Blood Siphon

Blood-red spectral tendrils extend out 30 feet from you in all directions. When you cast this spell, choose up to six creatures within range. Each target must succeed on a Wisdom saving throw or be wracked with pain as its life force is siphoned away and channeled into you. On a failed save, a target takes 2d4 necrotic damage and you regain hit points equal to half the amount of necrotic damage dealt. Until the spell ends, you can use this effect again on each of your turns as an action.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d4 for each slot level above 3rd.