Threshing Day Summary and Review, 13 Dragon Bondings That Quietly Set Up Book Four

Threshing Day is Rebecca Yarros’s new Empyrean collection, and the most surprising thing about it is how much it changes what you think you know about Basgiath. On the surface, this Threshing Day review covers thirteen short stories about thirteen riders meeting their dragons.

Underneath, I found a book that quietly hands over a murder, a forged dragon record, a royal runaway’s declaration of war, and a strong hint about Xaden’s real bloodline. If you are waiting on book four, this is the file you were not told you needed.

Who will love Threshing Day, and who will bounce

You’ll love it if you:

• Have reread Fourth Wing and miss Liam, Garrick, Bodhi, and Imogen more than you’d admit
• Hunt for lore and foreshadowing (dragon lineages, the rebellion relics, the Baran family)
• Prefer the dragons as characters, not mounts. Every story gives one a distinct voice
• Want shorter, bingeable chapters between the long novels

You’ll probably bounce if you:

• Haven’t read the main series (the spoilers start early and they’re major)
• Wanted Violet’s point of view (she appears only through other people’s eyes)
• Get bored by structure. Every chapter follows the same shape: walk in, meet a dragon, get tested, mount, fly
• Expected romance. The yearning is there (Garrick and Imogen especially), but nothing is resolved

2. Introduction

Threshing Day by Rebecca Yarros was published on September 29, 2026 by Red Tower Books, an imprint of Entangled Publishing, in the US and UK, according to Rising Shadow and Book Riot. My copy’s copyright page lists Karen Grove as editor, a “First Edition September 2026,” a Special Edition (ISBN 978-1-68281-808-4), and a Standard Edition (ISBN 978-1-68281-809-1).

Page counts vary by listing: Goodreads lists 224 pages for the hardcover, while CinemaBlend describes it as 204 pages. By my own count, the thirteen stories run to roughly 49,000 words.

The rollout was unusual. As per Kirkus, a preorder titled only “Untitled Empyrean (Not Book Four)” hit No. 1 on Amazon in April 2026, months before Yarros revealed the title in July. She told readers she hoped it would be “a fun trip back to Basgiath while I’m writing book four.”

Featured snippet sections

Quick Verdict: A sharp, emotional, occasionally repetitive collection that turns side characters into leads and plants real clues for book four. Recommended for Fourth Wing fans who care about lore, not newcomers.

Should You Read It?

Pros	Cons
Thirteen distinct dragon personalities, each funny or frightening in its own way	Same story shape thirteen times
Xaden, Sawyer, Sloane, and Aaric chapters are excellent	Garrick’s and Aaric’s stories feel short (Aaric’s is roughly 1,400 words)
Major lore reveals: Glane, Maxim Riorson, Alic’s death	No Violet point of view
Fills gaps between 624 AU and 634 AU	Heavy spoilers make it useless as an entry point
Short chapters, easy to read in one or two sittings	Profanity is constant (I counted 120 uses of one word alone)

What Is It About? Thirteen first-year cadets at Basgiath War College walk into the Threshing Valley hoping a dragon chooses them before another dragon, or another cadet, kills them. Told across ten years, the stories follow Brennan, Mira, Xaden, Garrick, Dain, Bodhi, Imogen, Rhiannon, Sawyer, Ridoc, Liam, Sloane, and Aaric. Together they show who was chosen, why, and what each bond cost.

Rating: 4/5

3. Background

Some context helps here. Yarros’s Empyrean series started with Fourth Wing in 2023, followed by Iron Flame later that year and Onyx Storm in January 2025. According to The New York Times, Onyx Storm sold more than 2.7 million copies in its first week, and Fourth Wing had spent 65 weeks on the New York Times list as of August 2024. Book Riot estimates the series has sold around 13 million copies, though I could not confirm that figure with the publisher, so treat it as an estimate.

Inside the story world, Threshing is the day first-years in the Riders Quadrant enter a forested valley and either bond a dragon, die, or get sent back to repeat the year.

Threshing Day opens with an in-world document, “Trial by Fire,” written by a retired professor, Colonel Thadeus Palme, advising future dragon professors. It sets the tone neatly. Palme admits that “dragons find humans rather… expendable” and that, once cadets enter the valley, “only the opinions of the dragons matter.”

