Sir Robert Shuland's Horse Rib Bone

Origin
Local legend states that Sir Robert de Shuland had a terribly violent temper of which was apparent after a monk refused to obey his command. In a bout of anger he jumped off his horse and murdered the man. Afraid that his rash actions would anger the king he and his horse, Grey Dolphin, raced to the beach as the King's boat was anchored just offshore. Leaving the horse on the beach he swam to the boat and got his pardon. Returning to his horse he crossed paths with a witch who informed him that his horse, who saved his life by taking him to the King, would be the death of him. On hearing this Shuland jumped from his faithful stead's back and promptly beheaded Grey Dolphin. A year or two later while walking along the same stretch of beach Shuland he came upon the same witch again, this time she cackled at him and vanished before he could reach her. In a fit of violence he kicked out and cut his big toe, ironically on the skull of his trusty horse. A sharp piece of bone had gone through his boot and into his toe. Shuland died of blood poisoning a few days later due to his tow becoming infected and thus fulfilling the witch's curse.

Effects
Causes bouts of intense rage, if cut by bone wound will immediately turn sceptic.