2Draco
Necromancers: it's either a monarchy or a democracy because the undead are clearly not a social class. It's like calling computers a social class. There's only one, and that's the Necromancers themselves, meaning those who are not subordinate to anyone and have their own minds and wills.
I defined the Stronghold this way because I think there's some kind of chieftain in charge, who had more strength and troops than the others and seized power.
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