The political backdrop matters too. The “marked ones” are children of the executed leaders of the Tyrrish rebellion, which the Tyrrish call the apostasy. They carry rebellion relics on their arms and were forced into the Riders Quadrant after a deal Xaden struck with General Sorrengail. In Xaden’s year, 631 AU, there are ten of them. By Dain’s year, 632 AU, there are fifteen. In total, the book says there are 107.

The in-world numbers give a sense of the odds. In Xaden’s year, 163 dragons are willing to bond. In Dain’s year, Kaori counts 137, which Dain notes is “far less than last year,” with far more cadets than dragons.

One more detail I didn’t expect: the Palme document says Threshing happens on “the first of October.” Yarros and her husband co-founded a nonprofit called One October in 2019 to help children in the child-welfare system, per her official site.

4. Threshing Day Plot Summary

Part One: The Sorrengail children (624 AU and 627 AU)

Brennan (Marbh, Orange Daggertail). Threshing Day begins with Brennan Sorrengail, the eldest child of Lilith Sorrengail, who is about to take command of the Riders Quadrant. He wants to make his parents proud, and he quietly fears becoming “the greatest disappointment in the Sorrengail line.”

Before he enters the forest, his scribe father, Asher, slips into the valley against the rules to see him. Asher hands Brennan the beaded bracelet he has worn for as long as Brennan can remember and tells him a dragon is “surely the greatest gift a god can give.”

Brennan’s plan is cautious and clever. He climbs the tallest tree he can find to watch for his dragon. Instead, a burnt-orange snout appears inches from his face, and a voice in his head asks, “Are you a bird, Sorrengail?” Brennan falls off the branch.

The orange is Marbh, who calls Brennan “boring” for wanting a safe, predictable dragon and for living in his mother’s shadow. Marbh then sets a game: reach the seat without touching the ground, or die.

Brennan sprints down the branch, jumps onto Marbh’s snout, crawls up his face mid-flight, and claws his way into the seat during a near-vertical climb. “There is only us,” Marbh tells him. Brennan lands as Marbh’s rider.

Mira (Teine, Green Clubtail). Three years later, Mira Sorrengail enters the valley carrying her own version of that pressure. She’s the middle child, and she suspects she is nobody’s favorite. Brennan is now a mender at the front in Tyrrendor, where the rebellion is under way. She stays near her squadmate Cowan Zana longer than she should, until a red approaches and he runs after it.

Then Teine arrives. He snaps his jaws inches from her, knocks down a whole tree beside her, and finally drags a talon down her thigh, slicing through leather and skin, to test whether she will break. She doesn’t. When he asks whether she belongs to her mother or her father, she answers that she belongs to herself.

Teine accepts her as his first rider, warns he won’t mourn if she falls, and flies her to the field. She arrives bleeding, looks for her mother on the dais, and finds she isn’t there.

Part Two: The marked ones arrive (631 AU)

Xaden (Sgaeyl, Blue Daggertail). This is the longest story in the book (about 6,500 words by my count) and the darkest. It’s snowing, unusually early. Xaden, son of the executed rebel leader Fen Riorson, waits with the nine other marked ones and pairs them up, ignoring the rule to go in alone. He and his best friend Garrick head into the center.

Prince Alic Baran, second in line to the throne, ambushes them. Alic holds a jeweled dagger to Garrick’s throat while two friends, Eian and Lorne, hold swords at Xaden’s back. Alic taunts Xaden about owning his family’s land and burned city. Meanwhile, a scarred Blue Clubtail and then Sgaeyl, the navy-blue daggertail Kaori warned everyone never to approach, land in the clearing to watch. Alic whispers “Mine” about Sgaeyl.

Using hand signs, Xaden and Garrick coordinate a counterattack. Garrick kills Eian with Alic’s own dagger. Xaden wounds Alic, gives him one chance to draw his sword, and then cuts his throat. Sgaeyl flicks her tail and splits Xaden’s face from brow to cheek (the scar readers know).

Then she burns all three bodies, leaving nothing.

