Move Creation Workshop

[Amaterasu]

Black Heart - (300, Ranged Proficiency, Physical Strength Proficiency.) 

Black Heart is a Key-Blade born from Darkness itself, though it still possesses many of the abilities of a Traditional Key-Blade. For example, the key-blade can unlock any lock, magical or mundane. The Key-Blade can also be used as a sword, or as a ranged weapon. This blade has a length of about 22 inches long, and a width of about 10 inches. The blade can be summoned in a flash of darkness by Repliku. 

I recommend a thorough review of this one... you're missing too much essential information on the weapon, like how tiring it is to use, how fast it is to swing, and how it can be used as a ranged weapon.

Also, the "Can unlock any lock" is no bueno. It would allow you to pull things like opening other people's sealed Vaults, bypass security locks all over the Omniverse (Palpatine's tower comes to mind) and with some creativity unlock encrypted files/password-restricted access to Dataverse content. If you want to retain the "Can unlock stuff" ability, maybe have the Black Heart be a sort of handy swiss army key that can unlock any door that you would realistically have the key to in the first place (like to your own base, to vaults that you have access to etc.).