In the vast expanse of the universe, there existed a planet named Cyborgia, a world of unparalleled cybernetic and technological advancement. This planet was home to a unique race known as the Cyberones, beings of immense intellect and mechanical prowess. The Cyberones owed their very existence to a divine entity they revered as the Beast God. His true name was Yamata, but to the Cyberones, he was simply their creator, their protector, and their guide.

For eons, the Cyberones thrived under the watchful eyes of Yamata. Cyborgia flourished, its cities reaching the skies, and its knowledge surpassing the bounds of known science. The Cyberones, with their intricate blend of flesh and machinery, were the epitome of perfection in the cosmos. Yet, like all things, the era of the Beast God was nearing its end.

One fateful day, the skies above Cyborgia darkened, and a palpable sense of change swept across the planet. The Cyberones gathered in the Grand Hall of Lumina, the central nexus of their civilization, sensing that something monumental was about to occur. In the center of the hall, a radiant figure began to materialize—Yamata, the Beast God, in all his glory. His form was both majestic and imposing, a blend of organic and mechanical, his eyes gleaming with an otherworldly light.

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"Cyberones," Yamata's voice echoed through the hall, reverberating in the very core of every being present. "My time is ending, as the era we have known comes to a close. But fear not, for my legacy shall continue."

A murmur of concern and curiosity rippled through the crowd. Yamata raised a hand, and silence fell once more. "From my lineage, three siblings will be born after a millennium. They will carry my essence, my strength, and my wisdom. These three will be your new protectors, your new guides. The oldest among them will serve as my vessel, ensuring that my spirit remains with you always."

As he spoke, a soft, golden light enveloped Yamata, growing brighter with each passing moment. "Prepare for the future, my Cyberones. Trust in the prophecy, and embrace the changes to come. For even as I fade, my spirit shall watch over you."

With those final words, the light intensified, engulfing the entire hall. When it receded, Yamata was gone. The Cyberones stood in awe, their hearts heavy with the loss of their divine creator but filled with hope for the promised future.

Thus, the era of Yamata, the Beast God, came to an end. The Cyberones, driven by the prophecy, turned their gaze to the future, preparing for the arrival of the three siblings who would herald a new age for Cyborgia.

And so, a millennium passed...