A question about LA Ermor

[Darkwind]

I'm new here, but I don't think anyone's asked this question, and it's possibly important for game strategy . . .

I know that the dominion raises unburied corpses, but do at least some of the freespawn not depend on population? Does Ermor still get its longdead when there are no people left in the province? I just started a game as them, and I'm wondering whether I should take those provinces with my dominion before they're empty of all people or wait until they're empty and charge in when the enemy can't support an army.