Rinnegan is not very difficult to create.

[~Zonta~]

I never Knew Rinnegan was created :|

Ot : Get your facts right it was not Kabuto's doing it was Obito's

You fan's brag about everything so much that u forget to give uchiha's credit where they deserve it XD

 

[Rikudo Ero Sennin]

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obito used the same tech as nagato, the six path of pains but using jins