Talk:Grimm (WoR episode)/@comment-203.111.224.86-20150417160703/@comment-4010415-20150417163151

Maybe sometimes people are exiled from the kingdoms. Or some people think they're capable of defending.

Or, they attempt to start up a new area for Vale to expand to, only to find out they're not prepared to defend against the Grimm they discover there, just like what happened with Mountain Glenn. According to Oobleck, Mountain Glenn did well for a while, thanks to an aggressive perimeter defense making up for the lack of natural barriers. But then, the Grimm managed to overrun the city, and they had to flee into the subway tunnels.