The World of Cultivating Immortals: Destroying Immortals and Slaying Gods

Among the corpses and skeletons, a nine-headed giant turtle carrying a sacred monument stands proudly between heaven and earth to defend the ancient undead. Nine huge ice coffins are burning in this land of death. The ice burning covers all the immortal corpses and demon bones here. There is a powerful aura of the king in the ice and fire! However, it has not changed with the passage of time. What do these nine ice coffins represent since they were burned in ancient times? Why has no one discovered these nine burning ice coffins in the world of cultivation so far?