Cue

A big black ball shoots from your hand to a point you choose within range and then blossoms with a low roar into an explosion of flame. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 5d10 fire damage on a failed save, or half as much damage on a successful one.

The fire instantly spreads 20 feet in each direction. It ignites flammable objects in the area that are and aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d10 for each slot level above 3rd.