Holy Nova

The ultimate manifestation of the Holy Light-–a wave of unbridled light that washes away both injuries and those who inflict them. All foes within 30 feet of the caster must make a Dexterity saving throw. A target takes 20d6 holy damage on a failed save and is blinded, or half as much damage on a successful one without becoming blinded. Blinded targets make a Constitution saving throw at the end of their turns. On a success, the blindness fades, but on three successive failures, the blindness becomes permanent. Demons and undead make this saving throw with disadvantage.

You and all allies within 30 feet regain hit points equal to the amount rolled on the damage dice. Constructs and undead cannot be healed by this ability.