A ter'angreal kept in the White Tower. It is used in the test for Accepted to be raised to the shawl. The Accepted must enter the oval ring, then perform one hundred weaves exactly as prescribed while be assaulted with a range of attacks and distractions.

References (Possible Spoilers)#

  1. In New Spring
    1. NS,Ch9 - Unlike the Three Arches, sisters channel at the oval ring to activate it. Moiraine enters the oval ring and begins performing the hundred weaves.
    2. NS,Ch10 - Moiraine completes the hundred weaves. Afterwards, she learns that Elaida set up the last test which was unusually cruel.
    3. NS,Ch11 - Moiraine and Siuan step through the inactive oval ring as part of the ceremony where they are raised to the shawl.
    4. NS,Ch14 - On the first day of the Feast of Lights Ellid enters the oval ring for her test but she never returns.
  2. In Towers of Midnight
    1. ToM,Ch20 - Nynaeve enters the oval ring for her test for the shawl.