Now that Zavala and Ikora have built a vex gate on the tower...
What's stopping the vex from using it reverse on us and full on invading the tower? Vex should have gotten the coordinates of the tower portal by now.
Edit: So, what, did the device just fall off the tower?? It not there anymore.
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It's there so that Bungie can use the whole Vex time paradox gimmick to have us perform old activities and fight old enemies in a different 'reality'. Couple that with the Pyramid ship's whole Nightmare McGuffin and they can reskin indefinitely. That'll be a tenner, please.