(Japanese-style fantasy + guardians of the social order + dungeons + faction-building + creating a dungeon like the Great Tomb of Nazarick)
After being reborn in another world, Qin Mu becomes a slime.
The good news is that he becomes the master of a dungeon.
The bad news is that the dungeon has only five slimes, all just like him.
He has to fend off adventurers trying to conquer the dungeon while also stopping invasions from other dungeons.
Qin Mu feels like his life is miserable. Every day, all he can do is turn creatures that die in the dungeon into his own monsters, barely managing to hold off his enemies.
But as he keeps holding them off, other people gradually notice that this dungeon is getting stronger and stronger.
As Qin Mu gains more and more skills from dead adventurers and the dungeon grows deeper and deeper, even the strongest hero in history can only make it to the 108th floor without reaching the bottom. Then people realize that the dungeon’s monsters have begun to counterattack.
“You’ve been trying to conquer me for so long and still haven’t managed it. Is it really so wrong for me to strike back?”
Qin Mu, Dungeon Master, Final Boss, Most Evil Demon King, Rimuru’s Father, Creator of the Overlord Ainz, Spider’s Object of Affection, the Guy Who Reads Delicious in Dungeon as Delicious in the Dungeon, Expert Appraiser of Otherworldly Races... thus spoke.
It's okay, I just feel like I could use more created life instead of being converted into slime. After all, I was killed by you. How can I listen to you with all my heart?
It is already considered a good book in Tomato, where AI is prevalent today.