Cruel Sun

You summon a ball of intense flame and heat and throw it a target. Each creature in a 30-foot-radius sphere centered on a point designated by the caster must make a Dexterity saving throw. A target takes 12d8 fire damage on a failed save, or half as much damage on a successful one.

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 6th level or higher, the damage increases by 1d8 for each slot level above 5th.