Board Thread:Destiny Forum/@comment-5820164-20130403210343/@comment-160529-20140925005449

All things considered I do not believe the vex have ever actually demonstrated any "time travel"

Their technology appears more analogous to "time dilation"

the ability to produce self-contained pockets of space time that move at different rates than the outside world. And we have seen and traveled to such pockets with the vault of glass andthe black garden... There is actually very little evidence to suggest they have traveled through time...

I believe this ability is part of their connection to the darkness, the Vex in my opinion were the first inhabitants of the solar system, possibly the robotic servants of a greater race... and when Venus was terraformed they may have been awoken, and I believe they entered a compact with the Darkness to gain access to time manipulation technologies in order to try and bring their creators to the present.

in Excahnge, the Darkness asked for worship... and protection for the dark Heart which was preventing the Traveler from healing.