Awakened Inferno

Flaming spheres start spinning around you faster and faster, creating flames and new spheres that will crash into each other creating new flames and even more fire spheres through violent explosions. This chain reaction with generate a little star with you at its center which covers an area of 300 ft. in diameter. It ignites flammable objects in the area that aren't being worn or carried. All other creatures in 150 ft. from you must make a Dexterity saving throw. A creature takes 8d6 fire damage on a failed save, or half as much damage on a successful one. When another creature enters the affected area for the first time on a turn or starts its turn there, the creature must succeed on a Dexterity saving throw. A creature takes 8d6 fire damage on a failed save, or half as much damage on a successful one. While maintaining concentration on this spell, you can't use your movement action except by first making a DC 15 Dexterity saving throw, on a failed save you take 8d6 fire damage. When the spell ends because your concentration is broken all the fire and the flames collapse on you dealing you 16d6 fire damage.