The bonding conversation that follows is a highlight. Sgaeyl demands total honesty. She also calls Xaden the “grandson of Maxim Riorson,” not Corbin, which Xaden believes was his grandfather. When she asks what he’ll do with her power after his mission, he admits he’d love to burn Basgiath to the ground. Her answer: “And thus, we begin.”

Garrick (Chradh, Brown Scorpiontail). Garrick leaves Xaden alone with Sgaeyl, terrified for him. He watches the pair fly overhead and nearly collapses with relief. Soon after, a Navarrian cadet runs toward Garrick and his friend Masen screaming at an Orange Clubtail to kill “the separatist dogs.” The orange burns her instead. Masen walks toward it: the orange is his.

Garrick follows a voice he’s been hearing all day. It belongs to Chradh, a brown scorpiontail curled up so still he looks like a boulder. Chradh says he has “finally” chosen to involve himself with humans “again,” which makes no sense for a 27-year-old dragon with no recorded riders. When Garrick points that out, Chradh replies, “What even is a year?” Garrick lands last, but all ten marked ones bond.

Part Three: The year after (632 AU)

Dain (Cath, Red Swordtail). Dain Aetos’s father, Colonel Aetos, keeps showing up at his classes. Before Threshing, he corners Dain and asks him to report any marked one who breaks the Codex, especially Xaden. He uses Violet’s safety to pressure him. He also insists Dain bond a green, and admits he asked his own dragon to speak to other dragons on Dain’s behalf.

In the forest, Dain catches a falling second-year, Joelle Tadita, while perched in a tree.

Then a green and a red pass beneath him at the same moment, and a voice threatens to burn him if he chooses wrong. Dain jumps onto the red. It’s Cath. During a terrifying climb, Cath asks whether Dain’s loyalty lies with the Codex or his father. Dain says it lies with Cath. “Never forget that,” Cath answers. “It is the only condition of my allegiance.”

Bodhi (Cuir, Green Swordtail). Bodhi Durran, Xaden’s cousin, gives the other marked ones a weak pep talk and feels like a lesser copy of Xaden. Xaden turns up anyway, technically “observing.”

They watch four First Wing cadets, who were sneering about the marked ones, die after approaching a red as a group. Neither warns them, and Xaden later forces Bodhi to admit that.

Xaden tells him Sgaeyl says a dragon named Cuir is waiting. He also shares a theory: dragons sympathetic to the marked ones’ cause may be seeking out riders with rebellion relics. Bodhi, sick of having his choices made for him, charges a Blue Clubtail instead. The blue opens its mouth to burn him.

Cuir swoops in, grabs Bodhi out of the fire with his talons, and gives him a deadline to climb up from the claw to the seat. “I will always give you a choice,” Cuir tells him, and then adds that he will not always accept it.

Imogen (Glane, Orange Daggertail). Imogen Cardulo is furious at everything, including Garrick, who never came to say goodbye before he left for Basgiath. He finds her in the forest and tells her that her dragon is Glane. Imogen already knows. She has carried Glane’s relic on her hip since Presentation and kept quiet about it.

Then Glane channels power into her before they’ve even flown, which Garrick says shouldn’t be possible. Imogen survives by using the grounding technique her mother and sister taught her.

Glane then shoots fire at Imogen’s Navarrian best friend, Quinn. Imogen shields her behind a petrified oak and confronts the dragon. The big secret comes out: Imogen remembers Glane from age five as her grandmother’s dragon. The Compendium lists Glane as a 19-year-old with no riders. Imogen threatens to expose her unless she leaves Quinn alone. Glane agrees, and then Quinn’s dragon, Cruth, walks out of the trees.

Imogen flies off thanking her dead mother and sister, carrying “a secret that would destroy Kaori’s faith in the Empyrean.”

Part Four: Violet’s year (633 AU)

From here Threshing Day warns that the stories spoil Fourth Wing.

Rhiannon (Feirge, Green Daggertail). Rhiannon is the happiest cadet in the forest. A voice keeps saying, “Come find me.” She stumbles on Visia, a cadet whose face has been badly burned by an orange, and refuses to leave her even when an observing second-year, Eya, tells her to move on.

