Board Thread:New on StevenUniverse Wiki/@comment-26208943-20150115060638/@comment-3965346-20150125173825

LikeBrony wrote: Twilightsparkle7625 wrote: Grabbergirl wrote: I think it's a gun! I can totally see her handling a gun. I believe her arm is weapon (she can probably make it a cannon), her fingers are a weapon (she can probably shot them off, like missles), and she can summon a gun from her gem. i don't think they would put a gun in a childrens show maybe it could just be a cannon an LASER gun, I think laser guns are very inocent to childrens.

That sounds more like it, also since peridots are water absorbant maybe she uses absorbed water for some her attacks (like a water jet)