Blight Bolt

You summon the darkness within and target a creature within range. Drawing upon the essence of undeath, you hurl a mote of darkness at your target. Make a ranged spell attack against the target. On a hit, the target takes 1d10 necrotic damage. You gain temporary hit points equal to half the damage dealt.

This spell's damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).