The Dark City
For now the relevant points are those mentioned elsewhere about the moon. Our perceptions of such things may not apply to this world. The sun was destroyed in the cataclysm nearly a thousand years ago, it does not provide light anymore. The sun glows faintly twice a day, and people use that for time-keeping, but this glow is brief, all it does is act as a signal, it does not provide light or heat.
Most of the light comes from electric lighting, in the streets if the cost is justified by the city, and in the homes... if the cost of a generator can be justified by the owner. Many can not afford these fancy new electropasmic devices and are forced to use smokey lanterns or candles.
'Night' is therefore a bit of a weird concept here. The world is permanently in darkness, making it ideal for a life of crime.
Most of the time, the city is smokey, cold, rainy, and windy, and fog rolls in following the sun. Expect frigid winter, windy and rainy spring, and stormy autumn, summer is unheard of.
The city is densely packed inside the ring of immense lightning towers that protect it from the murderous ghosts of the blighted deathlands beyond. Every square foot is covered in human construction of some kind ---piled one atop another with looming towers, sprawling manors, and stacked row houses; dissected by canals and narrow twisting alleys; connected by a spiderweb of roads, bridges, and elevated walkways.
Akoros
A land of dark, petrified forests and rocky hills. The rich coastal cities get their wealth from leviathan hunting and from mining colonies deep inland. The Akorosi are sometimes called "Imperials" since the Imperium began there. They are generally fair-skinned and dark-haired.
Severos
A land of windswept plains, covered in dark scrub and thorny growths. Outside the Imperial cities on the coast, some native Serverosi still live in free tribes, scavenging the death-lands on their ghost-hunting horses. They are generally brown-skinned and dark-haired.
Iruvia
A land of black deserts, obsidian mountains, and raging volcanoes. Some say that positions of power are openly held by demons in Iruvia. The people are generally amber-skinned and dark-haired.
The Dagger Isles
A tropical archipelago covered in dense jungle growth; now turned dark and twisted from the strange magic of the cataclysm. Some say that the people there live without lightning barriers. How do they manage that? Native islanders are generally copper-skinned and dark-haired.
Skovlan
A ragged land of cold mountains and rough tundra. Skovlan was the last holdout against Imperial control. They are generally pale-skinned and fair-haired or red-haired.
Tycheros
A far off land, disconnected from the Empire. People say the Tycherosi (rudely called "Strangers") have demon blood in their lineage.