Everything changed with the arrival of the Traveler. Long ago, it breathed new life into our system and began our Golden Age. But it did not last. Something hit us. Knocked us down. Tried to stamp us out. No one knows exactly what, but we do know this: very few of us survived, and those who did owe their lives to the Traveler.The survivors built a city - our last - beneath the Traveler, and have begun to explore our old worlds, only to find them filled with deadly foes. You are a Guardian of the last safe city on Earth, able to wield incredible power. Defend the City. Defeat our enemies. Reclaim all that we have lost. Be brave.