This area is sometimes considered the 'central' area of the underworld. It's where most of the people who don't consider themselves part of any particular civilization live. Scattered in small towns across a wide variety of caverns and environments. Wild magic is more common here and storms of magic regularly rage through the area. Non-food farms are a common sight. From giant spider ranches that produce fine silk to farms that harvest blood and venom from magically corrupted giant lizards.