The prehistoric era was a fictional historical era that appeared in many online literature. Generally speaking, the prehistoric times referred to the chaotic period in Chinese mythology and folklore where all things grew, heaven and earth were connected, and there were immortals and devils. It was difficult to determine the time span of the prehistoric era because there might be differences between the periods described in different literary works. In some works, the prehistoric times may extend from ancient times to modern times, while in others, it may only exist in a specific period of history. The prehistoric era was a period full of myths and legends. It was a very attractive topic for readers who liked fantasy novels and myths and legends.