Board Thread:Wiki Discussions and Support/@comment-5273810-20150222091221/@comment-5407586-20150222092439

Hagoromo didn't create the Moon by himself, he did it with his brother's help through the Six Paths — Chibaku Tensei, the same technique Naruto and Sasuke used to seal away both Kaguya and Black Zetsu. I think that Outer Path is the path that involves every Rinnegan jutsu not categorised under any of the other Paths, but nothing in the manga confirms that, so…