The Red Devil's Ashes.

[Proto Man]

Red Devil's Claw - 300 OM
-Ranged Proficiency
The Claw is unique but roughly a basic looking Grapple Hook. The arms, however, are sharpened like a blade on the outside, implying it can be used in other ways that just a means of movement. The type of metal is unknown, but it is crimson in color, and carries ruins are typical for resisting flames. This does nothing for the wielder, just the grapple. The 'rope' is also strange, in the fact that it is hair. Most likely from a human or humanoid. It's true length is unknown as it has been braided in some places. But Ash has access to 15 ft, if she so chooses to use all of it.
Ash has had this weapon for a long time, and knows it inside and out, allowing her to use it while moving around and is generally using it to do so.

Modifications: Grapple Shot - 300 OM
Ash paid a blacksmith to come up with creative way to allow her to shoot The Claw, and he came up with a system similar to a crossbow. Loading the hook into the firing mechanism that is attached to her arm with a heavy duty brace, Ash can then shoot the hook in any direction she can aim it. The rope remains free of the device upon launch, if ever the target's position exceeds the hair's length, Ash will have to give chance in whatever fashion it takes.

This doesn't have to be a move. It can just be part of the above description.

Modifications: High Power - 300 OM
The Claw shoots from the device on Ash's arm with the power and speed of a harpoon gun. Able to pierce a limb of a giant, without taking her own arm off. The 'rope' is in no way attached to her arm, but the recoil of firing the hook is very real.

This doesn't have to be it's own move either, it can be part of the above description. I'd just be aware that durable primes or secondaries probably won't be grievously injured.

The detail is something wonderful that we love, but essentially, you can combine all those details into one, 600 OM move.

As for your question -- can she use the hook by itself (throw it from the rope) OR load it into the launcher and shoot it (resulting in a more potent shot at the cost of her having to take time to load it into the bracer? That could be an additional 300 OM as it provides another manner in which the hook can be used.