The vex. They are certainly the most mysterious. They bend time and space at will, have been captured and studied and still have no solid theories on where they came from or what they are. Are they a stand alone ai capable of individual thoughts and decide to work together? Or are they cogs in a war machine bent on our destruction. I've heard theories that the traveler made them and the darkness consumed them, one where we made them in the far distant future, decided we were not worthy of existence. Just want to more about them.