On the very day the Moon-Swallowing Demon King fell.
Blood flowed like rivers among the Demon Race.
Every demon who defied the Heavenly Demon Palace's decree was wiped out, root and branch. Whether they were top Demon Kings or Heavenly Being Demons, none escaped.
That day.
Every demon in the Endless Mountains trembled.
Some demons who had survived since the Demon Emperor's era once again remembered the terror of being ruled by the Heavenly Demon Palace.
When the Demon Emperor was still around.
He had established the Heavenly Demon Palace and appointed the Twelve Demon Sages to hold dominion over the entire Demon Race.
Those qualified to serve as the Twelve Demon Sages were all supreme experts among the Demon Race, each backed by a powerful clan.
As the Twelve Demon Sages rose to fame.
The clans behind them were also granted the designation "Heavenly" and called themselves heavenly demons.
The Twelve Heavenly Demon Clans.
They were the foremost clans in the entire Demon Race.
However.
After the Demon Emperor was grievously wounded and vanished, the Heavenly Demon Palace also fell silent.
For six thousand years.
The Twelve Demon Sages had never emerged from the Heavenly Demon Palace. Many demons believed they had already passed away and that the so-called Heavenly Demon Palace was nothing but an empty shell.
And yet—
The Heavenly Demon Palace still held safeguards left by the Demon Emperor, and the Twelve Heavenly Demon Clans stood guard over it. No demon expert dared barge in to test its true strength.
After all.
Even without the Twelve Demon Sages.
The Twelve Heavenly Demon Clans still ranked among the strongest forces in the Demon Race.
Almost no other clan could contend with any one of them alone.
However.
Although the Twelve Heavenly Demon Clans maintained a somewhat detached,