Vampiric Aura

You cause necromantic energy to radiate from you in a dense aura out to 30 ft. Until the spell ends, the aura moves with you, and is centered on you.

As a bonus action, you can cause one creature within the aura to make a Constitution saving throw, taking 3d6 necrotic damage on a failure, or half as much on a success. When a creature takes damage from this spell, you can choose another creature within the spell's area to regain hit points equal to the necrotic damage taken.

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