The Manacles of Force was one of the dead king's seven weapons, used by the Others.
History
The dead king of Atlantis forged seven weapons in order to defeat his brother, Orin.[1] These weapons were buried in his tomb.
The Manacles of Force were protected by Prisoner-of-War upon their discovery by The Others.[2]
The Manacles, when clashed together, grant their possessor the ability to create a force field around his or herself which can be extended in size to protect others in the circular radius within reach. They can also emit potent shock waves blasting away whatever they are directed at with potent concussive effect.[2]