Demon King's Castle from Scratch

Thirty years after the dragon-slaying craze and war, as Reginald, the eldest prince of the powerful Lux Empire, was about to ascend the throne, a terrifying and painful mutation occurred in his body. The chief magician of the palace told him: This is the curse of the Dragon God; but the prophecies spread throughout the continent hinted to the world: he will cause the devil to bring about the end. For the sake of peace in his empire, Reginald decided to fight against the curse and embark on a path to fight against the gods - to build his own Demon King's City.