Board Thread:Speculation House/@comment-14138255-20141003002601/@comment-24219008-20141003182455

@Prismatic

Yep, looks like it. Based on a lot of the things that have been said throughout this volume so far, it seems as though each of the Kingdoms (or at least Vale) is surrounded by a giant wall to keep out the Grimm.

Think Attack On Titan. It's actually a lot like that.