Through the Fire and Flames

Fire energy gathers and erupts out in a 60-foot-radius sphere from a point within range. Each creature in that area must make a Dexterity saving throw. A target takes 10d8 fire damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the damage increases by 2d8 for each slot level above 7th.