Yamatai

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During the Yayoi period, decades of warfare among the kings of Wa left the population of Yamatai desperate for stability. Himiko emerged as their chosen ruler, presenting herself as a spiritual leader capable of ending the bloodshed.  Her alliance with Yamata no Orochi strengthened her authority. With her human–Isu heritage and access to supernatural power, she became more than a political monarch: she was treated as a living intermediary between humanity and the Isu, whom her people regarded as deities.

However, the peace she established concealed an increasingly oppressive regime. Her authority depended on religious devotion, fear, and the belief that her rule was divinely ordained. When Amaterasu, Tsukuyomi, and other Isu-associated deities convened in present-day Dunedin, Aotearoa, Himiko continued the practices that sustained her immortality.

The turning point occurred sometime during the Kamakura period, approximately 1185–1333 CE. A priestess named Hoshi, chosen as the next Daughter of the Sun, discovered the truth behind Himiko's immortality. She learned that the revered queen had survived through the repeated deaths of her predecessors.

Hoshi understood that if the transfer succeeded, she would become another victim of the same ritual. More importantly, another young priestess would eventually suffer the same fate. Rather than allow the cycle to continue, Hoshi made a desperate decision. She obtained the Stormguard General's stolen dagger. As Himiko's consciousness transfer approached, Hoshi fatally wounded herself. Her death denied Himiko the intended living vessel. Hoshi subsequently teleported to South Island, Aotearoa, where she sought the assistance of the Kami tribe of Isu. The ritual's corruption left Himiko trapped in her decaying body. Unable to transfer her consciousness into another host, she eventually died.

For treason and jealousy, the Japanese, Chinese, Korean, and Emishi soldiers demolished the Old Yamatai; nonetheless, Himiko and her supporters were not spared and were put to death by the Japanese emperor. However, the Tenno recaptured Nihon after Himiko's son, his supporters, and his people fled to Kiribati without cause, even being escorted to the new place by the enigmatic dragon, Yamata no Orochi. The New Yamatai were now in Kiribati and concealed in historical records until the elders of Kiribati wrote about them and unintentionally revealed them to the public. However, Orochi fled to Hawaii after being repulsed by Amaterasu when she swore to the Eldritch Terror.

Yamatai is depicted as the place where Queen Himiko was buried in an elaborate tomb guarded by traps and accompanied by many maidservants, as she was suffering from a contagious disease that she wanted to isolate herself from. According to legend, her own generals brought her there in chains because she rules the empire with dark magic and spread death with just a mere touch of her hand, but the truth is that she is trying to prevent the virus that she is containing within herself from infecting the world by exiling herself with her followers and the infected in Yamatai and sacrificed herself by being entombed.

Taniwhas also killed Yamatai's guards, further preventing the former regime from maintaining control. As Polynesian peoples later occupied and navigated parts of the Pacific, the original Yamatai population disappeared from the historical record within this fictional continuity. The remaining survivors were unable to escape the cursed waters. By approximately 1600 CE, Yamatai had mostly sunk beneath the ocean, leaving a small, steep-sided rocky remnant resembling Australia's Ball's Pyramid.

This is an important detail in your modern-era lore: the Assassin Brotherhood, Templar Order, and Monster Hunter members do not care about Himiko's existence. That indifference creates a striking contrast between the scale of her supernatural threat and her lack of significance to the organizations that investigate other historical mysteries. These explanations preserve your central premise without requiring the modern factions to become involved in every ancient supernatural event.

Possible explanations consistent include:

• Historical erasure: Yamatai's destruction and the disappearance of its people leave few reliable records of Himiko.

• Geographic isolation: The storms and biological boundary prevent routine access to the island.

• No surviving political influence: Himiko can no longer command armies, govern a population, or pursue a conventional campaign for power.

• Misclassification: Any surviving reports may be treated as folklore, an unexplained maritime disaster, or an irrelevant ancient cult.

• A dormant threat: The organizations may have no reason to investigate a seemingly dead queen whose remaining influence is confined to a remote and inaccessible region.

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• https://en.wikipedia.org/wiki/Yamatai