Frustrated with the editing/beta readers for not noticing Brandon leaving out a character.
The character I'm talking about is Rlain. An entire part of the book was spent with every single member of Bridge Four talking about how Rlain wasn't really a part of things, and even more so Rlain himself in his POV chapter. And then nothing! We get a conclusion to the whole buildup of Bridge Four, but Rlain is nowhere mentioned in the last half of the book. Nevermind that we've all spent an entire book (and the three years since WoR) wondering if Rlain will become a squire, and nevermind that we get an answer to whether a Parshman can become Radiant in the first place. We just get nothing! No resolution.
Everyone noticed this. I noticed it even before the beta read started. Brandon was well aware, and this was all intentional. I'll bet you can think of some reasons for it.