Just got around to finishing "The Chosen One" last night.
Well done Mark. Great ending - you just can't beat a big stormy light display at the end (I got what I was hoping for

)
Have to admit though, it wasn't the best in the series - "Trail of the Huntress" was a superb story with a great twist, and I found it hard to put down "First Sword" (the build up to the end fight was superb). Whilst "The Chosen One" had some great moments (the central battle), it didn't work as much magic on me as the other two.
Like Rune, I would have liked to have seen Selkor developed a little more too. "Forging of the Sword" did some good work there, but you really needed more of the same in this one.
In hindsight would you have considered expanding it to more books than 4?
Actually, come to think of it, 4 is an unusual number - was that always the intent?