Magatsuchi

Magatsuchi is a {http://naruto.wikia.com/wiki/Mangeky%C5%8D_Sharingan Mangekyō Sharingan] Dōjutsu and Juinjutsu that places a cursed seal on the Target that will give them the ability to used their own fully matured Sharingan.

Usage
Magatsuchi (禍津日神) is a Juinjutsu obtained by Kokuou Uzumaki after he developed his Mangekyō Sharingan. The use of this Jutsu is a ritual in which the target must be willing. The user will must take a sample of their blood, and drop it in the right Mangekyō Sharingan. The right eye will spin, and within moments, the target will have the Magatsuchi seal on their forehead. With this cursed seal, the target is able to activate their own three tomoe Sharingan, gaining all of its abilities, with no drawback of increases Chakra Costs. Using the left eye, the user is able to telepathically connect to the target, and see through their Sharingan. The left eye also gives the user the ability to take full control of the target, loosing their free will, and becoming a mindless drone set on completing whatever task the user gives. The seal is unbreakable, and can only be undone if the user breaks the seal, has their eye removed, or killed.

Despite being able to use the abilites of the Sharingan, those who are given the Magatsuchi cursed seal are unable to obtain the Mangekyō Sharingan, and are limited to the Eye of Insight abilities.

Influence
Magatsuchi-no-Kami is a collective of two gods that manifested from the filth Izanagi washed off from Yomi. They are the source of everything in life that is bad. The gods are Ōmagatsuhi-no-kami which means ‘Great Magatsuhi Kami’ and Yaso-magatsuhi-no-kami which means ‘Countless Magatsuhi Kami’.