Chromatic Nova

Release a pulse of energy into the ground beneath your feet, composed of acid, cold, fire, lightning, poison, or thunder. All creatures within 10ft of you must make a dexterity saving throw, taking 4d8 of the damage type chosen on a failed save, or half as much on a successful one. 

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 3rd.