Vampiric Smite

The next time you hit a creature with a weapon attack before this spell ends, the weapon Is consumed by necrotic flames as you strike. The attack deals an extra 1d8 necrotic damage to the target and changes all damage from this attack to necrotic and you regain hit points equal to half the amount of necrotic damage dealt.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d8 for every two slot levels above 2nd.