Грязный Итальяшка
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Definitely, the Fortress faction is the strongest. Especially due to the lava dragons, jarls, rune magic, and the fact that they also learn regular magic very well! And I'll add that the appearance of a large cloud of dwarves when defending a city is not just a serious advantage, it's outright cheating, especially considering that the building that allows you to create this cloud of dwarves costs very little.