User blog comment:B1littlehero/Speculation of the Origin of Species/@comment-160529-20140611064056/@comment-160529-20140611153318

I definitly think that the traveler is not what we think it is, I have considered a few possibilities... but there wouldnt be this much mystery around it, if there wasnt something shocking they were hiding.

Vex I personally believe came from Venus' past, laying dormant on Venus until the planet was habitable again... and that their experiments with time travel, and time manipulation, are an attempt to bridge the gap and bring their creators into the future... as was their original design.

I think that perhaps their connection with "The Darkness" is born out of desperation, as the Darkness could possibly have the ability to accomplish this... The Vex are very clean, very alien, and very strange... I dont get the sense looking at them, that they owuld be this hostile without some sort of desperation driving them.

As for the vex working with the fallen, I strongly believe those were rebuilt units salvaged from battles.