I enjoyed reading Prophecy, but when I was done I realized that I couldn't remember what happened. After reading it a second time, it still really made no sense. The Keldons went on a silly berserk rampage (that's what Keldons do best
), the Avatars didn't show up, the black card in the Prophecy set have practically no development here (did Shauku have something to do with all this? I couldn't tell you, but she apparently has an Agent who's Revelling or some such thing), Rayne died, Barrin went ballistic on Greel (also someone I have no idea where he came from or why), and then it just kind of stopped.
Some Jamuraan prisoner was apparently the focus, but I have no idea why as he didn't do too many interesting things.
In conclusion, Prophecy was a guide to the culture and daily life of the Keldons. That's apparently the focus of the bulk of the book.