The Underdark

The Underdark is the name of the enormous system of subterranean caves, caverns, and tunnels located beneath the surface of Exorsia.
Location: Between 3 and 10 miles beneath the planet's crust.
Temperature: Cool (−0 °C to 20 °C).
Demonyms: N/A
Shared Characteristics: Gray to obsidian black skin and fair, commonly white hair.

Geography: 

Large subterranean tunnels deep beneath the earth filled with bioluminescent plants, fungi and vast underground lakes.
The temperature underground varis according to depth and the proximity of thermal activity, though it is usually slightly clammy or chilly, with the underground lakes being dangerously cold.

Type

Underground / Subterranean

Location under

Exorsia - Material Plane

Included Locations

• Ungol’karas

Included Organizations

• Children of Lolth
• Dûrgmust Kur

Inhabiting Species

• Deep Gnomes
• Drow
• Duergar
• Spore Giants