Umbra Bolt

You hurl a bolt of shadow at a creature or object within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 necrotic damage and 1d6 cold damage. 

This spell's damage increases by 1d10 and 1d6 when you reach 5th level (2d10-2d6), 11th level (3d10-3d6), and 17th level (4d10-4d6).