Draining Smite

Your weapon swirls with shadows that drain the life of your foe. The target hit by the strike takes an extra 2d6 necrotic damage. Additionally, if the target is a creature, it must make a Constitution saving throw or you regain a number of hit points equal to the necrotic damage dealt. Then the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d6 for each slot level above 2nd.