Humanity is on the brink of extinction, confined to one remaining stronghold with the darkness closing in. With the last glimmer of hope the Guardians of this last great city rise to take on this emerging evil! As epic as this journey will be it simply is not a game, but a simulation. All of Bungies games deal with aliens invading humanity, and humanity rising up to defeat them. This is no coincidense, for in defeat a lesson is learned. Bungie is in cahoots with a distant alien civilization and through their "games," learn of our ways and our approach to conflict. Destiny will lead us to the heart of our enemies and to our initial victory. But with the knowledge gained from our conquest, the enemy will understand our every move! If we are to succeed in our survival, we must fail our destiny.