Is there not a topic in this forum people won't go troll? No? Fine. Anyway, naturally the person would have a MAJOR drawback. Also, I gave up the idea of magic, I decided to go with cryokinesis. It would manifest in the person having cold blood, almost like a lizard, except it wouldn't affect them much.
Sucks to be a weight on the wrong side of the brilliance-insanity scale.