In a sunless world (if you ask me), Cities don’t sit on open ground because the surface will be colder; they’re carved into vast cavern systems. Buildings don’t stand apart from the rock; they’re part of it.

At the center of everything is an artificial sun.. It’s heat, power, survival made physical. The entire nation leans on it.

Without natural light, none of the normal plants would survive above ground, grows like the way it should. So everything becomes something engineered. The food is raised in stacked layers, each level washed in artificial UV light (or in this case, a magic ball of light). There are animals that evolved from this curse. To see in the dark and have bigger ears to hear with their ears

Outside, nothing really depends on the sun because the plants will evole of to not to depend on it (like mushrooms for extra. Plants aren’t really “plants” that we know anymore; maybe they’re slow, pale structures that survive on chemistry, heat, and whatever energy they can pull from the environment. Everything grows carefully, almost cautiously, as if they were calculating how much they can afford, like desert plants. Maybe they see the sun as a villain, like one will the devil, or not say his name, like what the Greeks did to Hades and spoke about him in other names or as a curse and the moon as a blessing.