Artax's Twin Tornados

A fire and an ice tornado form on a point within range you can see and start circling the area in a 5ft radius, 20ft high cylinder. Each creature in the cylinder must make a dexterity saving throw. A creature takes 2d12 fire damage, 2d12 cold damage and 1d10 bludgeoning damage on a failed save, or half as much damage on a successful one. If the creature fails its saving throw and the area it occupies is equal to or smaller than the radius, it is knocked prone.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the bludgeoning damage increases by 1d10, the radius increases by 5ft, and the height increases by 20ft for each slot level above 3rd. At 8th level the spell requires concentration, up to 30 seconds, at 9th level up to 1 minute.