Suffering a foe's lucky attack, you call on your god to visit your pain upon the one you have sworn to kill.

Daily   ✦     Divine, Radiant
Immediate Reaction      Close burst 10

Trigger: An enemy scores a critical hit against you

Target: Your oath of enmity target in the burst

Effect: The target takes radiant damage equal to the critical hit's damage.

Published in Player's Handbook 2, page(s) 38.