Ulkair - Great Unclean One
Ulkair is an incredibly powerful Great Unclean One, a Greater Daemon of the Plague God Nurgle.
History
The Greater Daemon known as Ulkair has been a blight upon mankind since ancient times. Over 1,000 years before the current age in M40, the Imperial world of Aurelia, located in the Aurelian sub-sector of the Korianis Sector, was engulfed in a prodigious warp storm. The resulting turbulence pushed the planet out of its natural orbit causing the world's environment to plunge into an unnatural ice age. The world became entirely engulfed in ice as the temperatures plummeted, turning Aurelia into a frozen wasteland. Much of its population had died as a result of the sudden frigid environmental changes. Azariah Kyras was a Librarian of the Blood Ravens Space Marines Chapter serving alongside his master Moriah, the Chief Librarian of the Blood Ravens. When Ulkair manifested on the doomed planet he was confronted by Moriah, who managed to wound the Greater Daemon before dying from his own mortal wounds. Moriah's successor Kyras, proved luckier and managed to defeat Ulkair, imprisoning the immensely powerful daemon on the frozen planet. Then the Warp took the world and Azariah Kyras along with it. Ulkair remained trapped within his prison for over 1,000 years until the invasion of the Black Legion Chaos Space Marines invaded Subsector Aurelia. Led by their thrice-damned leader Chaos Lord Eliphas the Inheritor. The Black Legion was intent on releasing Ulkair the Great Unclean One from his imprisonment upon the subsector.
A thousand years passed, and the 5th Company of the Blood Ravens Chapter found themselves tasked with the dangerous mission of exploring and clearing an infested Space Hulk known as the Judgment of Carrion. The 5th Company took serious losses from the groups of Tyranids and daemons that infested a space hulk. Azariah Kyras suddenly appeared amidst his fellow Blood Ravens on the Hulk and used his psychic abilities to aid Apothecary Galan, the remaining ranking officer in the company, in defending the surviving Battle-Brothers from the Hulk's hideous inhabitants. The remains of the 5th Company, despite Kyras' aid, were still trapped on the Space Hulk, unable to get back to their Thunderhawk gunships and escape.
At the same time, Galan found himself haunted by a malignant daemonic presence that Kyras identified as Ulkair, the Greater Daemon that the Blood Ravens had suffered terrible losses imprisoning, and which had caused Kyras to be lost in the Warp for centuries. Unbeknownst to his battle-brothers, Kyras had been corrupted by Chaos during his long imprisonment in the Warp with the Greater Daemon. He sought to corrupt his fellow battle-brothers by enhancing their despair and playing on their fears. To gain the escape of the remains of the 5th Company from the Judgment of Carrion, Kyras entered into a pact with Ulkair in which in return for the Blood Ravens' escape from the Space Hulk, Galan was possessed by a daemon. When the 5th Company escaped, both Kyras and Galan were hailed as heroes of the Chapter and Kyras was welcomed back into the fold as a lost Battle-Brother.
Ulkair is confronted by the Blood Ravens Chapter
As the Black Legion invaded Subsector Aurelia, Eliphas and his minions captured several Space Marines and then sacrificed them, in order to free Ulkair form his infernal prison. The arcane ritual used to invoke Ulkair from his imprisonment, freed the Greater Daemon, enabling his spirit to manifest within the deceased ridden body of a Plague Marine. Once Ulkair successfully freed himself from his imprisonment the world of Aurelia was torn asunder. In the meantime, a Blood Ravens strike force led by Force Commander Aramus were tasked with the difficult mission of defeating the Daemon Lord before it freed himself.
Aramus formed an alliance with Captain Gabriel Angelos and his men in order to successfully achieve their objectives. But first the Blood Ravens had to fight the vile Chaos Lord and his minions. They clashed upon the world of Aurelia at the ruins of Keep Selenon. It was there that Arumus fought the Inheritor in single combat. Eliphas exhibited tremendous powers and unmatched savagery against the hated servants of the 'Corpse Emperor'. The favor of the wretched Chaos Lord was such, that he was able to call upon the personal blessings of all the Chaos Gods themselves to aid him in battle. Despite his formidable might, the Blood Ravens overcame the Eliphas, but before he could be slain he escaped their wrath. After Force Commander Aramus manages to fight his way through the Forces of Chaos, he eventually confronts the Great Unclean One itself. After a long and hard fought battle, Ulkair was once again defeated and imprisoned, but remarked that his prison was inadequate and weakened, and that he would soon rise again to utterly destroy the Blood Ravens.