Devouring Inferno

Flames explode from a creature you can see within range. It must make a dexterity saving throw. If it fails the saving throw, it takes 10d6 fire damage. On a successful saving throw it takes half as much damage. Pass or fail, it also becomes wreathed in flames that lick out and attempt to light other nearby creatures on fire. Any creatures not immune to fire or already wreathed in flames that starts or ends its turn within 5 feet of a creature wreathed in flames must also make a dexterity saving throw. If it fails the saving throw, it takes 8d8 fire damage and also become wreathed in flames. A Creature that is wreathed in flames makes a dexterity saving throw at the end of each of its turns. If it fails, it takes 5d6 fire damage. On a successful save, the creature is no longer wreathed in flames.