Crushing Despair is a 9th level cleric Daily power that was introduced in Heroes of Shadow.
Crushing Despair
Cleric Attack 9
Your weapon attack leaves a foes so terrified that your presence threatens to destroy it.
Melee weapon
Target: One creature
Attack: Wisdom vs. AC
Hit: 2[W] + Wisdom modifier psychic damage.
Miss: Half damage.
Effect: At the end of each of the target's turns, it takes 5 psychic damage for each of your allies adjacent to it. This effect ends when the target ends its turn with none of your allies adjacent to it.