Maestro's Keyกุญแจมาเอสโทร

Has a 100% chance of opening treasure chests between levels 21-85. When a character level 77 or below uses it on a treasure chest that is 6 levels higher or more, or when a character level 78 or above uses it on a treasure chest that is 5 levels higher or more, the key disappears but the reward cannot be obtained.