Gleipnirs are magic-inhibiting devices placed on witches who are captured by the Inquisition. They are usually made in the shape of collars but variants are known to exist. When placed, it reads the operating procedures of a spell and depending on the amount of mana used, the Gleipnir detonates the explosives contained inside. Other Gleipnir variants are made to pacify their targets and put them in stasis.