Board Thread:Fourth Databook/@comment-4271790-20141104211032/@comment-945885-20141105032927

The 'R's are truly the most interesting section of this book...

Limbo Hengoku, Kekkei Genkai ninjutsu used by Madara. I think we already know pretty much everything about this, but one interesting tidbit is that the invisible world (Limbo) is called a parallel world (世に隣接). I'm not sure if that term had been used before.

From here on, there's some info on the Six Paths Treasured Tools, and the rest is very short descriptions of minor techniques.