Cataclysm

In seconds the ground turns to magma at a point you choose within range and crumbles before a vertical beam of fire and magma spews into the air. Any creatures in a 15-foot radius, 30-foot high cylinder centered on a point within range must make a Dexterity saving throw. A target takes 15d6 fire damage on a failed save, or half as much damage on a successful one.