Thunder Ball

A ball of wind shots out at the target area and creates a shockwave of wind and thunder. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d6 fire damage on a failed save, or half as much damage on a successful one. 

In addition, unsecured objects that are completely within the area of effect are automatically pushed 10 feet away from you by the spell's effect, and the spell emits a thunderous boom audible out to 300 feet. 

At higher levels you add 1 d6 per spell level and the push back increases 5 feet.