Board Thread:Rebirth: Applications/@comment-1399043-20141001150312/@comment-1399043-20141002210906

To answer your questions, Ninshuu didn't necessarily die out it just wasn't preferred over the more offensive ninjutsu. But it was never stated that it was completely lost. I am proposing an order of ninja monks who preserved it secrets and who are only known to a few individuals in the ninja world as most would have presumed that they died out with Ninshuu. Also the knowledge is locked within temples that are incredibly difficult to discover or infiltrate.

To answer the first question, the offensive form of Ninshuu for the order is found in when Senjutsu is applied to it, making Kitoujutsu. But rather than doing the shape and nature manipulation within ones form, they do it outside forming a link with the environment.

The choice was made by Ryouga who studied different ways in which Ninshuu could be used and when it was discovered that he could infuse Senjutsu into Ninshuu, he taught it to his followers who in turn preserved the knowledge.