I was watching Pathways Out of Darkness again, and this idea struck me: the theme Bungie keeps coming back to with their previews of Destiny is [i]Hope.[/i] It's a hopeful world, the Guardians are the City's last hope, etc. What if that's what the traveler is... To the Fallen, the Cabal, the Hive and the Vex? The 5th Enemy, the unknown one, is presumably what 'knocked us down.' What if this same force was what drove all the other enemy factions into our solar system in the first place? I realize how similar this will sound to Mass Effect, but what if this 5th enemy has destroyed/is in the process of destroying the civilizations of the Fallen, the Cabal and the Hive? And the Vex's creators? If I were them, and I heard about a massive, mysterious sphere that somehow protected the last of humankind from the threat of this 5th Enemy, I'd probably be desperate enough to want to harness the power of the Traveler for the good of my own race. In short, my theory is that the 5th enemy is the reason for our solar system being overrun by the other enemy combatants. The Fallen, Cabal, Hive and Vex are all in our system to harness the power of the traveler, to save themselves--the Traveler is their last [i]hope.[/i] I included the above image in this post because I noticed, firstly, how the Fallen and whatever the larger creature is in that piece of concept art are all effected by this glowing green entity, force, w/e; what if that's the 5th enemy? Or was created by the 5th enemy? If the 5th enemy has some space magic of its own that can enslave entire species to it's cause, it would stand to reason that the only thing that could stop it would be an opposing space magic--e.g. the power of the traveler. Anyways, that about sums it up. Hope that wasn't too TL;DR. Thoughts?