Tempest Burst

You whip up a torrent of violent wind swirling around you. Each creature in a 15-foot cube centered on you from you must make a Strength saving throw. On a failed save, a creature takes 3d8 bludgeoning damage and is flung up to 20 feet away from you in a random direction and knocked prone. If a thrown target strikes an object, such as a wall or floor, the target takes an addition 1d6 bludgeoning damage for every 10 feet it was thrown. If the target is thrown at another creature, that creature must make a Dexterity saving throw or take the same damage and be knocked prone. On a successful save, the creature takes half as much damage and isn't flung away or knocked prone.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 4th.