Twilight Beacon

You summon a beacon of twilight energy that appears as a glowing pillar of radiant light entwined with dark tendrils of shadow. The sphere affects all creatures of your choice within the radius in the following ways: Allies gain 20 temporary hit points at the start of their turn, resistance to all damage types, and immunity to necrotic damage. They can also add your Charisma modifier (minimum 1) to their attack rolls. Undead and fiends take 6d10 radiant and 6d10 necrotic damage at the start of their turn. Other enemies take half damage and must succeed on a Wisdom saving throw or become frightened for the duration.