A storm of void bolts rains down in a 20-foot-radius, 30-foot-high cylinder centered on a point within range.
Each creature in the cylinder must make a Dexterity saving throw.
A creature takes 4d6 lightning + 4d6 cold damage on a failed save, their movement speed is lowered by 5ft, and flying creatures lose their ability to fly. This lasts until the target finishes a long rest.
If a creature is concentrating in the spell’s area, the creature must make a successful Constitution saving throw against your spell save DC or lose concentration.
On each of your turns until the spell ends, you can use your action to call down void bolts in this way again, targeting the same point.