The Shackle is a black metal torc (open-ended ring) that restrains a Gifted’s power, and it is a symbol of distrust and enforced obedience. The instrument literally imprisons the wearer’s arm in an “ice-cold” sheath of metal. Even though the Gifted are already bound to the oaths when their Mark appears, the metal device is a redundant tool of repression that prevents them from wielding any form of magic. Unlike the Tenets, which allow certain uses of Essence, the Shackle strips the Gifted of all power, creating a temporary state that is little different than that of the disempowered Shadows who are permanently stripped of Essence and marked by veins. The Shackle renders the Gifted utterly defenseless.

The Shackle is both a physical and psychological tool to reinforce the Gifted’s status as an underclass. Shackles function like handcuffs on Essence, and the Gifted must willingly submit to these controls. The instrument is a reminder that the Administration can render them powerless at any time. Although the Shackle primarily symbolizes the repressive Tenets and the prejudices of the people and rulers of Andarra, these tools are also used among the Gifted and their allies when they cannot trust each other. Taeris uses the Shackle on Davian, Wirr, and Caeden when they are first captured, and Karaliene uses one on Caeden. When Caeden’s Shackle is first removed, “[h]e suddenly felt lighter, more energetic. Free” (299), and this scene makes it clear that the Shackle’s function as a tool of subjugation.