Drain Life-Force

Your hand is covered in a black substance that shines in sunlight.You make a melee spell attack against a creature within your reach. On a hit, the target takes 1d12 necrotic damage, and you regain hit points equal to the amount of necrotic damage dealt. The damage is dealt to the maximum hitpoints until the creatures takes a rest. Until the spell ends, you can make the attack again on each of your turns as an action. If you miss any of the attacks the spell ends and you take 1d10 necrotic damage

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d12 for each slot level above 2nd to a maximum 5d12 damage