User blog comment:Babysync/Dust/Aura link speculation/@comment-13488655-20130823113704/@comment-4773581-20130823115714

Except the history given implies that there weren't hunters at the time, and that humanity was getting curb-stomped pretty badly by the Grim up until they discovered their means of fighting back; Dust. Before Dust? Something akin to absolute slaughter, most likely. And it definitely wasn't the Grim getting slaughtered.