Chromatic Wave

As you hold your hands with thumbs touching and fingers spread, magical energy of your choice shoots forth from your outstretched fingertips. You choose acid, cold, fire, lightning, poison, or thunder, and each creature in a 15-foot cone must make a Dexterity saving throw. A creature takes 3d8 damage of the type you chose on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.