The necromancer empire is fine by me, as long as it's not trying to bring back some sort of ancient leader named Kerghan the Terrible/Worse who's bent on destroying life as we know it. It could be quite fun even. Your necromancers could break into the hobbit granaries on Pelagia and steal corpses. Or maybe kidnap exiled gremas from Ur. You could even combine your two ideas : A paranoid dwarven necromancer empire specialising on armour made of ... BONE!! Or I could just mind my own nation, eh?