My first was Pages of Pain.
I greatly admire Troy Denning's imagination and his ability to bring well known characters to life, up and out of the flat, written page where we're used to seeing them. Case-in-point: The lore is that Cyric created the Cyrinishad, a powerful tome enchanted to make anyone reading it believe that Cyric is the center of the Universe... and then he read it himself. In a manner and with such color that makes me envious as a long time DM, Denning shows what that would really mean. What it would be like for a mortal to interact with such a being, how the other gods would react to him, what kind of people would actually worship such a deity, and so on. It is always creative, and Cyric is often hilariously egocentric.
I might also add that the Kindle version I read was narrated masterfully by Nicole Greevy, who I had never heard of, but I extremely enjoyed the way she spoke incredibly precisely, you could hear every letter in every word as if she were a highly trained orator. She also put a perfect "nervous edge" on Cyric's voice, making him really come through as someone you really wouldn't want even standing next to you. Not that there was any similarity, but the effect is similar to Heath Ledger's take on The Joker: without overdoing it, she communicates that there is something just not quite right about Cyric. Oh, and he's a being of near limitless power that even the other gods admit to fearing.
After listening to Crucible, I am more convinced that Troy Denning is my favorite fantasy author.
Edit: Having listened to the other books now, it should probably be said it is relatively important to do experience the story in order. I did not, and I now know that, for example, I totally missed an important point at the end of Cyric's trial, and cheated myself out of the full emotional impact of a certain event. Now that I'm aware of previous events, I appreciate much more how Cyric is truly evil and he plays a long game in top of that. Denning is even better than I previously thought.