1. An ancient intelligence (it seems) that believes the only true existence is that of ruthlessness. 2. A mysterious Exo that fights against the Darkness, but not necessarily with the Traveler. 3. Possibly our future selves. 4. Somewhere in the future. The Golden Age presumably lasted for centuries, and human lifespan tripled. The Collapse and the Dark Age were also quite long. It's up to interpretation. 5. A Jovian