In Xianxia novels, the Age of Doomsday usually referred to the end of the world in a religion or myth. It might vary according to the plot of the novel. In some novels, the Age of Chaos might refer to a specific dynasty or year. For example, the "Shang and Zhou War" in the "Investiture of the Gods" happened during the Age of Chaos. In other novels, the Age of Chaos might refer to the collapse of the laws of the universe and the arrival of the end of the world, such as the "Great Destruction" in "The Lord of the Rings." The exact time would vary according to the plot and setting of the novel. It was impossible to determine an exact time.