Cynder's Blazing Tower

Placing a hand upon the ground flames emerge targeting one creature you can see creating a tower of flame 15ft x 15ft centered on the target. The target creature must make a Dexterity saving throw. A target takes 15d6 fire damage on a failed save, or half as much damage on a successful one.

The fire 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 7th level or higher, the damage increases by 1d6 for each slot level above 6th.