The imperial clan revealed the truth—the way they controlled this nation, and so on.
First of all, the imperial clan itself was a giant leech, clinging to this continent and this nation as it sucked their blood. They were the only ones able to communicate with the "gods of heaven," deciding which god would descend into the world and who would serve as which god's incarnation. That was the authority they wielded.
They exalted themselves above all others and commanded the various enfeoffed Monarchs, but they also knew that some things had limits. One day, people would question whether the gods were real; one day, a Monarch's ambitions would swell.
They would cultivate children with exceptional Talent Aptitude in martial arts, using special techniques to twist their bodies as they trained, making them more closely resemble the bizarre forms of gods, and use force to intimidate the Monarchs. They would spread superstition, exaggerate hearsay, and keep the lower classes ignorant—but all of that merely delayed the imperial clan's demise. It could not grant them Eternal Lifespan through the ages.
So, the imperial clan added the setting of a great purge to their myths: every six hundred years, the Great Annihilation Heavenly Demon God would emerge. Wherever It passed, flesh and blood would wither away. It would gather a demon army to rule the world. Correspondingly, the Great Emperor Heavenly Bright God would be born in Shenjing, calling upon an army of justice to resist the demon army.
This war would sweep across the entire nation, purging every restless element and redistributing territory among the powerful ambitious figures.
And no matter which side won... it was all the same imperial clan. The first batch of Demon God Followers serving the Great Annihilation Heavenly Demon God were imperial clansmen, and there was