Izanagi

Izanagi is a Sharingan dōjutsu that the Uchiha clan deemed forbidden. According to Madara, it is the most powerful of any genjutsu an individual can cast. When used, the caster removes the boundaries between reality and illusion, allowing the users to reinforce his vision of reality on himself. In doing so, the user can take any injury, even death, and deem it an illusion, but it can render user's attack as reality. Izanagi was forbidden because it only lasts sixty seconds and once used, the Sharingan used will go blind instantly and close tight forever.

Izanagi's result differs from person to person, meaning they have difference in limit on how long he/she can hold izanagi in effect. When 10 sharingans were implanted to Danzo by Orochimaru, they were forcibly extended to the maximum limit (60 Seconds).

Danzō, in an effort to make practical use of the jutsu, implemented ten Sharingan eyes into his right arm, allowing him to survive fatal injuries many times. However, this technique requires a great amount of chakra.

Influence
Like the various jutsu gained from the Mangekyō Sharingan, this jutsu is named after a Shinto kami. In this case it is Izanagi-no-Mikoto, who, together with his sister and wife Izanami-no-Mikoto, created the islands and other deities of Japan.

One of the most famous stories about Izanagi-no-Mikoto tells the tale of how he goes into Yomi, the Japanese underworld, to retrieve Izanami-no-Mikoto after she died giving birth to the Shinto fire god Kagutsuchi-no-Kami. After he fails to retrieve her and leaves Yomi again, he washes himself in a stream. As he cleans his left eye, Amaterasu-Ōmikami is born, as he cleans his right eye, Tsukuyomi-no-Mikoto is born, and as he cleans his nose, Susanoo-no-Mikoto is born.