The Dead Zone

The region of the planet where the magical radiation cannot pierce through the earth. The Dead Zone is where most of the "monsters" live. Anything that can survive that long is powerful and dangerous.
  Creatures that live in the Zone generate their own magical energy, usually through demonic means. It is also home to a few types of planet life and fungi. Miners are at risk of attack from the creatures that lurk within the darkness. Most mining crews are well-armed or have a dedicated bodyguard.
  Within the Zone, psionics are the most useful because their power is generated from their mind, not from solar magic. There have long been rumors of there being something not only evil deep within the planet but intelligent. Not just a maze of mindless beasts roaming the dark, but an intelligent society pulling the strings.
  Those who have saught to find the deepest point in the Dead Zone never return.