The Alliance: A coalition of Humanoid nations who unite under one banner Millenia ago to present a united front against dark forces. The inciting incident was a demon led invasion of the Kingdoms which included armies of evil leaning humanoids and various monstrous races.
Races included in the alliance: Most non-Evil Humanoid races, selected sentient monster species who are not prone to destruction(Intelligent magic beasts, good dragons etc)
Races excluded from the Alliance: Evil Humanoid races(Races prone to demon worship like the drow or War prone races like the orcs), Slave driving races, monstrous races prone to destruction (Chromatic dragons, abberations etc)
Minstrix: The capital city of the Alliance, chosen both because it is one of the most important trade hubs across the bounded sea and because it was where the Alliance was first ratified. It comprises of 4 notable sections:
The administrative district: The adminstrative heart of the city nestled within the upper district, it is the work place of every city official and Alliance diplomat. The central building is the House of Elders, a building which serves as the meeting place for the Alliance leaders(Kings of the smaller kingdoms that make up the Alliance, Archmages, Legendary warriors and super important merchant families). There is a number of large homes set aside for the leaders of the Alliance who choose to stay within the city in this district itself. Though most choose to stay elsewhere and make the trip into this district for important matters.
The upper district: As its name suggests it is where the majority of the city's elite stays. It is also where many of the guilds choose to have their headquarters. Besides the residential estates, there is also many merchants that sell exotic or magical goods shipped from every corner of the world. Lastly, it is the location of the most prestigious places of learning in minstrix, ranging from trade schools, martial training halls to even the only mage training school run by the mage's guild.
The lower district: The largest part of the city by far it is here where most of the citizens of Minstrix live and make their living. It is also here where the port of Minstrix is located, where ships are constantly docking and departing. The central market of the lower district is one of the busiest in the world, said to sell functionally any mundane item you could ever want to buy.
The undercity: Not technically a part of Minstrix but due to its size, Minstrix has one of the largest sewer systems to be build. Those who cannot find home within the city itself then to escape down into the sewers below. Many generations of this has let to the undercity becoming transformed into almost another district. Large caverns have been dug into which were the perfect building ground for various dens of crimes. Everything that Minstrix has outlawed can be found here, illegal brothels, gambling dens, fighting pit or even dark temples which venerate demon lords and dark gods shunned by polite society.