Iron Flame vs Fourth Wing: How the Sequel Compares
Fourth Wing and Iron Flame are the first two Empyrean books by Rebecca Yarros. Here's how they differ, what each does best, and the order to read them.
By Elena Marsh
Rebecca Yarros’s Empyrean series became a romantasy phenomenon, and new readers often ask how its first two books compare: Fourth Wing (2023) and its sequel Iron Flame (2023). Unlike most comparisons, these are not rivals but consecutive chapters of one story — so the real questions are which is better, what changes between them, and (for the few who ask) the order to read them. Here is how they stack up.
How They Stack Up
| Fourth Wing | Iron Flame | |
|---|---|---|
| Series position | Book 1 | Book 2 |
| Published | 2023 | 2023 |
| Focus | Surviving the war college and falling in love | Deeper war, politics, and betrayal |
| Pace | Tight and addictive | Bigger, with a slower middle |
| Romance | Central, slow-burn | Strained and tested |
| Read first? | Yes — required | Second |
Inside Fourth Wing
Fourth Wing drops Violet Sorrengail — physically fragile but fiercely clever — into Basgiath War College, where cadets must bond with dragons or die trying, and where the brooding Xaden Riorson is both her greatest threat and her greatest temptation. Combining a brutal, high-stakes survival story with an addictive enemies-to-lovers romance and a world of dragons and signets, it became an overnight sensation. Its tight pacing, irresistible setup, and BookTok-ready chemistry make it one of the most devoured fantasy debuts in years.
What Happens in Iron Flame
Iron Flame picks up immediately after Fourth Wing’s revelations, as Violet faces a harsher second year, a fractured relationship, and the widening war and political conspiracy that the first book only hinted at. Bigger and darker than its predecessor, it expands the world-building, deepens the politics, and tests the central romance under real pressure. The stakes escalate dramatically, and the explosive ending sets up the rest of the series — though the journey there includes a slower middle stretch that divided readers.
What Separates Them
The most obvious difference is pace. Fourth Wing is tight and propulsive, hurtling from one trial to the next. Iron Flame is larger and more complex, with a slower middle section that trades momentum for world-building and political setup. One is a sprint; the other is a longer, more demanding climb.
A second difference is the romance. In Fourth Wing, the Violet-and-Xaden relationship is a slow-burn delight building toward its payoff. In Iron Flame, that relationship is strained and tested by secrets and mistrust, giving the sequel more conflict but less of the giddy chemistry that hooked readers first time around.
The third is scope. Fourth Wing stays largely within the war college and its immediate dangers. Iron Flame opens the world up — more of the war, the politics, and the larger conspiracy — trading intimacy for ambition as the series grows.
Which to Pick First
Read Fourth Wing first — this is non-negotiable. Iron Flame is a direct sequel that begins moments after the first book’s cliffhanger and assumes you know everything that happened. Reading it first would spoil Fourth Wing’s biggest twists and leave you completely disoriented.
Once you have finished Fourth Wing, move straight to Iron Flame if you are invested — and after that explosive first book, most readers are. Just go in knowing the sequel is a bigger, slower-building, more emotionally turbulent ride.
A Note on the Middle-Book Slump
It is worth setting expectations: many readers found Iron Flame’s middle slower than Fourth Wing’s relentless pace, a common feature of second books that have to widen a world and move pieces into place. If you hit that stretch and feel the momentum dip, push on — the back third and the ending are widely agreed to be where the sequel earns its place, and they set up the rest of the series with real force. Knowing the shape of the book in advance helps you ride out the slower middle and reach the payoff.
After These Two
Once you have read both, continue with the rest of the series using our Fourth Wing books in order guide. For more in the same vein, our authors like Sarah J. Maas guide and our ACOTAR vs Fourth Wing comparison point to the wider romantasy world, along with our best romantasy books roundup.
So where to land? Read Fourth Wing first — it is required — then Iron Flame for the bigger, darker continuation, and together they launch one of the most addictive romantasy series of the decade.
Frequently Asked Questions
Should I read Fourth Wing or Iron Flame first?
Read Fourth Wing first — always. Iron Flame is the direct sequel and the second book in the Empyrean series, picking up immediately where Fourth Wing ends. Reading Iron Flame first would spoil Fourth Wing's major twists and leave you lost, since it assumes full knowledge of the first book's world, characters, and revelations.
Which is better, Fourth Wing or Iron Flame?
Most readers rate Fourth Wing slightly higher for its tighter pacing and irresistible setup, while Iron Flame is bigger, darker, and richer in world-building and political intrigue. Iron Flame has a slower middle that divided some fans, but its ending and expanded stakes thrilled others. Fourth Wing is the more addictive entry; Iron Flame is the more ambitious continuation.
Do I need to read Fourth Wing before Iron Flame?
Yes, absolutely. Iron Flame is book two of the Empyrean series and continues the same story without recapping. You must read Fourth Wing first to understand the characters, the war college, the dragons, and the cliffhangers Iron Flame resolves and builds upon.
