Remorse is a 13th level cleric Encounter prayer that was introduced in Divine Power.
Remorse
Cleric Attack 13
Your words of reproach cause your foes to hesitate as they regret their violent acts.
Area burst 1 within 5 squares
Target: Each enemy in burst
Attack: Wisdom vs. Will
Hit: Until the end of your next turn, the target gains vulnerable 10 to all damage and is dazed.
Effect: Each ally in the burst can spend a healing surge.