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Okay, we've dealt with the dark dwarves and elementals; now let's talk about the nagas.
In principle, you could take the city design from the mod posted in the neighboring thread, but some changes should be made:
First, swap the locations of the Cap and Snow Maidens, while also strengthening the latter.
Second, increase the number of heroes, as the hero selection in the mod is very limited.
Third, remove the hero with the "Queen of the Hive" specialization (or at least change the specialization), as it looks quite absurd for a representative of this faction.
And regarding the sea elves, as far as I know, they have nothing to do with the Lotus Empire.