Acid hands

The caster holds their hand outstreatched towards another creature nearby, causing the users hand to transform, from fingers to wrist, into the same amount of acid as the hands mass. the left over stump is not bleeding but is quite painfull. after this has happened, roll a dexterety check, if it is over 18, the hand gracefully reforms and reattaches itself. if this is failed, however, the acid stays as acid forever.