Conflagration

You target a burning object or creature you can see within range, channeling energy to fan the flames to outrageous levels. The creature takes 2d8 fire damage plus the potential burning damage they would take (for example, a creature burning for 3d6 damage per turn would take 2d8 + 3d6 fire damage) and ceases burning. The flames then explode outwards in a 20 ft. sphere, forcing any other creatures within range to make a Dexterity saving throw. On failure, those creatures take the same damage (half on a successful save).