In my latest plot device, I finally discovered something.... Although I never realized it before, my story does indeed take place on earth, and, despite having a strong mediaeval overtone, actually takes place centuries from now.... A great event explained in my tale is very similar to the Norse "Ragnarok", the end of the world. Ragnarok is triggered one of two ways, and done by one of two entities called Envoys (A good one, and an evil one). When an envoy calls for Ragnarok to take place, all life and civilization, save a few humans and animals are eradicated, essentially restarting all humanity in an Adam and Eve like way. It was then I saw, since all idea and sense of civilization was destroyed by Ragnarok, countless Ragnaroks could have taken place within my world. A Ragnarok could have destroyed the Biblical world and created the time of cave men, my world could just be another awaiting complete destruction at the hands of Ragnarok. To me, I felt odd about the idea, but it also seems.... Fascinating to me. Ideas on this? I'm curious.