Death's Call is a 17th level cleric Encounter power that was introduced in Heroes of Shadow for the Death Domain of the Warpriest.
Death's Call
Cleric Attack 17
You summon up a burst of divine power, granting resilience to your allies as you drive your foes closer to their doom.
Close burst 5
Trigger: A creature within 5 squares of you drops to 0 hit points.
Target: Each enemy in the burst
Attack: Wisdom vs. Fortitude
Hit: 2d8 + Wisdom modifier psychic damage.
Effect: You and each ally in the burst gain a +2 power bonus to attack rolls until the end of your next turn, and gain 10 temporary hit points.