Yearning Blade

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 suffers the weapon attack’s normal effects, and the target must make a constitution saving throw. On a failed save, it takes 1d8 necrotic damage, and you regain hit points equal to half the amount of necrotic damage dealt. On a successful save, the target takes 1d8 necrotic damage.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).