Mordenkainen's Lost Notebook

Azure Flame

5-level Evocation

Choose a point you can see within range. Every creature or object in a 20-foot radius sphere centered on the point you selected bursts into azure colored flames. Creatures caught in the sphere’s area must make a Dexterity saving throw or take 3d8 fire damage and catch on fire. A successful save halves the damage and avoids catching on fire. Unattended objects take the full damage and catch on fire.   A creature or object that starts its turn on fire takes 1d8 fire damage. The flames can be snuffed out with an action, ending the spell for the affected creature. However, if an affected creature is a fiend, only a dispel magic, remove curse, or greater restoration will end the flames, which burn for the spell’s full duration and deal radiant instead of fire damage.
At higher levels: When you cast this spell using a spell slot of 6th level or higher, the initial fire damage increases by 1d8 for each slot level above 5th. If you cast this spell using a spell slot of 7th level or higher, the ongoing damage increases by 1d8 for every two slot levels above 5th