Itachi sought to protect his younger brother from Uchiha Madara. To that end he used a jutsu to implant his Mangekyou and its techniques into Sasuke. When Sasuke's Mangekyou was initially activated, it resembled the version seen in Itachi. Later Sasuke's Mangekyou took on this form. It is unclear if this is the Eternal Form of Mangekyou, combing the form of Itachi's Mangekyou and that of Sasuke's, or if it is simply Sasuke own singular Mangekyou form alone.

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