Twisted redstone doorframe
From A Wheel of Time Wiki
The twisted redstone doorframes are a pair of ter'angreal with similar appearances and purposes; they link to the realms of the Aelfinn and the Eelfinn, extraordinary creatures with the ability to grant wishes and answer questions. However each person can only enter each of the doorframes once; further attempts simply cause them to pass through the open doorway normally.
The doorframe leading to the Aelfinn has a series of wavy lines running around the frame; the one leading to the Eelfinn has triangles on it.
[edit] Destruction
One of them [1] was destroyed in the battle on the docks of Cairhien, when Moiraine Damodred knocked Lanfear and herself through the doorframe, while both were channeling.
