Abyssal Shard

You conjure strands of energy from the Outer Planes and launch it at an enemy. Make a ranged spell attack against the target. On a hit, it takes 2d4 necrotic damage, and subtracts a 1 from its next attack roll, ability check, or saving throw.

The spell’s damage and penalty increases by 2d4 and 1, respectively,  when you reach 5th level (4d4, -2), 11th level (6d4, -3), and 17th level (8d4, -4).