You breathe out a cloud of acidic black flies that streak across the battlefield, swarming your foe and attempting to enter its body.

Encounter   ✦     Acid, Arcane, Implement
Standard Action      Ranged 10

Target: One creature

Attack: Constitution vs. Fortitude

Hit: 2d6 + Constitution modifier acid damage, and the target grants combat advantage until the end of your next turn.

Infernal Pact or Vestige Pact: On a miss, the target grants combat advantage to you until the end of your next turn.

Published in Arcane Power, page(s) 75.