The Voidharrow

The Voidharrow is the space where a pocket dimension that is home to fiend-kind exists. It lies in the space between stars, beyond the horizon of all black holes. It does not follow the rules of this reality, it is a fragment of a relic of a bygone era. The Voidharrow contains a pocket dimension that houses a solar system of four celestial bodies that orbit a red star known as Nessus.

Background
The story goes that long ago there was one planet where all the races of the galaxy existed, and beyond this world existed a multiverse. However, when doom came to the cosmos the old gods used their power to destroy their homes and reorder the universe into only two realities, the known world and The Voidharrow.

One god was more clever than his peers, none remember his name but fiends remember him as "The Father of Lies." This clever god bent the rules of the new order and secreted away a star and its four celestial bodies into a pocket dimension deep inside The Harrow.

Kaebooros
The First and Highest realm of The Voidharrow and under the rule of Archduke Ramazall. Its landscape is a sea of red and orange sandy dunes against a dark black sky. This desert is spotted by rocky spires and pillars made out of a dark, crimson-red stone.

The city of Kaebooros is on The Blood Plains and houses the palace of Lord Saturos. It is built around a bubbling magma pit and is surrounded by 1000 ft. tall walls of dark metal. The air is dark with pollution from factories and the smokestacks that rise from the city like mighty needles stabbing the sky. Lesser devils roam the streets that flash with seedy neon signs, and shadowy souls work as slaves on construction and in factories. Lord Saturos' palace of gothic opulence sits in the center of the city on a pillar above the magma pit.