One comment: check for consistency of acronym. You have PIED, PAIS, and PAID. Which is right? (notes she who works for a college and deals with tons of acronyms daily)

I am reminded of the three warring factions of the Makai in YYH:
those that prey on humans (Mukuro)
those that want to stop predation on humans completely (Raizen)
those that do not want to be told what to do, either way {or left alone, I think.} (Yomi)

The major war seems interesting, too. Wars cause migration and population flux, you know...