Another World Labyrinth, I am the Dungeon Master

(Japanese fantasy + level guardians + dungeons + faction building + building a Nazarick-like Great Tomb) Reborn into another world, Qin Mu becomes a slime. The good news is that he became the lord of an underground city; The bad news is that there are only five slimes like him in this dungeon. They must defend themselves against adventurers' attacks while also preventing invasions from other dungeons. Qin Mu felt that his life was very miserable. Every day, he could only turn the creatures that died in the dungeon into his own monsters to barely help him resist the enemy. However, as they continued to resist, the others gradually realized that this dungeon was getting stronger and stronger. As Qin Mu acquired more and more skills from the dead adventurers, the dungeon's levels also increased. Eventually, even the strongest warrior in history could only reach the 108th floor without seeing the bottom, and people discovered that the dungeon's monsters had begun to counterattack them. "You've been trying to conquer me for so long without success, so it's not unreasonable for me to launch a counterattack, is it?" Qin Mu, Lord of the Dungeon, Final Boss, Most Demonic King, Father of Rimuru, Creator of Ainz Ooal Gown, Spider's Beloved, Person Who Reads "Dungeon Meal" as "Dungeon Do," Master of Interspecies Appraisal... and so it goes.