You loose a shot as you inveigh against your foe, confounding its defenses so that an ally's strike is sure to score a deadly wound.

Encounter   ✦     Arcane, Thunder, Weapon
Standard Action      Ranged weapon

Target: One creature

Attack: Charisma vs. AC

Hit: 3[W] + Charisma modifier thunder damage. The next attack roll made against the target before the end of your next turn targets all of its defenses. For each defense the attack hits beyond the first, the attack deals 1d10 extra damage.

Published in Arcane Power, page(s) 15.