[Phantasm]

As I noted in the original post, "Empire" doesn't necessarily mean "unrepentantly evil". It generally means "centralized, militant government". "Good guy" empires are bastions of law and order against anarchy (real and/or perceived), and most of the "bad guy" empires are more of a rival than truly Evil. (The Galactic Empire of Star Wars is the obvious exception.)

Not sure yet if I want to detail sub-factions inside one of the larger faction types in this primer. If I was making a full-fledged setting document, perhaps, but when making a genre primer stuff like that is likely overkilling the minutia.