Demonic Drain

You focus on two creatures within range, and tendrils of evil energy leap out of the ground around them. Each creature must succeed on a Constitution saving throw or take 7d6 necrotic damage, and you regain hit points equal to half the damage dealt. On a successful save, the creatures take half damage and you do not regain hit points. Undead and fiends are immune to this effect.

At Higher Levels. When you cast this spell with a spell slot of 5th level or higher, the damage increases by 1d6 for each spell slot level above 4th.