...Well, they do attack cities, but I mean the actual city being used as a weapon. It doesn't happen often, but I had to deal with one just before I was brought here.

They're guilds that break laws and lose the recognition of the Magic Council, but continue operating regardless. Their numbers range anywhere from thousands of mages to just six. Some use forbidden dark magic to cause chaos and destruction, while others simply have no qualms with murder, but all of them are threats to the stability of the world.