Fourth Wing Series Book 4: Release Date & Updates

If you finished Onyx Storm and immediately opened a new browser tab to search for the fourth wing series book 4, you are not alone. That ending did what it did, and now we’re all sitting here refreshing Rebecca Yarros’s social media like it’s a second job. This page is the organized, no-fluff tracker for everything confirmed about the fourth Empyrean installment — separated cleanly from the BookTok speculation that’s been circulating since January 2025.

What We Know About Fourth Wing Series Book 4

Rebecca Yarros is actively writing the fourth Empyrean book. That’s the confirmed baseline. She has acknowledged on record that the series is planned as exactly five books — meaning Book 4 is the penultimate installment, not the finale, and the story’s resolution is still one more volume away after this one. That distinction matters for how we read the cliffhangers.

Empyrean #4 (Untitled)

Here is a clean breakdown of what’s confirmed versus what’s still noise:

Confirmed facts:

• Rebecca Yarros has confirmed she is writing Book 4
• The Empyrean series will be exactly five books total
• Book 4 does not yet have an official title — it is currently untitled
• Book 4 is not the final book; that would be Book 5
• The series follows Violet Sorrengail as the central protagonist across all five installments

Debunked or unconfirmed:

• Any specific release date circulating online — none has been officially announced
• A claimed title for Book 4 — nothing has been confirmed by Yarros or her publisher
• Rumors that the series was cut to four books — Yarros has explicitly stated five
• Claims that Book 4 is “finished” or “in final edits” — no such update has been given

What Yarros has not confirmed: a publication timeline, a cover reveal schedule, or a working title. Anything you’ve seen claiming otherwise is fan extrapolation or outright misinformation. The book exists, it’s being written, and the five-book arc is locked in. That’s the honest summary of where we are.

Release Date Speculation: When Will Empyrean Book 4 Drop?

No official fourth wing book 4 release date has been announced. But the publishing pattern across the first three books gives us a reasonable framework for projecting when to expect it.

The gap between Iron Flame and Onyx Storm stretched to roughly 14 months — significantly longer than the compressed six-month window between Books 1 and 2. That earlier pace was exceptional and almost certainly unsustainable; Yarros has spoken publicly about the physical and creative toll of that schedule.

If the Onyx Storm gap (14 months) becomes the new baseline, a late 2026 release is plausible. A late 2025 release would require the manuscript to be nearly complete right now, which doesn’t align with any confirmed update from Yarros as of this writing. The more conservative estimate — and the one that accounts for Yarros’s health, the complexity of the series’s expanding lore, and standard editorial timelines — lands somewhere in the first half of 2026, with a possible announcement in late 2025.

What to watch for: Yarros tends to share writing progress updates on social media in the form of word count milestones or vague “deep in drafts” posts. A cover reveal or title announcement would signal that the manuscript is in late-stage editing, which is typically 4–6 months before publication. Until that happens, any specific date you see online is a guess — including this one.

The Onyx Storm Fallout: Where Book 4 Must Pick Up

⚠ Full spoilers for Onyx Storm below.

Onyx Storm

Onyx Storm ends with the kind of structural damage that a series can’t easily walk back. Violet has crossed into Poromiel and made contact with the Sage — the venin leader whose power operates on a scale that fundamentally reframes the threat the riders have been training to fight. The wards that protect Navarre are failing. The political infrastructure of the Riders Quadrant is fractured. And Xaden’s venin corruption, which had been a slow-burn thread across Books 2 and 3, has accelerated into something that can no longer be quietly managed.

That last point is where the fourth wing book 4 spoilers territory gets complicated. Xaden’s arc in Onyx Storm forces a question the series has been circling: at what point does the corruption change who he is, not just what he can do? The book doesn’t answer it. It leaves Violet in the position of knowing something about Xaden that he may not fully understand about himself, and the power imbalance that creates — emotionally, tactically, and in terms of who gets to make decisions about the war — is what Book 4 has to carry from its first chapter.

The immediate stakes going into Book 4:

• The ward collapse. Navarre’s magical protections are actively degrading. The political class that has controlled information about the venin threat is losing the ability to suppress it. Book 4 presumably opens into a world where that secret can no longer be kept.
• Xaden’s corruption timeline. How far can it progress before it becomes irreversible? The series has introduced enough lore around venin transformation to suggest there’s a point of no return — and Onyx Storm put Xaden uncomfortably close to it.
• Violet’s position. She ends Book 3 with knowledge and alliances that the Riders Quadrant leadership doesn’t have and wouldn’t sanction. She is, functionally, operating outside the institution she was trained by. That’s a different Violet than the one who walked into Basgiath in Book 1.
• The Sage’s agenda. The venin leader’s appearance in Book 3 wasn’t a cameo — it was a setup. Book 4 has to deliver on what that confrontation means for the war’s actual shape.

Onyx Storm is 527 pages, and the ending uses almost all of that real estate to complicate rather than resolve. Book 4 inherits a genuinely layered situation, not just a romance cliffhanger.

Top BookTok Theories for Book 4 (And How Likely They Are)

BookTok has been running at full speed since Onyx Storm dropped in January 2025. Some of the theories circulating are grounded in real textual evidence. Others are wishful thinking dressed up as foreshadowing. Here’s where the fourth wing book 4 updates conversation stands, broken down by what the books support.

