User blog comment:B1littlehero/Speculation of the Origin of Species/@comment-24013204-20140611172200/@comment-7622429-20140611214053

So, where does that leave the Vex? It's clear they aren't fully robotic, like the Exos, but were they created by Humanity as well in some different time (at least originally), or are they the product of aliens? Or maybe even the ultimate synthetic army of the Darkness itself? Who knows? Only Bungie does.