Wave of Force

A blast of Forceful air bursts from your hands. Each creature in a 30-foot cone must make a Strength saving throw. A creature takes 5d10 thunder damage damage on a failed save, or half as much damage on a successful one. On a failed save the creature is also knocked back 20 feet and falls prone. 

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d10 for each slot level above 5th.