Through skill and luck, you narrowly avoid an attack but leave yourself perilously exposed.

Daily   ✦     Martial
Immediate Interrupt      Personal

Trigger: You are hit by an attack.

Effect: You take no damage from the attack, but you are stunned and take a -2 penalty to all defenses until the end of your next turn.

Published in Player's Handbook, page(s) 81, Class Compendium.