A length of heavy, wrought-iron chain, having belonged to the infamous Grand Inquisitor and imbued with all of the hate and pain caused by the Spanish Inquisition. It was part of the rack which he used to torture people. It's been on the Warehouse's most wanted list for a while.
In 1483, Tomas de Torquemada was promoted by the Spanish Catholic church to the new office of Grand High Inquisitor of the Inquisition. The Inquisition was created by the church with the intent of uncovering and converting 'heretics' (non-Catholics) by subjecting them to horrific torture if they refused to convert. Torquemada was so zealous in his efforts as High Inquisitor that even other Catholics grew to despise him.
By grasping the ends of the chain in both hands, tugging the ends apart, and focusing on a victim with one's will, the chain can inflict the same effects of a Spanish Inquisition torture rack. The joints of the skeleton are painfully dislocated in every conceivable direction, and the victim dies of massive internal trauma shortly thereafter. Prolonged use makes the user into a soulless killer as it robs them of a fraction of their humanity with each use.
During the Spanish Inquistion, methods of torture were in fact used, but in a very limited number of cases; scholars estimate only about two percent of cases, and only fifteen minutes at a time. In less than one percent of the time, torture was used a second time, but no more than that. Of the methods used, the potro (rack) was used most often. The victim was tied by the wrists and ankles with leather or metal cuffs, which attached to ropes or chains wound around large spools at either end of a table. During an interrogation, these spools could be tightened in a step-wise fashion, increasing the tension on the ropes/chain. As they tightened, it pulled the arms and legs in opposite directions, putting severe stress on the skeleton and subjecting the victim to intense pain and bodily trauma. Even if the victim were to survive the dislocation of their joints, the connecting muscles would have been severely torn, and thus rendered weak and useless.