Grey Knights - Specialist Ranks: Grey Knights Apothecary - Few battle-brothers are as important to the Chapter's future as an Apothecary. It is his task to tend to fallen battle-brothers, healing them with his Narthecium, or reclaiming the Progenoid organs -- and the precious gene-seed within -- with his Reductor should the wounds be too severe. Without Apothecaries, the Grey Knights' genetic heritage would be lost amid the ruin of battle, and the Chapter would cease to exist within a matter of solar decades. Thus do the Apothecaries receive the foremost guardians the Chapter can provide. On those occasions in which one of the Grey Knights' Apothecaries takes to the battlefield, his protection will be given over to a squad of Paladins.Castellan Champion - The Order of the Purifiers as a whole is led by a Grey Knight who holds the rank of Castellan Champion and the title of "castellan." The Castellan Champion also functions as the Brotherhood Champion of the order in addition to leading its operations. The Castellan Champion carries out one of the most arduous tasks in the Chapter, acting as the Warden of the Blade -- the keeper of the dreaded Blade of Antwyr.Grey Knights Brotherhood Champion - A specialist rank, a Brotherhood Champion holds foremost responsibility for the martial training of new recruits, but on the battlefield, his chief duty is to act as bodyguard to his brother-captain. This deadly warrior has forsaken all other forms of combat to become a master of the sword. They will willingly sacrifice themselves if necessary, but this ultimate sacrifice is rare, however, as few foes are skilled enough to defeat a Grey Knight Champion in combat.Grey Knights Chaplain - Grey Knights Chaplains fulfill the same function as Chaplains in other Space Marine Chapters, albeit on a much higher level, administering to the spiritual needs of the Chapter's battle-brothers whom must face and fight the horrors of the Warp. These individuals are rare indeed as the Chapter has precious few of them. Yet, thanks to their vigilance in their duties, not one Grey Knight has fallen to Chaos.Grey Knights Librarian - Chapter Librarians are Grey Knights who have proven to possess a strength of mind far greater than that of their fellows and are able to wield their psychic abilities freely. These formidable Librarians possess a will of iron. They must, for the abilities they wield are far more powerful than those of their battle-brothers. They are privy to secrets that even the rest of the Chapter is unaware of -- secrets that they are never to divulge.Grey Knights Prognosticar - A Prognosticar or Prognosticator is a powerful, highly specialised Astartes psyker who serves within the Grey Knights Chapter and who is particularly sensitive to fluctuations in the Immaterium. The Prognosticars read psychic tremors to predict the location and severity of forthcoming Daemonic incursions into realspace. Based on the information they are able to gather from tremors within the Warp, they can usually predict a Daemonic incursion before it happens.Grey Knights Techmarine - Techmarines are warrior-smiths of the highest calibre, responsible for the creation and repair of all the equipment, vehicles and wargear employed by the Grey Knights. Techmarines are forever apart from their battle-brothers, for long standard years of training on Mars inculcate an entirely new set of traditions and rituals upon them. Many of these traditions and rituals stand in direct contradiction to the aims and goals of the Chapter. So it is that a Techmarine is called upon to balance these two opposed sides of his nature on a daily basis: to serve the goals and ideals of his Chapter, but according to the traditions and beliefs of the Adeptus Mechanicus.