Alright I've had this idea in my head for a while now and wanted to get it out. The story or final raid of D2 or possibly even D3 could be the guardians, having learned how to use powers of the Darkness along with the Light, end up facing a Light-based civilization that is super powerful and views us as tainted with Darkness so attack us. And we start losing, so eventually the Vanguard decides to send our Guardian/s back in time to fix it. Except we go really far back and get to experience the Golden Age right before the Darkness attacks, and then all the events leading up to D1, like Twilight Gap and the Great Disaster. There could be like whole patrol areas in Old Earth before the Tower was raised. Then finally we come back and we defeat the Light-based civilization and then we're done. Thoughts?