Combustible Mark

Mark one creature, object, or 5-ft. square within range as volatile. The first time before the duration ends that the target takes fire, acid, lightning, thunder, or force damage, it takes extra damage equal to your CHA modifier and sheds sparks, fumes, or shrapnel.

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