Coalescence

You concentrate the powers of life and death in a dense beam of necromancy. All allies who start their turn, or enter the beam for the first time on their turn, have 4d8+4 hit points restored. Enemies who interact with the beam in the same way receive 4d8+4 necrotic damage. The enemy must make a dexterity saving throw, on a success the damage is halved. The beam persists until the start of your next turn.