Wizard Attack 7Concussive Echo
A focused blast of thunder slams into your foe, and the energy of the blast is stored in your enemy’s body. When it next attacks, that energy is released in a concussive burst.
Encounter Arcane, Charm, Evocation, Implement, Thunder
Standard Action Ranged 10
Target: One creature
Attack: Intelligence vs. Will
Hit: 2d6 + Intelligence modifier thunder damage. The first time the target makes an attack roll before the end of your next turn, it deals 5 thunder damage to itself and to each enemy within 3 squares of it.
Updated in Wizard Schools article.
Published in Arcane Power, page(s) 106.