A warhammer with liquefying powers.
Forged from the stuff of legends by a great Sacre-Sorcerer. Grants the wielder a variety of different powers throughout the day and night.
Believable magic, like ordinary physicis, operates according to some invariable laws that always result in some kind of cost or "bounce back". The grater the magic, the more it should cost the character physically, emotionally, and spiritually.