User blog comment:Zathronas/Speculative author: Where are the Grimm?/@comment-23790511-20140914035557

I always assumed that the kingdoms had their own borders walled up in some fashion. Perhaps the Grimm outside those walls are the hyper aggressive ones while the Grimm that reside in "hot-spots" outside the kingdoms have been reproducing like crazy through unexplained means. Like a balloon filled with too much water, the Grimm are about to "explode" and start overwhelming the skilled warriors we've seen with sheer numbers.

Perhaps it's natures way of ensuring balance, perhaps it's the work of a hive-mind, or maybe the Grimm are intelligent beings in their own right. All I do know is that underplaying such a massive force for so long only means they are going to curbstomp their prey in retaliation... and I can't wait to see how. I'm a sucker for mysterious evils.