Adela's Skyfire

A swirling mass of ruddy clouds appears in the sky 100-feet above an area within 120 feet. The cloud unleashes a tide of flaming rain upon a 20-foot-diameter, 100-foot-high cylinder. Creatures within the radius must make a Dexterity saving throw when this spell is cast, and each time they end their turn within the area, taking 8d6 fire damage on a failed save, or half as much damage on a success.

This spell fails if there's no room to conjure the cloud.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 for each slot level above 5th.