Onyx Storm (Empyrean, #3) by Rebecca Yarros

Onyx Storm (Empyrean, #3) by Rebecca Yarros-527 pages

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Xaden, Violet, and her squad continue their journey both within the confines of Basgiath War College and throughout Navarre, Poromiel, and beyond. Onyx Storm picks up right where Iron Flame left off (and it ended with a bang, for sure). 

In the aftermath of the Battle at Basgiath, Violet and Andarna are set on searching for more of Andarna's kind. This search leads them to unexpected places, including several islands off the coast of Amarylis/The Continent. 

There is more than one big reveal and the ending is a huge cliffhanger (just like the first two books).