Despite the overall quality of the War of the Spark book, Teyo was still a great character. It was neat to have a guy who was a pretty bad mage on his home plane end up in a conflict way over his head where his abilities are actually vital to both his and others survival. And the fact that he basically levels up his skills so much because he's carrying people's lives on his shoulders was a great way of seeing his dedication.
~~I just really don't like that they made him date Rat, the most annoying character~~