Draining Wound

You pierce the target with a necrotic thorn which flares up and absorbs all future blight you inflict. Make a melee spell attack dealing 1d6 necrotic damage. If you hit the creature for the duration of the spell any necrotic damage you deal to the target, including the amount you dealt with this spell, you regain half as many hit points to your current hit points

At higher Levels. When this spell is cast at 3rd Level or higher the damage dealt by the spell increases by 1d6 for every level above 2nd (to a maximum of 5d6)