Philosopher’s Catalyst

Touch one nonmagical object or mass of material no larger than a 10-ft. cube. For the duration, you may change its substance at the start of each of your turns into another mundane substance of equal or lesser value. If used on a structure, the GM determines whether this creates collapse, breach, difficult terrain, or cover. Magic items, creatures, and attended objects are unaffected.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.