Ryōiki Shinshin

Ryōikishinshin is unique Mangekyo Sharingan technique that manifested within the left eye of Sadao Uchiha, and allows the user to manipulate Truth, the quality or state of being true. Using this technique, he is able to alter the past, present and future events. Because of its unique abilities, it was declared a by the Hokage after the founding of the village.

In doing so, the user is able to state anything as fact, or lie about something to inturn make it a fact, thus manifesting it as being true. This allows them to heal injuries by stating they aren't hurt, or inflict wounds by simply saying so. By extension, Sadao is able to turn the most basic of techniques into lethal ones by empowering them with Ryoiki Shinshin. When utilized in tandem with genjutsu, the user is able to manifest them into reality as if they were real. Because of his Ryoiki Shinshin's ability, Sadao's could put normal commands on par with without the use of genjutsu, which gained him infamy during the Warring States, allowing him to manipulate his opponents with mere thoughts. Because of the sheer magnitude of this ability, upon death, all changes that occurred will stay as if it was always that way. Using his left eye, Sadao is able to use Ryoiki Shinshin to manipulate truth concerning himself, while his right eye allows him to manipulate truth concerning others.

Trivia

 * Like 's usage of Kamui and unlike other Mangekyō Sharingan users, Sadao's continuous usage of ??? does not seem to cause his eyesight to deteriorate.