Avenging Smite

The next time you hit a creature with a melee weapon attack during this spell’s duration, the creature becomes marked with an avenging aura. Whenever you are hit by the marked creature while the spell is active, you may use your reaction to instantly deal 1d10 psychic damage to the creature. Once you have dealt a combined 40 damage to the creature from this spell, it ends.

Any excess damage past 40 is instead turned into temporary hit points for you.