A powerful ter'angreal. When emplanted in Tel'aran'rhiod, it creates a zone encased in a violet shield. In the dream world it prevents one from entering or leaving the zone by will. In the real world it prevents Traveling and Skimming.

References (Possible Spoilers)#

  1. In Towers of Midnight
    1. ToM,Ch2 - Moridin has two dreamspikes. He loans one to Graendal to use against Perrin. He already has the other one in use.
    2. ToM,Ch18 - In the wolf dream, Perrin and Hopper find a translucent violet wall. It suddenly vanishes.
    3. ToM,Ch26 - Perrin and Perrin report to Perrin that Traveling is not working.
    4. ToM,Ch28 - Slayer kills several wolves when they are trapped inside the violet dome.
    5. ToM,Ch30 - The violet dome still covers the Jehannah Road.
    6. ToM,Ch35 - Perrin finds the dreamspike in the wolf dream and heads north with it.
    7. ToM,Ch36 - Perrin flees from Slayer and takes the dreamspike to Tar Valon.
    8. ToM,Ch37 - The dreamspike traps the Egwene and her companions as well as Mesaana and the Black Ajah.
    9. ToM,Ch38 - Perrin throws the dreamspike into a nightmare pit of lava destroying it.
    10. ToM,Ch51 - Rand determines that he cannot Travel to the Black Tower.
    11. ToM,Ch53 - Pevara Tazanovni tries to leave the Black Tower by Traveling but her weave fails.
    12. ToM,Ch56 - Androl Genhald attempts to work a gateway but it repeatedly fails. He seeks out Pevara Tazanovni.