Tin foil hat time....but if I had to put money down? The darkness is exactly what it says it is, darkness. Or the inevitable end of all things, all life, all light...the death of the universe. The traveler and light is the struggle of sentient beings against the inevitable end, and possible ways to survive it. I don't think it's coincidence the traveler cards use the term alpha Lupi. That is a real star in the galaxy near where the largest super nova in recorded human history occurred. The sun died and ate up all the nearby worlds.