A Grey Knight is the ultimate expression of incorruptible martial prowess. Unlike a standard Space Marine, a Grey Knight is a powerful psyker, a scholar of the arcane, and a soul scrubbed of all individual desire to serve as the Emperor’s ultimate weapon against the Daemonic.

As a Battle-Brother, he is a literal silver-clad saint who is utterly devoted, intensely protective, and probably a bit socially stunted because he spent his entire life training to fight literal nightmares in the Warp.