Unkindness

You set a flock of conjured ravens on a target within range. Make a ranged spell attack against the target. On a hit, the target takes 2d4 piercing damage. On a critical hit, the target must roll a d4 and subtract the number rolled from the attack roll or saving throw it makes before the end of its turn.

This spell's damage increases by 2d4 when you reach 5th level (4d4), 11th level (6d4), and 17th level (8d4).