This is a massive city plane, it is covered in gothic architecture, baroque statues, and a large public transit system. It is a city that may seem similar to a modern world with a cursory glance, however, once you look deeper you realize there is much more than meets the eye. Magic permeates everything on this plane, the buildings are not made of brick, but rather sculpted using move earth spells. The vehicles move with no combustion engine or mechanical engine, rather they are animated objects with wheels.
The Noble Houses rule all in this city. They control entire city blocks with their roving bands of wizard thugs. It is a city ruled by a decadent upper class made of archmages and master wizards. Their power over the arcane arts is what gives them power over the city. Meanwhile, the gutters are filled with those who lack magical powers, a small minority who are generally poor and living in the cold. They are second class citizens, who rarely can get work since most menial tasks are performed with magic (why hire a janitor when your broom can be enchanted to sweep itself?)
However, an uprising is coming. The disenfranchised have developed a weapon that will breach the gap between the wizards and non-wizards. They call it gunpowder.