What theories do you have on the origins or purpose of the Traveler? Was it constructed by some extra-galactic species and sent to assist Humanity? Was it a gift from future humans sent back in time? Is it self-made, almost like a God?
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It probably moves from world to world advancing inhabitants to bring peace and prosperity. When that civilization achieves its golden era the Traveler moves on. Race after race desiring its power chased it to earth. We defended the traveler and we're so horribly beaten it made a sacrifice to protect us from total annihilation. Now with the Guardians working with the traveler our only hope is to reclaim all we've lost in an attempt to repel our enemy beyond the edges of Sol. Well it's the best idea I have rolling.