Devouring Slash

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target must succeed on a Constitution saving throw vs your spell save DC or take 2d8 Necrotic damage. You also gain temporary hit points equal to half the damage dealt by this spells effect, until the hit points are depleted or a short or long rest is completed. Once you have gained temporary hit points from this spell you may only cast it again once you have completed a short or long rest.

This spell’s damage increases when you reach certain levels. At 5th level, the Spell deals an extra 1d8 necrotic damage to the target on a failed save. The damage rolls increase by another 1d8 at 11th level (4d8) and 17th level (5d8).