A Conjuring of Light

I liked this one the least of the (currently) 4 books in the series, mainly because the first 1/2 felt like it dragged on quite a lot and I didn't love the arc of having Osaron show up at the beginning then basically do nothing for a while as the main characters set up their plan to defeat it. But overall it's still really good, with exciting action and interesting characters (Holland being the best).