rebellious
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With a Fortress on a hill, there are potential exploits that are difficult to track. For example, upgrading Angels in the Fortress before capturing a Utopia can be done before building the same troops in the city. This is just one example that comes to mind. There could also be random troop upgrades or upgrades of forbidden troops. Therefore, the wording regarding permissions needs to be carefully considered, or the use of such a building should be restricted on specific map templates. And the capabilities of the AI player in this regard should not be underestimated.