I know that NCF exists, but if there were a city and dwellings for the Nagas, then the implementation of new cities, as suggested above, would only depend on the script and its testing using the Nagas as an example.
That's right, we need to develop this topic further, because I've suggested something similar several times, and people just say "well, maybe it could work" and then it dies down. Is no one interested in creating additional cities without replacing the old ones? Of course, I used the Nagas as an example, but it could be Fortress (swamp), Conflux (elementals), or even Teletubbies. The main thing is not to replace the originals.