Arrow Storm

When you cast this spell, arrows come down from the sky, in a 20-foot-radius, 40-foot-high cylinder. Each creature in the cylinder must make a Dexterity saving throw, or take 4d6 piercing damage on a failed save, or half as much damage on a successful one. Creatures who fail the save, also have they're movement speed cut halved until the end of your next turn

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the piercing damage increases by 1d6 for each slot level above 3rd.