Fortress, what do you think about the cost of building it?

I mean that she needs to be weakened somehow, because you can't get 1000 skeletons on the second level, and you can already annex with a diplomat on the first level if you have the skill.

Then the whole game will boil down to catching a diplomat, and it will be too straightforward. Reports like "he joined, I didn't," again, money for joining when they ask for it, what will you build with?