Aura of Transfusion

You create an area where your power is heightened, allowing you to transfer blood from enemies directly to an ally within this area. A mist of dark red fog flows out from you to form a 10-foot radius sphere around you. To cast this spell requires taking 1d4 damage before the effects of the spell may take place. Until the spell ends, this aura moves with you, remaining centered on you. Once activated you may immediately target an enemy creature within the aura with a ranged or melee spell attack. On a hit, the target takes 3d8 necrotic damage. As a bonus action, you may then heal an ally within the aura a number of hit points equal to the damage dealt.