Hypothetical: What if a few Guardians used the Vex Time Traveling machinery to travel back in time to the Golden Age to warn the Human population? Or even before we first encountered the Traveler to warn of impending trials and tribulations? Could this be made into an expansion or even a story mode tell all that could show the rise and fall of human dynasty? Think about it, let me know what you think.
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Time paradox. Since the guardians warned about the the darkness, the golden age could prepare and defeat it. That would mean the ghosts shouldn't exist, therefore no guardians either.