Enervating Smite

The next time you hit a creature with a weapon attack before this spell ends, a tendril of inky darkness reaches out from you to drain life from it. The attack deals an extra 4d8 necrotic damage.

Until the spell ends, you can use your bonus action on each of your turns to automatically deal 4d8 necrotic damage to the target. The spell ends if you use your bonus action to do anything else, if you attack a different target, if the target is ever outside the spell’s range, or if the target has total cover from you.

Whenever the spell deals damage to a target, you regain hit points equal to half the amount of necrotic damage the target takes.