Board Thread:Naruto Discussions/@comment-1872728-20160329033053/@comment-25122992-20160501093922

Daywakler wrote: Could Susanoo be the main reason for becoming blind (note that i said main, not only)? It can also explain Obito's case. What i mean is that set of abilities (besides susanoo) mangekyo user gains are less taxing on the eye than susanoo itself. Just developing process to armored susanoo put a lot of stress on body and thus on eyes, and if u use it a few more times a vision became affected ... I think you have a point here, but rather because of particular reason. Susanoo appears to be the most exhausting technique in the MS arsenal - other ones like Amaterasu or Kamui are oneshot-technuqies who drain the necessary amount of chakra only once, yet Susanoo is a kind of technique which needs to be maintained via the user's chakra all the time. I mean, it's constantly exhausting the user and his eyes. If there would be a limit to chakra that can be used on maintaing the Susanoo, the technique would affect the user not more heavily than any other MS technique, but since it can be maintained until your chakra reserves are almost depleteled, the amount of strain on user's eyes and the whole body is much more powerfull than the one from any other MS jutsus.