Vampiric Smite

The next time you hit a creature with a weapon attack before this spell ends, you siphon away some of the target's life force. The attack deals an extra 3d6 necrotic damage to the target, 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 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.