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Underdark
The World Beneath
Back to Cosmology
The Underdark is commonly thought to be underneath the material plane, however no matter how deep you dig you'll never reach the Underdark. While the barrier between the Underdark and the material plane is very thin, often entrances appear to be normal caves, ravines, or sinkholes. In rare cases where the barrier is especially thin if travelling underground and you trip or fall you may end up in the Underdark.
The Underdark is an infinitely sprawling connection of tunnels and caves, underground seas, lakes, and rivers can also be found. There have been attempts at mapping the plane but have proven fruitless due to the complexity of locales. Most parts are shrouded in complete darkness while other areas are lit in dim light by glowing fungus or by the settlements and towns that are scattered few and far between.
Many races have made their home in the Underdark such as Derro, Drow1), Duergar2), and Illithids.3) There are also many monstrous creatures such as Aboleths, Beholders, Cloakers, Kuo-Toa, and Driders.