How to Build a Dungeon: Book of the Demon King #4

Plot

Lord of his dungeon, king of his country, and master of an insatiable harem, Aur still isn’t satisfied–his road is the path of world conquest. But the world isn’t just going to roll over and let him do as he pleases. The most dangerous king around, the Hero King Wolf, prepares an army to bring an end to Aur’s ambitions–and reclaim his daughter from the dungeon! The secrets of Aur’s past are revealed as an invincible hero approaches…!