A ter'angreal in the form of a black rod a pace long and so flexible it can be bent into a circle and spring back. It causes pain. The degree of pain can be controlled so that one blow can feel like one, or a hundred.

References (Possible Spoilers)#

  1. In The Path of Daggers
    1. TPoD,Ch2 - Elayne finds the flexible black rod while going through the Ebou Dari stash. Nynaeve says it feels like pain.
  2. In Knife of Dreams
    1. KoD,Ch15 - Aviendha reads the flexible black rod to determine its use.