Added 1 minute ago
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So, does the tool that removes obstacles on the global map (the yellow one) not work?

If only it did! After I used it, the arena in the game stopped working – black screen, and the creatures are hanging somewhere.

Yes, about the city buildings... After all, the city, or rather what is displayed when you enter it, strongly resembles a mini-map on which its buildings are actually located, and the city music plays. Moreover, some individual effects from it are still available in the editor. For example, the Necromancer's green fog in the abyss, bats (I saw them in the single-player map about Arantir, "Supreme Lord").
That's why I thought, why theoretically couldn't the other buildings be made available too...

And is it really possible to add a new subtype of city to the game? Let's say, make another Necropolis, but with only a bone pillar as the only building, and there wouldn't even be an Elder Hall, and it would look like a pillar.