Shaman Attack 1Defending Strike

Your spirit companion strikes a foe, drawing energy from the enemy and turning that energy into a protective shield.

At-Will        Implement, Primal, Spirit
Standard Action      Melee spirit 1

Target: One creature

Attack: Wisdom vs. Reflex

Hit: 1d8 + Wisdom modifier damage. Until the end of your next turn, you and your allies gain a +1 power bonus to AC while adjacent to your spirit companion.
Level 21: 2d8 + Wisdom modifier damage.

Published in Player's Handbook 2, page(s) 121.