Divine Reprisal is a 15th level cleric Daily attack that was introduced in Divine Power.
Divine Reprisal
Cleric Attack 15
You utter a prayer to heal an ally's injury and exact punishment against the attacker.
Ranged 10
Trigger: An enemy within 10 squares of you hits your ally
Target: The triggering enemy
Attack: Wisdom vs. Will
Hit: 3d8 + Wisdom modifier radiant damage.
Effect: The ally can make a saving throw and can spend a healing surge.