Vampiric Smite

The next time you hit a creature with a melee weapon attack during the spell's duration, your weapon drains their life force and transfers it to you, and the attack deals an extra 1d10 necrotic damage to the target and heals you for the same amount.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage of the spell increases by 1d10 for each slot level above 1st.