Very nice setting. Looking forward to a story hour set in it.
A piece of advice. If you try to omit giving a name to the city, it's gonna take effort. You don't want to have a nameless city that does in fact have the name of "Nameless". You might want to have all campaigners in the setting refer to the city implicitly, trying to convey that everyone knows it is *the* city. Planescape Torment had a nameless protagonist and did it well, but still made a lot of fuss about it and presented its story from a first person perspective.
Then again, thinking in-game, why would a city central to the world be nameless? Better to find a really cool name for it. How about "das Nachwesen" (the after-essence, the after nature) or "das Nachdasein" (after-existence, also after-being, also after-entity).