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The improvement for a Fortress depends only on the creature's file; you can specify many upgrade levels there. For example, we have peasants, and in their upgrade, we can specify 2 types – these will be a militia and a landlord. Then, for each of these creatures, you can specify 2 more upgrades, and so on in a progression.[/B]
Is there a way to give some building the function of a Fortress on a hill, so that it can only be built after all housing upgrades are completed (so that it's fair)? :)