Your skin erupts in swollen, pus-filled bumps that burst open if you are struck. Any Creature that strikes you with its body or a handheld weapon deals normal Damage, but at the same time the attacker takes 1d6 points of acid Damage and must save or be sickened for 1 round. If the attack against you is a critical hit, the attacker must save or be nauseated instead of sickened. This Damage can harm a swarm.