If anything shaking up the formula might force those of us who have at least become familiar with it to figure it out again. Though, I'm not sure how many times I'm willing to waste 200+ hours to do that. That was my point about ruining the class. I think if it gets any harder than it already is you'll end up with no one playing mummies except the same one or two people (and it's probably already like that now).

One thing that might make sense is to have a multiplier or check based on how many other mummies exist at the time. I'd also encourage the imms to find a way to make Lich quests more readily available. Nothing manages the mummy population like a strong Lich.

Well, a strong lich and any villager with landslide and/or calming.