Without a doubt warhammer 40k. It's such a dark environment where mankind is the feeder of chaos, one word about the emperor not being a god will get you shot, a biological weapon from another galaxy causes immense devastation with just a scouting fleet. The Orks seed over planets and cannot be stopped, the elder predict die to unleash the god of death "destroyer of chaos", the necrons plan to seal the material world from the immaterium undoubtly killing all of life in the galaxy. It is this world that 1,000 people are sacrificed every day in mankind to the emperor and more and more people turn to chaos to avoid the controlling government of mankind. The world where the only person that could save us, is strapped to a chair, and he is dying. If the emperor of mankind dies, the galaxy as we know it, will be destroyed.
So yeah pretty bleak.
What do you think is the most detailed setting of any [movie]?