Brimstone by Callie Hart

Duty. Blood. Honor. Power.
 Saeris Fane doesn’t want power. The very last thing she needs is her name whispered on an entire court’s lips, but now that she’s been crowned queen of the Blood Court, she’s discovering that a queen’s life is not her own. A heavy weight rests upon her shoulders. Her ward—and her brother—need her back in her homeland…but the changes that have strengthened Saeris have also made her weak. Born under blazing suns, Saeris will surely die if she makes her way home through the Quicksilver. Which means that, once again, she must send someone else in her stead…