Membership among the Purifiers is not granted through the ordinary chain of command but earned through demonstrated purity of spirit, a quality tested and retested throughout a warrior's service. Those chosen leave their Brotherhood of origin to join a fellowship set apart, bound by even stricter vows of self-denial and answering to their own Brother-Captain.
The Purifiers are entrusted with duties too perilous for others, wielding sacred incinerators whose flames are said to scour taint from the very fabric of reality. Their psychic gifts lend a particular ferocity to their cleansing, and when a shrine has been defiled or a world stands on the brink of damnation, it is often the Purifiers who are sent to restore it or to see it purged entirely.
A shadow hangs over the order, for its very existence is bound to a relic of terrible power and terrible danger, guarded by one who may never wield the blades his brothers carry. The Purifiers embody both the Chapter's highest aspiration and the ever-present cost of its unending war.
Grey Knights
Order of battle
The The Purifiers field the units of the Grey Knights — a detachment from the roster:
Kindred formations
Other Grey Knights formations
Brotherhood of the FistAmong the eight Brotherhoods, that known as the Fist is spoken of as a hammer held ready to fall. Its warriors specialise in the shattering assault, the decisive blow delivered without warning into the heart of the enemy. When a daemonic incursion must be broken swiftly before it can spread, the Fist is often the answer, its Terminators teleporting into the fray to crush the foe beneath overwhelming force.
Brotherhood of the FlameThe Brotherhood of the Flame carries the light of purity into the darkest places of the galaxy. Its warriors are noted for their zeal and their mastery of cleansing fire, both the literal flame of the incinerator and the searing psychic radiance of their disciplined minds. Where corruption has taken root and must be burned away utterly, the Flame answers, leaving nothing behind that the enemy might use.
Brotherhood of the SwordThe Brotherhood of the Sword is regarded as the exemplar of the Chapter's martial artistry, its warriors masters of the force blade and the disciplined psychic strike. Balanced in all things, it can fight as readily at range as in the press of close combat, and its champions are counted among the finest swordsmen the Imperium has ever fielded. It stands as the model against which the other Brotherhoods measure themselves.
The RapiersThe Sixth Brotherhood of the Grey Knights, masters of the surgical strike and the deadliest of small-scale wars.
The WardmakersThe Third Brotherhood of the Grey Knights, keepers of ancient wards and cradle of the Chapter's greatest heroes.