I have created a funny, but deadly Dungeon in another world

Many think of the afterlife, some think they will face the judgment of God, some think they will only fade away in the darkness of nothing or that they will be reicarnated in another world. Like any nerd and otaku, Kaio belived/hopped that will be the last option that would happened to hum when he died, and that's what happened to him, he just didn't expect it to turn into a dungeon.
Now he will have to adapt quickly, if he want to survive in this new world, that seems like a mixture of a western fantasy world and eastern cultivation, as possibly the only Dungeon in the world.