Onyx Storm by Rebecca Yarros: is book 3 of the Empyrean series worth reading? We give you the honest verdict on plot, romance, and whether the series is still delivering.
• You've read Fourth Wing and Iron Flame and love the series
• You want the world to expand beyond the war college
• You can handle a long book with some slow patches
• You're invested in the series mythology
• You haven't read Fourth Wing and Iron Flame
• You found Iron Flame's pace frustrating
• You want closure rather than more setup
• You're a casual series reader — this rewards deep investment
Onyx Storm is the book where Yarros is clearly executing a longer plan. The military-academy setting that defined the first two books falls away — Violet and Xaden's story moves into a wider world, and the world-building that was suggested in books one and two starts to pay off.
For readers who were patient through some of Iron Flame's slower patches, Onyx Storm delivers a genuine reward. The mythology of the Empyrean world turns out to be more interesting than the academy setting suggested.
Onyx Storm is long. Over 800 pages. Yarros's instinct to expand — more characters, more geography, more mythology — creates a richer world but also a denser read. The middle third is slower than both previous books.
Whether that's a problem depends on why you're reading. If you're here for the romance and the dragon bonds, there's plenty of both. If you want plot efficiency, some patience is required.
Onyx Storm is the best book in the series so far in terms of ambition and world-building. It's also the longest and the least immediately propulsive. For established fans of the series, it's essential. For new readers: start with Fourth Wing and see if you catch the fever.
Score: 8.1/10. The series is deepening. Come prepared for a commitment.