City of En...
ok, one possible city...
En..., also known as the City of Magic, boasts, or perhaps suffers, the densest concentration of spellcasters in the known world. Magic is everywhere in the city and the value of things is measured by the magic involved. Your rank as a citizen is directly related to how much magic you can cast. [indeed, the non-spellcaster is legally no more than property, to be disposed of at the whim of the spellcaster. This is not true in practice because the city depends on trade, and one can't expect merchants to come back to a city that allows fireballs to be tossed at them by irritated customers. So the non-spellcaster can walk the streets in safety, tho not without scorn.]
There is indeed an overload of magic in the city, which has been totally destroyed by fluxes in magic at least 10 times, a point that bothers the average citizen hardly at all, certainly far less than less drastic fluxes. [When the entire city, including you, has been destroyed, you support the effort to restore things to normal. But for lesser changes, well, some people like having antlers this year, and many will argue having the castle floating in the air is an improvement. So while the averge citizen is aware that he and his were utterly destroyed only because all the mages are busy and he can't get one to work for him until next week, he does notice that all the cats now have wings.]
The city is ruled by the Council of Archmages, who do not allow anyone to even approach them unless they are at least able to cast 5th level spells. To actually sit on it requires 9th. Despite this heavy mage background, the Council is viewed as a hindrance on mages, and quite correctly so. As noted, all the magic is made possible by the trade flowing thru the city, and the archmages know this. Accordingly, even tho the law is of mages, for mages, and by mages, the mage appearing before the Council usually loses out to a merchant.
While wizards dominate the city, all other spellcasters are welcome, with the welcome measured by their power. Some of the Archmages are priests [who are deemed mere lackies of their god, who is deemed just a mage with an ego problem - tho that opinion is kept quiet. All mages have ego problems and telling a ultra-powerful mage he is not a god is asking for a short life.]
The city skyline is notable for having no city wall, a point that attracts an army about once a century. A few survivors are allowed to escape so they can remind the next generation to ask why there is no wall before they try to attack. What is common are mage spires. It is a point of ego satisfaction to have the tallest tower your magic can support. Needless to say, rarely does a year go by without someone making their tower a bit taller than they can support.