Underdark (the Darklands)
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The Underdark is a vast network of underground caverns and tunnels beneath the surface of Corwyn. It is home to entire cities filled with exotic beings and strange deadly monsters roaming the passages between.


The Underdark is actually made up of several distinct regions:

—The Upperdark; which consists of caverns located in the first three miles below the surface. It was here where the surface dwellers and those in the Underdark most often met.

—The Middledark; which consists of caverns located between three and ten miles below the surface, this layer was where most of the Underdark cities were located.

—The Lowerdark; which consists of caverns located deeper than ten miles below the surface, the Lowerdark was where even those who knew the Underdark were loath to go.

The Underdark is not one giant cavern under Corwyn, but rather, many huge networks of caverns and caves. As a result, it is not always possible to travel from one end of the Underdark to the other. The Underdark is divided into several regions that were similar to continents of the surface world above. While it is possible to travel from one place to another within a domain, separate domains tend to have very few passages linking them.

Light sources are almost universally absent in The Underdark, save for the occasional luminous crystals called "Lazurite", or fungi called "Luciferus". Large swaths of the underground world are also completely bereft of food or water, making it a necessity for explorers to carry supplies with them.

The Deep-Gates


One method of travel in the subterranean world below Corwyn is via ancient magical portals called "Deep-Gates." It is a unknown who built the first one, but the Dark-elves copied them and later constructed a network of these devices to suit their own purposes.

Ecology


The Underdark is home to many species, but the most powerful and feared are the following: the Aboleth, Dark-Elves, Mind-Flayers, Duergar, and Svirneblin.

There are many settlements in the deep caverns below the surface of Corwyn:

Drow Elves: 24 city-states

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Duergar: 15 cities

  • Grunthorigard
  • Arskraag
  • Buruknir
  • Norgrim
  • Rhakka
  • Traask
  • Undrak' Thar

Svirneblin: 9 cities

  • Reth Malag
  • Kheldarak
  • Sefuldra
  • Reshov
  • Na-Drak
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Illithids: 7 cities

Kuo-toa: 12 cities

  • City of the Glass Pool
  • City of Glimmering Shard
  • City of Reflecting Pool
  • City of the Purple Chasm
  • City of Murky Depths
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Aboleth: 5 cities