Alexander’s Amazing Inferno

The 100 gold worth of combustibles and the dragon scale burst into a towering inferno. This inferno towers 60ft tall and 10ft in diameter any creature with in the inferno take 20d4 Fire damage and must make a dexterity saving throw, on a success they take half damage and move out of the inferno, on a fail take full damage and stay in the inferno. Creatures standing 10ft outside of the inferno take have of the damage of those on the inside of the inferno. On the casters turn they can move the inferno up to have of their movement speed.