The First Great Calamity — ca. 10,000 years ago
Vah Ruta, along with three other Divine Beasts—Vah Rudania, Vah Medoh, and Vah Naboris—were the culmination of Sheikah technology and genius ten thousand years ago. They were created to thwart a great evil prophesied by seers and divinators alike that would strike Hyrule. The Sheikah worked together with Hyrule's Royal Family at the time, gaining support and trust from the king.
Each Beast was designed and created with certain races in mind—Vah Ruta was meant to be gifted to the Zora, with vetting for a suitable Champion and Pilot in process before Ruta's construction had even finished. The Zora King's firstborn and only son, Prince Triton, was tentatively chosen to be Vah Ruta's pilot.
As Vah Ruta was finally done being built, she attempted to communicate with the Sheikah scholars and scientists running final tests and diagnostics on her via morse code. Understandably, but also frustratingly, they either didn't catch on, or were unable to decipher what Ruta was trying to say. This lead her to manifest her consciousness into a familiar form for them—the form of a Sheikah woman—in order to speak with those who created her. This was an unexpected revelation for the Sheikah, but a boon nonetheless that would make it much easier for Beast and Pilot to forge a connection and bond.
Ruta would live amongst the Zora in their domain nestled in the Lanaryu region, taking the Prince under her wing in order to teach him the ins and outs of piloting a Divine Beast. They spent much time together, naturally, forging their bond and connection (something paramount for Beast and Champion to share) to further hone Triton's abilities and finesse over piloting. The duo became two peas in a pod quite quickly, and like the other Beasts and their pilot, were seldom seen apart. They would often travel to Castle Town and Hyrule Castle during the preparation period, fellow Champions mingling in order to further boost their camaraderie given that teamwork and cooperation would be paramount against such a great and evil threat.
When the day prophesized finally came upon them, and the Calamity reared its head, they were all more than ready and capable. The attack against Calamity Ganon was fierce, with each of the Divine Beasts firing down upon it. With the Hero, who wielded the Blade of Evil's Bane, and the Princess, wielding the sacred power of the Goddess, combined with the innumerable forces of Guardians, the Calamity was soundly trounced and sealed away. Their planning and preparations went flawlessly, and while the battles was not without casualties and loss of life, their efforts mitigated the outcome from being much, much worse.
After those who lost their lives in the battle were lain to rest, and following the mourning period, a grand celebration was held in Castle Town for the Champions, and the Divine Beasts they had piloted. It was a festival that seemed to last for days, with day and night bleeding together in an incomprehensible mess with all the food and drink being offered. The purpose the Divine Beasts were built for was eradicated, though it seemed their roles still were not fulfilled entirely just yet. In the meantime, Vah Ruta celebrated fervently with the other Beasts, drinking and eating her fill and mingling with anyone and everyone who would give her their time of day.
With the Calamity sealed, the presence of monsters waned significantly across Hyrule. The Champions returned to their respective regions with their Divine Beasts in tow, and life in Hyrule for all returned to a sense of normalcy and peace—at least, for a time.
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