You create an area of necrotic energy under your control.

Healing Dampening. Any creature within the area that would regain hit points must succeed a Constitution saving throw, or regain only half the hit points they otherwise would.

Life Energy Manipulation. When you cast this spell, and again as an action on each of your turns, you can force one creature of your choice within the spell's area to make a Constitution saving throw. The target takes 4d6 necrotic damage, or half as much on a success. When you damage a creature in this way, you may select another creature in the spell's area, and cause them to regain hit points equal to the necrotic damage damage dealt. A creature that regains hit points in this way is not subjected to this spell's Healing Dampening effect.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 for each slot level above 5th.