Babylon's Star Fire

A bright streak blasts from the ground beneath you into a sudden explosion of flame which surrounds you, without harming you. Each creature within a 30-foot-radius sphere of you 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.

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 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.