Thunderous Bellow

You shout a thunderous phrase that bursts outward from your location. Each creature in a 20ft cone must make a Constitution save, taking 4d8 thunder damage and is pushed 15ft away on a failure, or half as much on a success.

At Higher Levels. When you cast this spell using a slot of 4th or higher, the damage increases by 1d8 for each slot above 3rd.