Items of The One Power
Angreal are artifacts which enable their users to draw more of the One Power than they would normally be able to. Angreal also protect them from drawing enough Power to burn themselves out.
Sa'angreal are identical to angreal, except that they allow the user to draw more Power than even an angreal can handle. At least one sa'angreal, usable only by men, is known to be missing the buffer that prevents the user from drawing more than the sa'angreal allows him to safely use. This is Callandor, pronounced CAH-lahn-DOOR, the sword which is not a sword. The access keys—both ter'angreal—for the two most powerful sa'angreal ever created, the Choedan Kal, are in Rand al'Thor's possession. These allow him to tap into the vast power of the one buried in Cairhien designed for use by men and another designed for women which is buried on Tremalking (although the access key for the female Choedan Kal was destroyed cleansing saidin during the ninth book Winter's Heart. At the end of the 12th book the male Choedan Kal itself is destroyed by Rand Al'Thor turning its power against it).
Ter'angreal are objects of the One Power that perform specific functions. Some ter'angreal do not require the One Power to be used for their activation, such as the spiral ring in the form of a Möbius strip which Verin gave to Egwene (which she gave to Elayne and Nynaeve), and the twisted red doorframes that lead into the realms of the Aelfinn and Eelfinn (Snakes and Foxes).
The techniques the ancient Aes Sedai used to create angreal, sa'angreal, and ter'angreal have been long lost to the White Tower. However, by studying a foreign ter'angreal known as an a'dam, Elayne was able to devise and test a successful theory for creating ter'angreal.
The Aes Sedai consider all items of the Power to be property of the White Tower and, in general, this is not disputed. The High Lords of Tear, due to their fear of anything connected to the Power, collected a cache of items suspected to use the Power, which they hid away from the world. The Kin also collected a cache of items, one of which was the Sea Folk's Bowl of the Winds that was used to correct the weather in The Path of Daggers. However, the Aes Sedai do not know the uses for many of the objects, similar to many of the objects of Power kept in the White Tower. These objects can be dangerous to Aes Sedai testing them, sometimes burning the power from them or even killing them. Aviendha, of the Taardad Aiel may have a Talent for knowing what objects of Power can do.
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