Seikatsugan

Overview
The Seikatsugan is reputed as the most exalted eye amongst the "Three Great Dōjutsu", the others being the Sharingan and the Byakugan. It is said that in times of disorder, one who wields the Seikatsugan is sent down from the heavens to become either a "God of Creation" who will calm the world or a "God of Destruction" who will reduce everything to nothingness.

The first clan on Earth to wield the Seikatsugan was the Uzumaki Clan. They obtained the Seikatsugan at the same time as the Uchiha Clan obtained the Sharingan. Using the power of the Seikatsugan, Yorichi Uzumaki saved the world from the Paleozoics along with Takumi Uchiha, and Tokito Nara by wiping all of them out and created ninshū, the precursor to modern ninjutsu. For their contributions to the world, The three became revered as the Sages of Peace, and both them and their eyes rose to mythological status following their deaths; even when the Seikatsugan was later proven to exist, some dismissed it as a random mutation.

It is possible to awaken a new Seikatsugan by obtaining an Uzumaki's chakra, either by combining the chakra of their descendants, or by directly receiving it from an Uzumaki themself. To get a Seikatsugan physically, they're found in various abandoned Uzumaki shrines, making them very rare to obtain.

A number of Uzumakis have obtained the Seikatsugan, including Stan Uzumaki. The only non-uzumaki who is able to wield the power of the Seikatsugan is Kanaya Uchiha.

Abilities
Seikatsugan contain extraordinarily powerful chakra and boast enormous ocular power, such that an unworthy wielder risks "losing themselves" upon implanting one. Their full power can only be brought out by their original owner, particularly when wielding both eyes, but possession of even a single transplanted Seikatsugan can still grant overwhelming power. The Seikatsugan is able to see chakra and its flow within the body, as well as otherwise invisible barriers, but cannot see through obstructions such as smoke bombs. Possession of the Seikatsugan allows one to easily master any jutsu as well as all five basic nature transformations. The Seikatsugan is the only dōjutsu able to fully decipher the Sages of Peace's stone tablet.

The Seikatsugan is the only means of breaking the seal placed on the Demonic Statue of the Outer Path and summoning it, though it cannot be summoned using a fake reincarnated Rinnegan. The dōjutsu is also used to seal the Paleozoics inside one's body and become its jinchūriki. When one who wields the power of Seikatsu approaches the moon, they can awaken the Seikatsu Sharingan and cast the Infinite Tsukuyomi. In turn, another Seikatsugan wielder is able to repel the Infinite Tsukuyomi's light, and this protection can be extended to others by using the Seikatsugan in conjunction with Susanoo. In order to end the technique entirely, a Seikatsugan wielder must form the Rat hand seal together with someone who possesses the chakra of all the Paleozoics.