You exhale a blast of acid, drawing on the power of the fearsome black dragon to sear your enemy and limit its vision.

Encounter   ✦     Acid, Arcane, Implement
Standard Action      Close blast 3

Target: Each creature in the blast

Attack: Charisma vs. Reflex

Hit: 5d6 + Charisma modifier acid damage.

  Dragon Magic: Until the end of your next turn, the target doesn't have line of sight to any creature more than 3 squares away from it.

Published in Player's Handbook 2, page(s) 146.