By whistling softly through his teet, the Bone Gnawer can summon a sudden and destructive rust onto metal in his vicinity. Spearheads crumble, swords corrode and mail falls apart at the werewolf's command. Some Gnawers use this trick to protect their kin from armed men in a humane fashion, but others prefer to inflicit little poetic justices - such as attending the latest bear-baiting and corroding the chain holding the bear in question. This Gift is taught by a Water spirit.
The player spends a point of Gnosis and rolls Wits + Crafts. Each success allows the Gnawer to corrode one ferrous metal object into fragile uselessness, although detailed works such as a chain hauberk count as two objects. The Garou need not be touching the object at the time, but he must be able to see it and be within conversational earshot.