The Underdark
Deep under the surface, there's another world. It's darker and more dangerous, but it isn't all too different from the surface world. There're cities, farms, bodies of water, etc., it's just all underground.
Geography
Under the earth, there's a system of large caves with their own ecosystems. Most of it is cold stone or soil, but there are also vast seas, mushroom forests, and wide plains covered in little mushrooms instead of flowers.
Ecosystem
The only thing that can grow in the dark, damp caves of the Underdark is mushrooms. That said, the mushrooms that grow come in a wide variety. Some are edible, some are poisonous, some glow, some don't, some grow tall as trees, some stay tiny. Many of the smaller edible mushrooms are farmed by the people who live in the Underdark.
Type
Underground / Subterranean
Inhabiting Species
Comments