Devouring Smite

The next time you hit a creature with a melee weapon attack during the spell’s duration, necrotic magic engulfs your weapon, and the attack deals an extra 2d6 necrotic damage to the target  and causes you to recover hit points equal to the damage dealt by this spell.

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