Chromafire

A beam of chromatic light flashes from your pointing finger, then condenses to linger at a chosen point within range as the bead blossoms with a low roar into an explosion of flame that spreads around corners. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A creature takes fire damage equal to the total accumulated damage on a failed save, or half as much damage on a successful one.

The spell's base damage is 15d6.

The fire damages objects in the area and ignites flammable objects that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the base damage increases by 1d6 for each slot level above 7th.