Re: Amaterasu + Tsukuyomi = Susano'o
People will come and say that it needs double susanno
But the databook says this
"Two jutsu allowed to be used ONLY BY THOSE that have opened to mangekyou sharingan, the heavenly eyes that see all things in the universe, Amaterasu, representing light of the material world and Tsukyomi , the nightmare realm, representing the world of mind and darkness,
Susanno is the strength of the temptous force, that resides ONLY IN THOSE that have mastered both of these techniques "
Not to mention that in the jappanese mythology, susanno, amaterasu and tsukyomi are siblings...
it's kinda obvious imo the three are related in naruto as well
Sasuke, the guy who literally just got his mangekyou, knows almost nothing of it, and how it came about....no one told him anything about that.. he came to that conclusion himself...