Warhammer 40,000 - Grey Knights - Codex 8th

Chanting rites of banishment, the elite brotherhoods of the Grey Knights stride fearlessly into battle against the worst horrors of the galaxy. They wear blessed silver battle-plate and wield potent weapons of purgation, each a master-wrought relic whose worth can be measured in worlds. Every battle-brother of this Chapter is a powerful psyker, his will an adamant fortress and his mental powers a honed blade. As the galaxy becomes ever darker, the selflessly heroic Grey Knights fight unbowed.

Codex: Grey Knights contains a wealth of background and rules – the definitive book for Grey Knights collectors