Thorian - Rise of Horusianism: For nearly a standard millennium the Promeans continued on their quest, combating threats to the Emperor's realm while seeking a means by which He might be brought back safely to a mortal body. The research of the Promeans rivalled the greatest libraries of the Imperium, but it was dispersed across the galaxy like pieces of a puzzle scattered over a wilderness.By the 33rd Millennium the Inquisition boasted several thousand Inquisitors and hundreds of thousands of agents, but was still little more than individual bands of dedicated men and women pursuing their own goals, with little or no organisation amongst themselves. Thus were the seeds of heresy allowed to take root once more.It is not known whether Moriana herself was still alive at this point, unnaturally sustained perhaps by the energies of the Eye of Terror, but her legacy was to make itself felt again. Over a period of several standard centuries, those Inquisitors that had once claimed to be Promeans began to pursue a new philosophy.Amongst the great number of texts compiled over the millennia by their predecessors was a growing body of information concerning musings on the nature of Horus and his possession by Chaos. Considered by many to be unholy tomes whose secrets were best left forgotten, these texts once more began to be rediscovered and entered circulation and debate.As the resurrectionists took greater note of these works, a splinter philosophy began to form, eventually to be dubbed the Horusians. Unwittingly, they were continuing the work of Moriana, investigating the possibility of using the power of Chaos to restore the Emperor to a mortal form fit for His immense psychic presence. The nature of their works took them to some of the most uncharted areas of the galaxy, in particular around the Eye of Terror, and unobserved by most they grew in numbers and influence.A few true Promeans still remained, and as they became aware of what was happening they were horrified. Only a handful had ever read the first teachings of Promeus, or had been recruited by Inquisitors that had seen his works, but they immediately recognised the hand of Moriana in the beliefs of the Horusians.Now a dwindling faction, spread across the Imperium, the few Promeans that remained did what they could to thwart the efforts of the Horusians, but there was little they could do and by the end of the 34th Millennium the Horusians were a dominant part of the Inquisitorial agenda.It was a woman named Stalia von Dressen that stood against the tide. She had been inducted into the Inquisition by a man named Lord Phoran, who had in his possession a second generation copy of Promeus' original works. This had been passed from master to apprentice for nearly two and a half thousand standard years, and the keepers of the book were all dedicated Promeans.Inheriting this mantle, von Dressen was still young and idealistic. Warned by her mentor of the threat posed by the Horusians, von Dressen made it her life's work to combat this menace and see the Horusians' power broken.Abandoning her normal Inquisitorial duties, von Dressen embarked upon a lifetime of travelling, contacting as many of her fellow Inquisitors as was possible. With the Book of Promeus as her guide, she began to recruit to her cause, particularly amongst the oldest and most respected Inquisitors, as well as creating anti-Horusian cells on the worlds that she visited.Now well-respected amongst the higher circles of the Inquisition, she met Lord Inquisitor Ardlan Baigdan. Between them, they spent two solar decades on Terra itself and using references and clues from the Book of Promeus they found some of the texts created by the original founders of the Inquisition.Though these were truly ancient and terribly incomplete, the two of them pieced together enough information to show them the original schism between the newborn Inquisition and the Promeans. Aged one hundred and twenty standard years old, von Dressen reached a harsh decision. For her entire life she had been dedicated to the Promean cause, and now had to search deep in her heart to admit that it had been a fool's errand.It is a testament to her conviction that Horusianism had to be stopped that she destroyed her copy of the Book of Promeus and, with Baigdan, initiated a pogrom of pro-resurrection Inquisitors. By the time she died, aged three hundred and four standard years, this new order was beginning to establish itself and the Horusians were embattled and dwindling.By the start of the 35th Millennium, the Inquisition had turned full circle and resurrectionism was once again all but eliminated from the Inquisition's goals.