Dirge of the Damned
The Shadow Plane is known as the Ebonlands. It is the native Plane of Demons and Devils, once belonging to Outer Planes these fiends came to the Ebonlands to become one with darkness. These creatures are the stuff of nightmares and commonly travel to Pariatas to steal people from their beds to use in their insane sacrifices or other dark plans. Since the Ebonlands is a Transitive Plane, travel is still possible to that plane if the correct spells were ever unearthed. There are also myths of portals that can be used to enter the Ebonlands.
This realm is also the place all wicked souls go when they pass onto the afterlife. In the Ebonlands no one demon or devil rules truly, but rather the souls of the damned are divided up between all the fiends that have the power and resources to pluck them for their collection. Fiends corrupt as many souls while they are living as they can, so that when that soul passes into the afterlife it becomes their property, and the fiends gauge their power by who owns the most property.
Souls condemned to the Ebonlands are given bodies much like they had in life, but when these bodies die they are restored to perfect condition a few moments after its demise, a perfect specimen to be tormented and ripped apart all over again and again. The pain one eperiences in these bodies is amplified due to extra sensitivity of the nervous system, and hunger and thirst are almost always a constant feeling as souls are never fed or given water. Death by starvation and thirst is a common method of torment if the demons tire of you.