Unfleshed
From Lexicanum
The Unfleshed were a group of mutant-like creatures that existed on Medrengard, the current homeworld of the Iron Warriors.
The mutated rejects of the Daemonculaba, a system designed by the Iron Warriors to manufacture vast numbers of Chaos Space Marines, the Unfleshed were born disfigured and without skin. Failing inspection by their creators, they were flushed out through the sewer systems of a fortress upon Medrengard. However, these creatures did not always die, but sometimes survived and even thrived. Although each was unique in shape and size, the scent they carried from the Daemonculuba made them kin, and together they hunted for meat where ever it could be found on the Chaos World.
Like modern social hierarchies, the Unfleshed were led by the most powerful, a massive creature called the Lord of the Unfleshed. Their leader was concerned not only for the welfare of himself but all the Unfleshed, including the smallest and weakest of his kind. Throughout their hunts on Medrengard, they sought meat which was brought back to their pack, and shared to help the younger and weaker ones grow. However, the size of their larger members gives them incredible appetites.
A fascinating aspect is that the Unfleshed worship the Emperor of the Imperium despite their current state. Regardless of their mutated bodies, they have not forgotten the God of mankind. Whether this is a lingering childhood memory or a product of the genetic memories instilled upon them by the gene-seed is unknown.
The Unfleshed made a pact with Uriel Ventris and Pasanius, and assisted them with their assault on the fortress of Honsou on Medrengard. With the pair of Ultramarines, the Unflesh escaped the planet.1 However, the Unfleshed were killed on Salinas after a near daemonic infestation took place, a mercy execution inflicted by their former ally.2 Because of the destruction of the Daemonculaba, it is likely that the Unfleshed are now extinct.
