KARKA

Between the endless storm of Nimre and the swirling fires of Azar is the Realm of Karka, made up of the shadowy duskrocks. Dense, and mineral rich, and sheltered from the sun. The lightless Duskrocks are home to terrifying creatures of the night, huge burrowing monsters, and nefarious civilizations of secretive races such as the drow and duergar, in constant war with each other.

Geology - Sunlight doesn't penetrate the storm clouds above, and much of the rain is absorbed by the Storm Rocks. There are scattered rain showers and waterfalls. The Dusk Rocks are big and Dense. There are large lakes and rivers, along with immense caverns. Underdark races make their homes here, along with fungi and creatures of Earth.