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Onyx Storm is a 2025 novel by Rebecca Yarros. It is the third book in the Empyrean series, which blends fantasy and romance elements, a genre often called \"romantasy.\" The series follows recruits at a military school in a world inhabited by dragons. Onyx Storm achieved significant commercial success, selling over 2.7 million copies in its first week and becoming the fastest-selling adult fiction novel in 20 years.123

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