Board Thread:Naruto Discussions/@comment-24898250-20140730025315/@comment-24519434-20140806081058

WindStar7125 wrote:

Susanoo requires double Mangekyo.

You need Tsukyomi and Amaterasu to make basic Susanoo without legs. But the lower half of Sasuke's Susanoo is generated by Itachi's Susanoo (Madara's Susanoo is generated by Izuna's Susanoo). But the special ones with the long noses are created by the Rinnegan.