User blog comment:HarmonyBass/Destiny Ramblings: The Vex and why they haven't won yet. (WARNING! MIGHT GIVE YOU A HEADACHE!)/@comment-25932172-20170609014644/@comment-160529-20170609120933

not really super mysterious if you look at all the details, their birthplace is on mars, in a massive underground place... and they worship the darkness.

Given their species physical biological structure they were likely uplifted rather than developing technologically on their own.

which seems to be a hobby of the traveler...

As for the exo stranger, while she is said to be from the future that hasnt been solidified to firmly in canon so I wouldnt bank on that.

I would bet she is an agent of Osiris OR the Nine though, to me it seems more indicated taht she knows the relationship between the Light & Dark is not what it seems to the guardians.