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|Character UnlockObtaining this weapon unlocks a character.
Drawing additional copies beyond the first will instead earn a Gold Moon.
|4★||Complete Wulf and Renie Lvl 45 Fate Episode "It's a Small World"|
|A giant key that can open any lock with ease. You won't even need a keychain—a single one of these will get you into anywhere you please.|
|Uninvited Guest||Massive Dark damage to a foe.
Gain and .
|Oblivion's Might||Big boost to dark allies' ATK|
|120||Unlocks at level 120:||Unlocks at level 120:|
|Visitor in the Night||When main weapon (MC only): Boost to ATK based on how few foes remain.|
- Master Key resembles a firefighter's axe, due to its distinguishable axe head color and pick-shaped pointed poll.
- Its description refers to the main use of a firefighter's axe, which is breaking down doors and windows.