Chapter 251 - Episode 92 "The Tail

Hanmosidun City lit up with lights, the tiny gleam emerging from the stone buildings made this city appear like a small town on the surface. Unlike the Dark Elves, the Gray Dwarves don't detest bright lights; when they want to appreciate colors, they will light up these flames.

However, there is another saying that these lights are intentionally lit by the Gray Dwarves to distinguish themselves from the Dark Elves. This way, travelers from the Underworld gather in this city like moths to a flame. The Gray Dwarves use this opportunity to promote their goods or "entertain" these wealthy merchant caravans with their unique methods.