Energy Vortex

When you cast this spell, a roaring vortex of elemental energy of the type you choose (acid, cold, fire, lightning, or thunder) bursts outward from you in a 20-foot radius. Each creature in the area must make a Dexterity saving throw. On a failed save, the creature takes 6d6 of the elemental damage type you selected, and it is knocked prone. On a successful save, the creature takes half the damage and isn’t knocked prone.

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