crystal.
Upgrading an item from +12 to +13 requires 3 Destruction Protection Crystals.
Upgrading an item from +13 to +14 requires 5 Destruction Protection Crystals.
Upgrading an item from +14 to +15 requires 7 Destruction Protection Crystals.

6. However, if the upgrade is successful, the Destruction Protection Crystal will not be used.