Underdark

A vast region of underground caverns and tunnels miles beneath the surface of the planet, home to a great array of beings and whole cities and kingdoms of creatures like Drow, ahu-nixta, myconids, ratfolk, undead, norkers, and illithid. Conditions vary, but for the most part, the Underdark is cold, dark, wet, and silent, covered in molds, fungi, and luminous plants.

Sages commonly divide the subterranean regions of Jesenreth into these sections:

The Upperdark, starting around 500 feet beneath the surface, down to one mile. Ratfolk and norkers are the major powers here, with outposts and raiding parties from the lower regions.