User blog comment:Sethril/Destiny: Lore...of sorts..../@comment-107.200.106.28-20141022150738/@comment-166.137.252.59-20141125004424

The exo were created by Rasputin (and possibly the other warminds, if any others survived) to combat the darkness, my guess would be that they were created originally as a form of cannon fodder, or at least a way to prevent having to send any of the remaining humans into battle. Though one of rasputins grimore cards states that he 'cast off his shieldshook his shoulders and the billions fell off into the ash.' Makes me think that he sacrificed humanity (or at least most of us)to give him the power needed to fight the darkness.