(Credit to the creator's of steven universe )
Info: (If you watched steven universe its pretty self-explanatory)
Basically you have a gem of your choosing shape,color or size. This gem is located mostly on your forhead or belly button but can be anywhere, You can summon any type of weapon and anything of any shape but not animals or anything alive. You can choose any color you want to use for the weapons.
Drawbacks: Your limbs get hurt the longer you use the quirk.