Juristis
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As I see it, that Faerie upgrade is nonsense, and nobody would do it in the first week, even if it were allowed. It's essentially the same as not placing Birds. And even if the level 2 dwelling is built, Citadel is better than the Faerie upgrade. Without Oil they won't be able to break through anything properly, and with Oil you'll manage even without them. Meanwhile, the opponent will crush those Faeries in battle and not even notice.