A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Vora's Sa'angreal (TGS, Ch. 40) is one of the few sa'angreal the White Tower possesses and perhaps the most powerful, is in the shape of a white fluted wand, the length of a woman's forearm, made of an unknown material that resembles bone and ivory. It is kept in a plain polished wooden box (TDR, Ch. 18). It was used by the circle that healed Mat (TDR, Ch. 18) and by Egwene and her circle when they fought off the Seanchan (TGS, Ch. 40). It was used in the Last Battle by Egwene, firstly to fight Trollocs in Kandor (AMoL, Ch. 13), and again when the Sharans first appear (AMoL, Ch. 20), though she doesn't use it after they arrive, for fear of detection. After Gawyn is killed, Egwene takes Vora's Sa'angreal from Silviana and uses it when leads a group of Asha'man and aes Sedai to attack the Sharans (AMoL, Ch. 37). When Taim uses Sakarnen to weave balefire, Egwene uses Vora's Sa'angreal to weave a counter, which she names the Flame of Tar Valon, cancelling it out and fixing much of the damage it did (AMoL, Ch. 37). She draws in more power than is safe, as the sa'angreal didn't have a buffer to prevent a woman drawing in more than is safe (AMoL, Ch. 37). After this, Leane finds it in the center of a fifty foot high column of crystal (AMoL, Ch. 37).