My Underground Palace Can Level Up

Traveling through the world of immortality, his spiritual roots were destroyed and he was told that he would never be destined for immortality in this life. Lu Xuan thought that he could only wait for death in a mortal village in this life, until an underground palace emerged from the depths of the sea of ​​​​consciousness. The underground palace does not teach skills or elixirs, but only follows a set of precise rules: kill monsters, nourish the environment, upgrade the environment, and spawn stronger monsters. The dead slimes feed moss, the moss goes crazy and feeds fungus beasts, the dead fungus beasts change the soil, and the live soil attracts ancient relics. Nested layer by layer, self-consistent, never-ending. While the monks were fighting for their lives for a low-grade spiritual stone, he was harvesting the essence of all spirits in the eighteenth floor of the underground palace. When he led the cub, which was covered in chaotic mist, out of the mountains, the passing Jin Dan master almost fell into the clouds. "Fellow Taoist, you... Is this a real dragon?" Lu Xuan lowered his head and touched the cub's head with a calm expression: "No. The final form of slime on the first floor of the underground palace."