Corwin's brother Benedict is introduced in "The Guns of Avalon" as having lost his right arm in battle with the same dark forces menacing all of Shadow. In "Sign of the Unicorn" Corwin encounters Benedict's ghost in Tir na Nog'th. The ghost is wearing a remarkable prosthetic metal arm that can reach through unreality and attack him, even as Grayswandir can reach Benedict's ghost. Corwin strikes the arm from the ghost and returns to Amber with it. Later it is given to Benedict by Random, who performs the surgery to attach it. In the next novel this proves invaluable as the arm can overcome Brand's magic, allowing Benedict to strangle him despite being paralyzed, forcing Brand to vanish leaving the Jewel of Judgement behind. In "The Courts of Chaos" the arm is returned whence it came in a ghostly re-enactment of Corwin's fight with Benedict's ghost, occurring in the halls of Amber itself. These events are suspected to be caused by Oberon himself.