A Shamkniv is an ogre torture device used to torture Mercadirs who fail their assignments. King Dimitar wields this weapon. It's jagged so each cut leaves a scar, and if someone seriously disappoints the king he dips it in flesh-eating bacteria. Usually, it's only used for one or two cuts for a first offense, but in Lady Gisela's case, Fintan sentenced her to many. Lady Gisela was cut in places such as her neck, face, and chin. Keefe was also threatened with this in Nightfall. In Nightfall, it is also revealed to Sophie Foster that Alvar Vacker was hurt in several places by a shamkniv.
A dagger-size weapon, short and heavy, made of black metal that curves like a crescent moon. Serrated, but "no one realizes... until it's tearing their skin."