Frostbitten Touch

Your frigid touch destroys living tissue.

Prerequisite(s): ability to cast 5th-level arcane spells.

Benefit(s): When you hit a target with a melee touch attack dealing cold damage, the target must succeed at a Fortitude save (DC 10 + 1/2 your caster level + your Intelligence or Charisma modifier [your choice]) or become fatigued for 1 round. This cannot cause the target to become exhausted, even if the target is already fatigued. However, if you confirm a critical hit with the melee touch attack, the target instead becomes exhausted for 1 round. Undead, constructs, and creatures immune to cold damage are also immune to this effect.