The Emanuel Levy website seems to have posted part of the Your Highness press material. The article about casting says this about Damian’s character, Sir Boremont:
Fabious’ right-hand man (pun intended) in battle is the battle-scarred head knight Boremont, who possesses a menacing metal claw in place of the hand he lost during battle. British performer Damian Lewis was asked to come aboard and portray this tough. As Lewis explains: “I play Fabious’ best friend, Boremont. He’s a grizzled, superb warrior and will do anything for Prince Fabious.” Of his appendage, Lewis explains: “Boremont now has a metal claw encased in a housing unit across the top of the arm. This lethal, 12-inch dagger comes out and he use it as a knife.”