Mugen Tsukuyomi

Mugen Tsukuyomi (infinite Tsukuyomi) is a more developed version of Tsukuyomi as the user must obtain the Chakra of the Ten-Tailed Beast in order to strengthen ones eyes and cast the Genjutsu. Consequently it is unique to the Uchiha Clan and like Tsukuyomi only those with the Mangekyō Sharingan can perform it. It is said to represent the "Spiritual World and Darkness" (精神界と闇, Seishinkai to Yami), the antipode to Amaterasu, a ninjutsu of similar power. Tsukuyomi is one of the most powerful genjutsu in existence, however Madara Uchiha describes Mugen Tsukuyomi as the most powerful illusion ever.

Mugen Tsukuyomi involves casting a Genjutsu onto the Moon, where it is said that the Sage of the Six Paths sealed away the body of the Ten-Tailed Beast (the jubi) through his Chibaku Tensei Jutsu. Mugen Tsukuyomi allows the user to project their Mangekyo Sharingan on to the moon, casting the ultimate illusion onto everyone one earth; putting everyone under the control of the caster.

Madara Uchiha's Moon's Eye Plan very much involves the use of Mugen Tsukuyomi, as he plans to use the Jutsu for world denomination. He intends to control everyone with the Jutsu and make the world one with him; he describes a world with no ill will or strife, however the four Kage's deem his plot as a bid to take over the world and Madara declares the beginning of the Fourth Great Shinobi World War. If successful Madara Uchiha will be the first recorded ninja to use the Mugen Tsukuyomi.