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I suggest introducing restrictions for Necropolis after all!
Having some experience in the game, I can assure you all that Galtran (freely selectable, as it is not prohibited), after building the "Necromancy Amplifier" (which is also not prohibited!) and upgrading vampires in the second week (which is also not prohibited by the rules!!), becomes practically invincible in the hands of a reasonably intelligent player! You don't even need to build cavalry; it's enough to place vampires with the castle on the first week, upgrade them on the second week, and you can take everything! Almost everything can be conquered! Insane accumulation of experience and skeletons! By the end of the third week, Galtran has at least 800 skeletons, level 14-16, and confidently takes any Utopia, etc.! (you don't have to go far! I myself took a tier 3 Utopia on the third week with level 22 vampires (with a hidden stash) and 530 skeletons, practically without losses! (of course, with "Raise Dead"). Who can stand against such a monster??? It's just NOT INTERESTING!