The Abyss

The Abyss is an extra-dimensional realm beyond the reach of most humans. It is a Micro-Realm, meaning it is finite in size.
The Abyss was originally created as a barrier, between the Prime Realms and the prison realm of the ancient enemy. In order to pass from one to the other, one would have to travel through the abyss, which is not an easy task.
The Abyss appears to be an enormous pit, stretching downwards an impossible distance. At the top, it is enormously wide, and gradually tapers at it reaches the bottom. The sides of the abyss are jagged, and appear much like a cave's walls. There are also off-shoots from the main abyss, which are smaller abysses.
The interior of the Abyss is constantly shifting, features and "landmarks" changing location, making it very difficult to chart, even by the Denizen Cartographers who have visited. However, there are a few notable locations. One of these is Sarakosa, the dead city which floats above the abyss. Another notable location is the Dragon's Pit, where Livia and Velkyn were locked away for millennia.
=== Inhabitants of the Abyss ===
The souls of the wicked are often condemned by the King of the Dead to be sent to the Abyss, to spend years fighting the dark creatures which would try to break through. This is both a punishment and a duty.
Many other creatures inhabit the Abyss, sourceless terrors of unknown origin, likely created by the monsters on the other side, or corrupted souls and creatures.
The mad Dark God Shoggor dwells in the depths of the Abyss, his purpose there not entirely known.