This was a very interesting read. well done. I just noticed that during the Maya log, she mentions SxISR being the system they're using. I wonder if the system and the device are the same thing. Because searching SxISR (or at least ISR) in the rest of the grimoire, it's mentioned in Ghost Fragment: Darkness (SxISR) and Ghost Fragment: Rasputin 5 (ISR). Could it be that Earth's defences during the Collapse consisted of the information and possible outcomes obtained from the device. And if that is the case, Future War Cult may have more to do with the Golden Age/Collapse that we initially think.