Erupting flames

You target an active, large or smaller (use creature size as an example), fire which causes it to sputter violently, as if an invisible wind is stoking the flames, before erupting into a violent flame. Each creature in a 20-foot-radius sphere centered on that targeted flame must make a Dexterity saving throw. A target takes 8d6 fire damage on a failed save, or half as much damage on a successful one. If you target a creature that is actively burning, they make the save with disadvantage and the flames are extinguished, if said burning creature dies from this spell then they turn into ash.

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.