| abstract
| - The entrance to the sanctum is sealed with an incredibly complex sealing formula, only able to be decoded thoroughly by those possessing the Mangekyō Sharingan. The code itself was also inscribed by the eye's very first wielder, Madara Uchiha, as at the time, he was the only one who possessed such a power. In time, Sayuri Uchiha would also successfully gain entrance to the sanctum upon using her own Mangekyō Sharingan to do so. Within the sanctum lie many secrets, such as diaries, journals and scrolls containing the history of not only the Uchiha Clan, but the shinobi world at large. Among other research papers are the translations of the Uchiha stone monument, courtesy of Madara Uchiha, as well as the true secrets of the Rinnegan, who is presumably how Orochimaru was able to gain the knowledge he did, despite never once possessing even the standard form of the Sharingan. The sanctum is home to a massive underground library. Books here stray from as complex as Kaguya's reign, to as peculiar as romance novels. Sayuri has also noted an additional vault within the basement requiring a user of the rinnegan to unlock.
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