Cain

(im sorry for the long intro just wanted a juicy plot. feel free to not abide to it.)your a child forced to become a black mage by your noble family. You try to run away and for punishment got put into a unkown room. the room holds a pitch black demon wolf. it tells you it can help you in exchange for your help finding a new body. you accept and are giving mighty powers at the cost of a promise to fulfill.