Egwene Al'Vere. The star of the book and arguably the best 'performance' of a character in the wheel of time sage, if not on any fantasy book. She continues her fight against Elaida do Angry Retard, by continuing to take punishments, but not being broken. And trying to convince sisters, especially sitters that Elaida should get removed. She is also on a meeting to serve drinks to Elaida, when in a conversation she completely destroyes here, making Elaida use the One Power against her. Which makes the Hall give Elaida a punishment, though not remove her as Amyrlin Seat. Anyway, Saenchan finally attack and they do incredibly well. However, Egwene despite not being able to channel in some decent level because of that tea, organizes the novices and makes a good defense. She then gets a saengreal (or whatever they are called) and starts destroying them. With novices and a group of sisters, who at-least for the moment respected her authority he achieves to make them retreat. And doing so, they manage to get Elaida, who during the fight has been sleeping.
Verin
Such an amazing character. Sacrificing everything to infiltrate the Black Ajah. And boy, she does it in a wonderful way. Finding around 200 black sisters and giving the list to Egwene just before her death. And doing it on such a flashy way. Verin will be missed.
Egwene doesn't manage to catch all of them, but still a great execution takes place. Sheriam (which was a very likeable character) one of the executed.
Cadsuane the magnificient almost breaks Semirhage and would have done so if she wouldn't have been saved by Shaidar. She then (together with Elza) kidnaps Rand and orders him to kill Min. Rand gets terrified, goes batshit crazy and draws from the True Source, balefiring him. Another Forsaken gone for good. She then tries to make a deal with The Daughter of Nine Moons (who later becomes the Empress) but not good luck there. Anyway, Rand goes full mental in this book, almost kills his father, exiles Cadsuane, almost completely destroys Saenchan, before almost destroys the world. Until on the last moment, he has a relevation and instead destroys that powerful statue. On other things, he probably killed Graendal.
Mat's part is fun but not important. He gets a letter from Verin though, which likely will play a role on the next book. Perrin has a very minimal role, while Faile kills the prophet. Nynaeve now has completed the transformation to Moiraine (the version of books 4 and 5). Mentioning her, it is time for her return.
Siuan is also a character that takes a lot of development on this book, which is always good.