Radiant Beams is a 16th level cleric Utility prayer that was introduced in Divine Power.
Radiant Beams
Cleric Utility 16
A halo of brilliance springs from your brow, defending your comrades from the foulness of the undead.
Close burst 5
Target: You and each ally in burst
Effect: Until the end of your next turn, each target gains resist 20 necrotic and deals 1 radiant damage to any enemy that attacks him or her.
Sustain minor: The effect persists.