Arkdos' Devilish Flame

A wave of firey force sweeps out from you. Each creature in a 10-foot radius originating from you must make a Dexterity saving throw. On a failed save, a creature takes 4d6 fire damage and, at the end of its turn,takes 2d6 fire damage. On a successful save, the creature takes half as much damage and doesn't have a lingering effect. They must use an action to put themselves out.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for the initial damage for each slot level above 3rd.

(Screencap in Details originally from Aang V Ozai "Avatar :The Last Airbender")