Dungeon Conqueror

After being saved from his own execution by a deal-making daemon, Keaton's tasked with killing a dungeon lord. A straightforward task for a former assassin, but the moment Keaton's dagger plunges into the dungeon core crystal, he becomes the newest lord of The Labyrinth. What starts as a maze of useless caverns quickly turns into something respectable as Keaton uses his powers to craft defenses and facilities. But to truly grow his dungeon, he needs minions. And to control those minions, he needs lieutenants: Beautiful, monstrous women with strength and powers beyond his understanding.

Keaton and his monster girls have defeated their first rival dungeon lord, but there are many more out there. One in particular seems eager to get his hands on Cassia, and when he demands the lieutenant under penalty of invasion, Keaton must think fast. The quest to undermine that greater evil leads Keaton to ally himself with an alluring succubus who feeds on the sexual energy of wayward mages. Bonding with her may damage his relationship with Adriana and Cassia, but if they're going to stop Cassia's former master, they'll need all the help they can get.