The Demon Kings of the Two Realms, Starting with the Iron-Eating Beast

After traveling to the world of cultivating immortals and becoming a newborn panda cub, Xiong Yun felt that his eyes were black and his future life would be dark. Before he could denounce God, an ancient sound of sacrifice pulled him into another world. A wild world. Here, he became the sacrificial spirit of a small tribe. Cultivation and savagery. Xiong Yun straddles two worlds and begins his own journey to become the Demon King... When the wild tribes learned the techniques of cultivating immortals, refining elixirs and refining weapons, and making talisman and forming formations to deduce the secrets of heaven. When a cultivator opens a cave in the sky with his physical body. So what happens to everything? The only thing that remains unchanged is the demonic body that spans the two worlds!