Elemental Wave

You strike the ground, creating a burst of primal energy that ripples outward from you. Each creature you choose within 30 feet of you must succeed on a Dexterity saving throw or take 2d6 fire damage, as well as 2d6 cold damage, 2d6 lightning damage, 2d6 acid damage, and 2d6 thunder damage and is knocked prone. A creature that succeeds on its saving throw takes half as much damage and isn’t knocked prone.