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'''Purifiers''' are members of the [[Grey Knights]] [[Chapter]] and is a position held by the most noblest of their rank. who stood watch at the [[Chamber of Purity]] on [[Titan (Moon)|Titan]].^1-p9 {{Fn|1a}}

They serve as the spiritual heart of this faction of [[Space Marine]]s and are an anathema to [[Warp]]spawn with the dark taint of these creatures withering at the touch of a Purifier. Their nature meant that they formed their own small yet entirely unique Brotherhood.^1-p12 {{Fn|1b}} This order is set apart from their Battle-Brothers due to their nature and tradition as they serve as exemplars of their Chapter's warrior ideals along with their sanctity of purpose. Their eyes burn with a black fire bordering on fanaticism whilst showing a dour and taciturn attitude. Their untarnished spirit serves as both their most defining trait and ultimate weapon which combines with their [[Psyker|psychic]] might to create a burning flame that not only surrounds their body but their soul itself. Every being which harbour evil or malevolence fuels this fire that leaves none unscathed except the Purifier themselves.^1-p31{{Fn|1c}}

Membership into their number is given to those that show a tally of grim deeds soaked in blood, valor and skill with no set procedure or training regime for entering their ranks. In fact, a Grey Knight can serve the Chapter for centuries with distinction without ever being granted the honour of membership into the Brotherhood of Purifiers. The Purifiers themselves only select those Battle-Brothers who show an incorruptible soul and who demonstrate resistance to the temptations of the Warp even amongst the standards of the Grey Knights. This high standard meant that there are only a few Purifiers with no thought ever being given on relaxing the restrictions enforced in fear that it would compromise the sanctity of their order.^1-p31 {{Fn|1c}} At any given moment, there are rarely no more than forty Purifiers and only the arrival of some great incursion does their ranks swell in number.^1-p12 {{Fn|1b}} Fortunately, even their limited numbers proves adequate to the task and they often ensure their sacred duty of combating the machinations of [[Daemon]]s thus allowing the fires of victory to endure. This duty means that they often form the spearhead of any assault though as is the case with all Grey Knights, they understand that their mission comes first before personal survival.^1-p31{{Fn|1c}}

At their station in the Chamber of Purity, they stand guard and prevent any outsiders from entering the area with only a few given the privelege of passage into this part of the citadel. It is said that only the Purifiers know the exact nature of their prisoner but never speak of it, not even to the Supreme Grand Master. Whenever the rocks of Titan shake, the Purifiers move in to seal any breaches to the chamber with the Chapter waiting in anticipation until the tremors cease. ^1-p9 {{Fn|1a}} It is known that they struck against their own Battle-Brothers who dared enter into the Chamber of Purity as they trusted no one with their sacred mission of protecting the mysterious contents of the prison.^1-p31{{Fn|1c}}

In the year 800.M41, the predictions of the [[Prognosticar]]s led to [[Grey Knights Brother-Captain|Brother-Captain]] [[Pelenas]] taking as many Purifiers with him to the [[Eldar]] [[Craftworld]] of [[Malan'tai]] that had fallen to the swarm of the [[Tyranid]]s and its ruined carcass being fed on by the [[Keeper of Secrets]] [[N'Kari]]. A dozen of their number fall before the [[Greater Daemon]]'s power before Pelenas manages to defeat it and force it back into the Warp whereupon a small number of Purifiers stand watch over Malan'tai until the Eldar come to claim the fallen [[Spirit stone]]s.^1-p12{{Fn|1b}}

*¹: [[Codex: Grey Knights (5th Edition)]], pg. **{{Endn|1a}}: Pg 9, **{{Endn|1b}}: Pg 12, **{{Endn|1c}}: Pg 31