Thunderous Burst

Air balls in your hand and is unleashed a concussive torrent of pressure and a 10 foot cone. All creatures within that cone take 5d6 bludgeoning damage and must make a constitution saving throw or be knocked back 10 feet and rendered prone on a successful save or half as much damage on a fail. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the spell creates increases by 1d6 and widens by 2.5 feet