Tornado

You manipulate the winds into a dangerous, swirling vortex. Until the spell ends, a 100ft high cylinder of air with a radius of 20ft becomes a destructive tornado. At the start of the initiative order the tornado moves 20ft in a random direction. Any creature that enters the cylinder or begins its turn there takes 12d6 bludgeoning damage. A creature that takes damage from the tornado must also pass a Strength saving throw or be caught in its grip. While caught by the tornado a creature moves with it and is considered stunned and knocked prone. Mundane projectiles that pass into the cylinder are blown harmlessly upward.