There's a Crazy Lich in This Dungeon

[Quick Freeze] + [The Protagonist Is Not Human] + [White Claws Behind the Scenes] + [Summon of Heroic Spirits] Bad news: Roland, a graduate student, died suddenly and was reincarnated into a different world, becoming a weak dungeon monster. Good news: The monster he reincarnated is the last lich in the world. He can summon an endless army of undead and historical heroes with [legendary] combat power. At the same time, he has the Book of the Dead in his hand that records countless high-level magics. In time, this boy will become a great weapon. But for Roland, who had just traveled through time, he had nothing and had to start from scratch. The enemies he has to face are the powerful monster boss in the dungeon, the team of adventurers who cooperate with each other to kill monsters, the villains who committed heinous crimes and fled to the dungeon, the Witch Church with an unknown purpose, the time-travelers who are also visitors from other worlds, and many mysterious forces hiding in the shadows. Roland needs to build a base, occupy resource points, explode troops, expand his power, and launch a larger-scale underground war. Abominations, crypt wights, gargoyles, banshees, black warriors, death knights, bone dragons... When all parties realized that the real terrifying thing occupying the bottom of the underground city was not a ferocious beast, but a lich trying to return to the surface, it was already too late. Absolute strength, the madness that comes from this, teaches you to challenge the world... This book is also known as: [The days of sneaking around in the dungeon], [Whatever doesn't kill me will keep me alive], [It must be cool to smash excrement into the abomination and then explode it], [What is it like to become an undead that expands like the Zerg]