Detonate

You set off a fiery explosion centered on yourself. Each creature in the area other than yourself must make a Strength saving throw. On a failed save, a creature takes 5d8 fire damage, is pushed 10 feet away from you, and is knocked prone. On a successful save, a creature takes half as much damage and isn't pushed or knocked prone.

The fire ignites flammable objects in the area that aren't being worn or carried. 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. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.