You speak a few words of an ancient spell, instilling your attacks with the power to bestow vulnerability on a foe.

Daily   ✦     Arcane, Stance
Minor Action      Personal

Effect: When you use this power, choose acid, cold, fire, lightning, or thunder. Until the stance ends, whenever you hit an enemy, that creature gains vulnerable 5 to the chosen damage type until the end of your next turn.

Published in Arcane Power, page(s) 64.