Metal Curse (Su)
Source: Advanced Class Guide, p. 45
The shaman causes a creature within 30 feet to become slightly magnetic until the end of the shaman’s next turn. Whenever the creature is attacked with a melee or ranged weapon constructed primarily of metal, it takes a –2 penalty to AC. At 8th and 16th levels, the penalty increases by –2 and the duration increases by 1 round. Once affected, the creature cannot be the target of this hex again for 24 hours.