According to the records of some ancient sacred lands, in the Ancient Times approximately a million years ago, three invincible Alien Demon Monarchs were born. They descended onto the Heavenly and Myriads of Realms, each comparable to an Ancient Monarch, overpowering everything under the heavens, terrifying the entire era, undefeatable, causing countless living beings to suffer greatly.
At that time, it coincided with the succession of two Emperors, the old Emperor abdicated, and the new Emperor ascended the throne.
The abdicated old Emperor disappeared without a trace, completely vanishing from the world, while the newly appointed Human Emperor, though powerful and capable of utilizing the most formidable legacy power of Ten Thousand Domains, had not yet fully mastered that legacy power, and he confronted the Alien Demon Monarchs for a full millennium.
