Another great book by Brandon Sanderson! This book reveals a lot more about Epics, the "magic" system, and how things here are related to Brandon's Cosmos (I'm pretty sure this trilogy is related, but correct me if I remembered wrong haha).
We learn a lot more about Firefight and Prof in this book with more insight on their characters, values, and histories. Lots of action will keep you reading right till the end.
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Firefight