Erosion Curse (Su)
Source: Advanced Class Guide, p. 44
The shaman summons the powers of nature to erode a construct or an object within 30 feet. This erosion deals 1d6 points of damage per 2 shaman levels, ignoring hardness and damage reduction. If used against a construct or an object in another creature’s possession, the construct or the creature possessing the object can attempt a Reflex saving throw to halve the damage. Once an object or a construct is damaged by this erosion, it cannot be the target of this hex again for 24 hours.