Move Creation Workshop

[Amaterasu]

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

 

A key blade that was created out of the Darkness from within Repliku's Heart. 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. This key blade can be swung incredibly fast by Repliku and is usually meant to be wielded one-handed, leaving his hand free for another weapon, or move. This is moderately tiring for Repliku to use and takes him 20 seconds to summon. With RPer consent, this can be used to "lock" their heart, and prevent the formation of a Heartless or Nobody if any of the Heartless attempts to consume them. Furthermore, this also doubles as a swiss army key for Repliku. Should he ever have a place to call home, the Black Heart could act as a multi-purpose key for him. It can be used as a Ranged Weapon by either channeling spells through it to do an extra damage level, or by throwing it at an enemy. 

:frog: Is it summoned in a flash of darkness (which sounds like it's just about instantaneous) or in 20 seconds?

Throwing the key would bump the cost up to 600, I forgot to say that earlier. And is it just that - thrown and then it falls to the ground and must be recovered or resummoned, or does it does it boomerang back or reappear in Repliku's hand?

Using the key as a "wand" is possible, but unless you add a special mention to the moves that you will channel through the key and add an appropriate downside you won't be allowed to make the moves stronger simply because it's channeled.
You can also put the channeling thing out as fodder: "Repliku can also channel his spells through Black Heart if he so desires, though this does not change their properties."

Lastly I would recommend separating the fluff (the "lock" - this sounds pretty cool btw! - and the multi-purpose key) to the bottom of the move so as to make it clear what's what.