Idzumo

Idzumo is one of the highest levels of genjutsu in existance. It, like its sister technique,, stems from the , but is unique to Ryun Uchiha's. It is said to represent the "Unavoidable World of Pain" (苦心の世界, Kushin no Sekai).

Like, Idzumo doesn't require eye contact to preform, simply the necessary chakra and the eye technique. Once cast, it mentally transports the user and the victim into a pitch black realm where only a crescent-shaped moon is visible. In this world, any damage done to Ryun in the illusionary realm is transfered to the foe in the real world. Once the genjutsu ends, the foe has to take any damage they have given to him. Ryun can also self-inflict wounds on himself, which also transfer over to the enemy. Also, if a killing or fatal blow is made on Ryun's person, that wound also become fatal to the opponent, making this a deadly genjutsu.

Despite this, it isn't without its drawbacks. Firstly, it drains a massive amount of chakra. Ryun states that, with all of his chakra present, he can use it only twice a day. Secondly, it requires a great amount of time to prepare, due to the chakra required to use it. Lastly, the technique itself only lasts for one full minute. After that, the genjutsu fades and the damage Ryun has taken during that time is dealt to the victim.

Like Tsukuyomi, only another can dispel the genjutsu, though the regular Sharingan is barely able to do it itself. Only a mature Mangekyō Sharingan can fully dispel this genjutsu with any ease.