Fourth Wing

Rebecca Yarros · 2023 · 528 pages · Book 1 of 5

Spice: 3/5 · Tropes: Enemies to lovers, forced proximity, morally-gray hero · POV: 1st Person Female

Trigger Warnings: Graphic violence, death, war, loss of loved ones, grief, blood, bullying

Setup: The foundational rules established in Book 1 — particularly around dragon bonding — are the lore architecture that every Book 4 theory has to account for.

The dragon bonding premise in Fourth Wing operates as a hard mechanic: dragons choose, and that choice is binding in ways the narrative treats as near-immutable. Theory-crafters have to work within that constraint, which is why the more interesting BookTok predictions aren’t about whether bonds can be broken, but about what happens when the person bonded changes — which is precisely Xaden’s situation. The bonding rules also established early that dragons perceive things about their riders that the riders themselves may not consciously know. Tairn and Andarna’s behavior in Book 1 laid groundwork for a kind of dragon-as-early-warning-system that the fandom has been tracking across all three books.

One thing worth noting from my own read of Fourth Wing: while the dragon bonding premise that forces the main pair together is a strong structural hook, the choppy writing style—where chapters often end on a mini-cliffhanger only to skip forward a day later—makes it feel like key conversations happen off-page. Theory-crafters need to remember that this rigid plot mechanic has to be honored, even if the narrative sometimes glosses over the details. The theories that ignore that rigidity tend to be the least convincing ones. The book’s pacing moves so quickly that it often skips over how certain lore rules function, which is exactly why readers who are deep in the theory space need to anchor their predictions to what the text explicitly established.

Iron Flame

Rebecca Yarros · 2023 · 639 pages · Book 2 of 5

Spice: 3/5 · Tropes: Protector romance, found family, enemies to lovers · POV: Dual POV

Trigger Warnings: Imprisonment, torture, death, dismemberment, war, intense violence

Setup: The venin lore and ward mechanics introduced in Book 2 are the primary evidence base for the most credible Book 4 theories currently circulating.

Iron Flame is where the series shifted from romantasy with dragons to something with genuine geopolitical and magical stakes. The ward mechanics — specifically how they were built, what they require to sustain, and what their failure would mean — are the load-bearing lore for at least three of the top BookTok theories. The revelation that the wards are tied to something darker than the riders were told reframes the entire institutional structure of Navarre. Book 4 theories that predict a full collapse of the Riders Quadrant as a political entity are drawing directly from this.

The venin corruption arc introduced in Iron Flame is the other major theory driver. The dual POV structure of Book 2 gave readers direct access to Xaden’s perspective during early corruption symptoms — and what that POV revealed is that the transformation isn’t just physical. The cognitive and emotional drift is subtle enough that Xaden himself doesn’t always clock it. That’s the detail the most compelling theories are built on.

Frequently Asked Questions About the Empyrean Series Future

Will Fourth Wing have a fourth book?

Yes. Rebecca Yarros has confirmed that the Empyrean series will span exactly five books, which means a fourth installment is a planned, confirmed part of the series arc — not a possibility or a rumor. The fourth book is currently untitled and being written.

Has Rebecca Yarros started writing book 4?

Yes. Yarros has confirmed she is actively working on the fourth Empyrean book. She has not shared a specific word count milestone or completion percentage publicly as of this writing, but the project is underway.

Is Rebecca Yarros’ Untitled Empyrean book 4?

The fourth Empyrean book does not yet have an official title. Any title you’ve seen attached to it online has not been confirmed by Yarros or her publisher, Entangled Publishing. “Untitled Empyrean #4” is simply the placeholder used by booksellers and fan databases.

What is the newest book in the Fourth Wing series?

As of early 2025, the newest released book in the Empyrean series is Onyx Storm, which published in January 2025. It is the third book in the series. The fourth book has not yet been released.

Is there a fourth book after Onyx Storm?

Yes. Onyx Storm is Book 3 in a planned five-book series. A fourth book is confirmed and in progress. It will be followed by a fifth and final book. Yarros has been clear that Book 5 is the intended conclusion of Violet’s story.

What to Read While Waiting for Book 4

The honest answer is that nothing is going to replicate the specific combination of dragon warfare, layered political intrigue, and a romance with actual structural tension that the Empyrean series runs on. But if you need something to do with your hands while Yarros writes, there are a few directions worth considering.

If the world-building and war stakes are what you’re chasing, From Blood and Ash by Jennifer L. Armentrout scratches a similar itch — it’s a fantasy romance with a slow-building mythology, a morally complicated male lead, and a female protagonist who is more capable than the people around her want to admit. The series is long, which helps.

If the enemies-to-lovers tension with genuine magical stakes is the draw, A Court of Thorns and Roses by Sarah J. Maas is the obvious recommendation, and it earns that status. The first book is slower than Fourth Wing, but by A Court of Mist and Fury the series hits a register that feels emotionally comparable to where the Empyrean books have been going.

If you want something shorter and more contained while you wait, The Bridge Kingdom series by Danielle L. Jensen delivers sharp political intrigue, a romance built on mutual deception, and a pace that doesn’t drag. It won’t fill the dragon-shaped hole, but it’s a solid two-book commitment that won’t leave you waiting for the next installment.

None of these are substitutes. But they’re better than refreshing Yarros’s Instagram for the fifteenth time today — which, to be fair, is also a valid use of your time.