Iron Warriors - Medrengard: When Honsou returned to the Iron Warriors' homeworld of Medrengard within the nightmarish realm of the Eye of Terror, he sent the newly obtained gene-seed to the Forces of Chaos' Warmaster Abaddon the Despoiler as was required, but he secretly kept a small portion of the pure genetic material for himself. With his ill-gotten gains, Honsou set about constructing an unusual genetic system known as the Daemonculaba -- which combined the application of technology and the arcane to create new Astartes to swell the ranks of the Iron Warriors.This process required an adolescent human boy to be sealed within the womb of a genetically-modified human female slave, known as a Daemonculaba, who had been impregnated with the stolen Astartes gene-seed. The Daemonculabas either produced horribly mutated freaks known as the Unfleshed (who were cast out into the wastelands of Medrengard) or a new Chaos-corrupted Astartes ripe for incorporation within the Iron Warriors' ranks. The Daemonculaba hosts were kept within Warsmith Honsou's fortress of Khalan-Ghol.Refusing to uphold his predecessor's promise to share the stolen gene-seed amongst his fellow Iron Warriors commanders, Honsou led his warriors in a brutal civil war with two rival Warsmiths -- Lord Toramino and the Chaos Dreadnought Berossus. Recently exiled from the Ultramarines Chapter for violating the Codex Astartes, Captain Uriel Ventris and his best friend, the Veteran Sergeant Pasanius Lysane, were tasked to fulfill a Death Oath sworn by their Chapter Master Marneus Calgar. They accomplished this by traveling aboard the ancient Daemon Engine Omphalos Daemonium into the Eye of Terror and infiltrating Medrengard. Once there, they were tasked with the impossible mission of seeking out and destroying the Daemonculaba.Engulfed by the Iron Warriors' civil war, Khalan-Ghol was under siege by the Warsmiths Toramino and Berossus. The Ultramarines enlisted the help of the Raven Guard Renegade Ardaric Vaanes and his group of fellow Space Marine Renegades, infiltrating the fortress at the height of the siege. However, the group was soon captured by Honsou's daemon-possessed Iron Warrior bodyguard, Onyx, and taken to the halls of the Savage Morticians, Dark Mechanicus Tech-priests that had created and oversaw the Daemonculaba process.Once there, Uriel was entombed inside the womb of one of the Daemonculaba. Honsou showed great interest in Pasanius' bionic arm of living metal, which was made from Necrodermis, the living metal that comprised the cybernetic bodies of the Necrons and their C'tan Shards. Pasanius' bionic arm was removed and reattached to Honsou for him to use. This enraged Pasanius against the Savage Morticians who had performed the surgery, even as Uriel miraculously fought free of the Chaos-corrupted womb and made good his escape, along with a few survivors, down a sewage chute.In the meantime, making one final push against Khalan Gol, the forces of Berossus stormed Honsou's citadel. The two rival Warsmiths fought a titanic duel, but with the help of his daemon-possessed bodyguard, Honsou eventually emerged triumphant. With the death of their lord, Berossus' men defected to the forces of the victorious Honsou, and joined his forces against the rival Toramino.Leading a band of the mutant Unfleshed, Uriel once again infiltrated Honsou's citadel and successfully destroyed the Daemonculaba. Uriel also freed the Heart of Blood, one of the most favoured daemonic avatars of the Blood God Khorne, which had been imprisoned by the Iron Warriors and forced to create and sustain an unbreakable psychic barrier around the fortress of Khalan-Ghol for over ten thousand Terran years. With the psychic barriers broken, the Chaos Dreadnought Warsmith Toramino was able to employ psychic attacks against his rival's citadel.During the ensuing melee, Honsou and his retinue discovered and cornered both Uriel and Pasanius before they could flee the citadel. But before the Warsmith could have his retinue slay the upstart Ultramarines, the Unfleshed arrived on the scene and viciously attacked the Iron Warriors and slew them. Fleeing from the battle, Captain Ventris caught up to Honsou and shot him in the head with his Bolter.Having fulfilled their Death Oath, the two Ultramarines returned to their Chapter on Macragge. After their departure, by some dark miracle, Honsou managed to survive the near-fatal wound. The wounded Warsmith then discovered the Heart of Blood, thoroughly exhausted from its battle with a daemonic rival, and collapsed upon the floor of the ruined citadel.Employing the formidable powers of the Heart of Blood against Toramino's attacking forces, Honsou eventually emerged triumphant. The slaughter and destruction the daemon had unleashed was unlike anything the Warsmith had ever seen before, its ancient fury deeper than the darkest chasm in the Daemon Primarch Perturabo's lair. It had reduced everything before it to utter ruin and Medrengard's blazing black sun had gorged on the souls released into the dead sky.