The Abyss is the home of demons, the very incarnations of mortal sin and vice. When a demon is created from the utter corruption of a mortal soul, that soul's sin and vice literally rips open a tear in the fabric of the Astral Plane, creating a personal hell for that demon, a place of torment that inflicts on them punishments their shattered morality believes they deserve. However, while this personal hell is torture for the demon, in their twisted state, they will also use it as a place of torment against those unlucky enough to fall into their grasps.
Each demon has a unique personal hell. One may have a sea of acid. Another may have a blazing desert where each grain of sand is searing-hot iron. Another may have a cavern where every rock is as sharp as a razor blade. And so on, and so forth. The size of a demon's personal hell depends on the demon's power. A weak imp has a hell the size of a small house, while the greatest demon princes control realms the size of entire countries.
While a demon may use their personal hell as a lair, a place to rest and recover, many also use it to torture mortals stupid enough to make a deal with them. A demon may spend months or even years torturing the poor souls before they finally break, and are transformed into a demon themselves, with their own personal hell. This hell usually forms near their former captor's lair, and is often connected to it in some way. While it is possible to find a lone hell, or a small cluster, out in the darkest reaches of the Astral, over the millenia, many demons' hells have become woven together in a great nexus the size of a continent--one of the largest astral realms known. This vast domain of spiritual decay and sin is known as the Abyss, and it is the source of more suffering and torment than any other realm known to mortal scholars.
Of course, there might be a place even worse... many legends speak of *the* Hell, the prison and personal hell of Lucifer, the fallen archangel. Fortunately, however, the Gates of Hell have never been discovered, and their existence remains little more than a tale told by fearful mortals or desperate demons. And yet, the worrying thing is that in Horror Shop 'verse, most myths have an element of truth to them. So, the question is... how many of the legends of Hall are actually true? Because if it is a hell designed to torment a demon made from the soul of an archangel, it would have to be vast, horrible and completely hellish in every way possible.