"That ancestor wrote in his personal notes that every few hundred thousand or millions of years, this world undergoes a catastrophe of heavenly demons. No Eternal Immortal Dynasty or super-immortal dynasty can stand by and watch, for it concerns the life and death of the entire Human Race."
Hearing this, Yelin formed a conjecture.
"I've read in some historical records that the three great Eternal Immortal Dynasties were established hundreds of thousands of years ago. Before that, this world was still in a wild state, with the Human Race extremely scarce. Facing the formidable Monster Race, Earth Demons, and Celestial Demons, they lived in constant peril. The strength of the Human Race back then was negligible compared to now."
Chapter 183