Hjálm

Hjálm (Helm City or just Helm) is the underground capital of Dwarven society on Hyperborea and one of five major Dwarven cities. It is located within the the Pyr-facing side of Hyperborea's equator.  The other four cities, Austri (East City), Vestri (West City), Norðri (North City) and Suðri (South City), are an equidistance away from the central Dwarven capital, Hjálm (Helm), in their respective directions. (All five cities are named after an Old Norse kenning for the sky.)

Hjálm is the most advanced of the five cities. It is a dense, cyberpunk wonderland with a high fantasy Dwarven touch. Helm is cut down the middle by both light and darkness, earning it the nicknames Eventide and the Gloaming Gulf. This light diminishes when descending further into Helm, but it is hardly noticed by "The Neon City that Never Sleeps". 

Helm is divided into nine levels known as Realms (or Levels); each level is partitioned by a disc-light structure. The gleaming, emerald towers atop the First Realm extend far outside the equator, while the construction on Realms Eight and below is neverending.