A bolt of black vitriol splashes over your foe, leaving it vulnerable to further acid attacks and to your magic of death and decay.

Encounter   ✦     Acid, Arcane, Implement
Standard Action      Ranged 10

Target: One creature

Attack: Charisma vs. Fortitude

Hit: 2d8 + Charisma modifier acid damage. Until the end of your next turn, the target gains vulnerable 10 acid and vulnerable 10 necrotic.

  Dark Pact: The target loses any resistance to acid or resistance to necrotic until the end of your next turn.

Published in Arcane Power, page(s) 82.