You rise into the air as your body radiates overwhelming holy energy. For the duration:   You gain a flying speed of 60 feet and immunity to radiant, necrotic, and psychic damage.   Allies within 60 feet regain 20 hit points at the start of their turn.   Enemy creatures in the aura take 20 holy damage at the start of their turn (no save).   Whenever an ally would drop to 0 HP, they instead drop to 1 HP and are immediately healed for 10 hit points. This can occur once per creature.   The aura sheds brilliant light and dispels magical darkness.