Aura of Death

Dark, necrotic energy radiates from you in an aura with a 30-foot radius. Until the spell ends, the aura moves with you, centered on you. Each hostile creature in the aura has vulnerability to necrotic damage (unless it has immunity in which case it is reduced to resistance, or resistance in which case it becomes neutral). In addition, a hostile creature loses 1 hit point whenever it starts its turn in the aura.

At Higher Levels. When this spell is cast at fifth level or higher, every hostile creature in the aura loses [level cast at minus 3] HP.