As your foe attacks your ally, you intervene to protect your friend.

At-Will   ✦     Augmentable, Psionic, Weapon
Immediate Interrupt      Melee 1

Trigger: An enemy adjacent to you targets one of your allies with a melee attack

Target: The triggering enemy

Attack: Constitution vs. AC

Hit: 1[W] + Constitution modifier damage, and the target attacks you instead of the ally.

Effect: You don't get your normal standard action on your next turn.

Augment 2

Hit: 2[W] + Constitution modifier damage, and the target takes a penalty to its attack roll equal to your Charisma modifier.

Augment 6

Hit: 3[W] + Constitution modifier damage, and you slide the target 3 squares and shift 3 squares to a square adjacent to it. The target then attacks you instead of the ally.

Effect: You get your normal standard action on your next turn.

Published in Player's Handbook 3, page(s) 54.