Your shield becomes your staunchest ally.

Encounter   ✦     Martial, Weapon
Standard Action      Melee weapon

Requirement: You must be using a shield.

Target: One creature

Attack: Strength vs. AC

Hit: 4[W] + Strength modifier damage, and you take only half damage from the target's attacks until the end of your next turn.

Effect: You gain a +2 power bonus to AC until the end of your next turn.

Published in Player's Handbook, page(s) 86, Class Compendium.