A Pit Thing is a powerful, quadrupedal predator that is native to Fenksworld in the Calixis Sector and may be derived from genetically-altered human stock. In the depths below the hive cities of Fenksworld, pale things writhe. Varying between two and three metres high at the shoulder, a Pit Thing is a vicious predatory beast fuelled by hate. The strong chemical reek that surrounds these creatures is often the first sign of their presence, and Fenksworld underhivers heed that warning well. Pit Things are bulky, colour-leached carnivores with four stumpy legs. Pit Things also possess webbed claws and feet, making them agile swimmers, and they seem to be resistant to the typical chemical and toxic hazards of industrial hives. Their four eyes are arranged symmetrically in a vaguely canine skull, while their mouths are circular, lamprey-like maws studded with razor-sharp teeth meant to rend and tear. They are non-sentient and seem singularly unintelligent, perhaps the only reason why the Pit Thing has not claimed the title of apex predator on Fenksworld.
The Pit Thing uses its size and strength aggressively in combat, often charging into battle with furious rage. Those unfortunate enough to fight the Pit Thing must be as wary of its acidic drool as its rending claws, as every savage bite inflicts wounds that burn through armour and flesh alike. Sump-skiffs cruise the polluted vaults below Fenksworld's hives, seeking out Pit Things to capture with gaffs, nets, hooks, and electro-poles. A handful of men never make it back from each trip, torn from the skiffs and pulled down into the burning, toxic sludge. Usually, these hunters lace a piece of meat with powerful soporifics to use as bait, a tactic that enhances the odds of each hunt's success. The Adeptus Arbites struggle to suppress these heretical hunts. However, the value of each Pit Thing makes this highly dangerous occupation extremely lucrative. Thus, every time the Arbitrators shut down one beast-hunting group, two more form from the remnants to begin operations.
Once a Pit Thing is captured, it is placed into an iron cage and delivered to the arenas to provide bloodsport for the hive city's populace. The Pale Pits of Volg Hive are the most infamous for utilising alien beasts in their gladiatorial matches, but the sheer savagery and unthinking malice of the Pit Things make them unique even in these blood–soaked environs. These terrifying beasts rampage through as many as a dozen men at a time, painting the sand red with blood only to crush the final few beneath its rubbery bulk. There are some indications that link the Pit Things to the Blight of Nova Castilia, a gene-atrocity committed by the Logician cult. Tech-heresy on a planetary scale, the Blight spread like wildfire through that hive city's population. There are whispers that during this event, several families simply went missing, replaced by pallid, raging monstrosities.
- Dark Heresy: Creatures Anathema (RPG), pg. 55