Death Coil

You hurl a mote of death at a creature or object within range. On a hit, the target takes 1d10 necrotic damage. If you target an undead creature, it gains 1d6 temporary hit points instead.

This spells damage increases by 1d10 upon reaching 5th level (2d10), 11th level (3d10), and 17th level (4d10). The amount of temporary hit points gained increases by 1d6 upon reaching 5th level (2d6), 11th level (3d6), and 17th level (4d6).