When the orange returns, Rhiannon stands between it and Visia. Feirge arrives and holds her daggertail against the orange’s throat. Feirge is sarcastic and impatient, and she chose Rhiannon partly for standing up for Violet during Presentation. Rhiannon asks Eya to tell Visia she’ll be welcome in second squad, and Eya predicts Rhiannon will become squad leader.

Sawyer (Sliseag, Red Swordtail). Sawyer Henrick is repeating the year after going unchosen, and he has decided he will bond or die. He finds squadmate Trina hiding in a bush.

They break the rules and walk in together. In a clearing, an orange named Bregh chooses Trina, and a red named Sliseag chooses Sawyer. Sliseag lists Sawyer’s flaws (terrible bow work, awkward flirting) and then explains why he wasn’t chosen the year before: “I simply wasn’t available to you.”

Then Trina falls from Bregh during the flight and dies. Sliseag tells Sawyer to choose: climb or wallow. Sawyer climbs, and tells Sliseag he would have repeated another year if he’d known Sliseag was waiting.

Ridoc (Aotrom, Brown Swordtail). The book’s comic relief. Ridoc has vomited three times before entering the forest. At a stream, a young brown named Aotrom splashes water on him. Ridoc tries to reject him for being too young and immature. Aotrom walks off, offended, then climbs a redwood like a cat and dares Ridoc to reach his back. Ridoc hooks his belt over Aotrom’s swinging swordtail, gets flung into the tree, leaps onto Aotrom, and leaves a trail of sap on his back as revenge.

Aotrom’s verdict: “I would say it makes us equals.”

Liam (Deigh, Red Daggertail). Liam Mairi sits under a tree whittling a wooden figurine of Deigh, because his instinct told him to wait. Xaden visits, and Liam teases him about staring at “the general’s daughter.” Xaden claims he fantasizes about killing her. Liam doesn’t buy it.

Then Sgaeyl tells Xaden that Violet has gotten involved with “Sgaeyl’s pet” (the small golden dragon Fourth Wing readers know), and he rushes off. Deigh appears, approves of the tree he chose from Liam’s memories of home, and tells Liam, “You’re not.

But we will be.” The story ends with Liam mounting up and calling this the next, and last, chapter of his life, which hurts if you know what happens to him at Resson.

Part Five: After Liam (634 AU)

From here the book warns that the stories spoil Iron Flame.

Sloane (Thoirt, Red Daggertail). This is the heaviest chapter, and the book’s content warning for suicidal thoughts applies most here.

Sloane Mairi enters the valley intending not to bond. She blames Violet and Dain for Liam’s death. Imogen finds her, says her dragon is a red named Thoirt, and gives her the figurine Liam was carrying when he died.

Sloane walks for hours.

Dragons step over her. Finally she screams that she doesn’t want to be a rider and walks straight toward an Orange Swordtail as it breathes fire. Dain, now her wingleader, tackles her out of the way, breaking Codex to save her. She swings at him, kicks him, and yells that he got Liam killed.

He doesn’t deny it. Then Thoirt lands. She is Deigh’s sister. She offers Sloane what she needs most, a choice: Thoirt won’t channel to her until Sloane is ready. She also tells Sloane she inherited her mother’s rune gift, which Liam didn’t. Sloane flies off feeling, for the first time in months, like she’s home.

Aaric (Molvic, Blue Clubtail). The shortest story closes the book. Aaric, who entered the quadrant under the fake name Graycastle, is actually Camlaen Aaric Baran, a prince of Navarre and Alic’s younger brother. He spent five hours hunting Molvic, the blue that wanders Threshing every year and never bonds. Molvic was drawn to the Baran bloodline once before, with Alic, and was disappointed.

He tries to burn Aaric. Aaric dives, gets up, and keeps walking toward him. He tells Molvic he won’t stand with his family’s complicity and finishes with the book’s final threat: “I intend to tear this kingdom apart.”

Threshing Day ending explained

Molvic accepts “Aaric Graycastle,” not Aaric Baran, as his rider. The last lines say no one in Aaric’s family knows he’s missing, and he is “coming for them all.” In other words, Threshing Day ends with a prince declaring war on his own throne.

Here’s what makes the ending smarter than it looks.

If you read Xaden’s chapter carefully, the scarred Blue Clubtail watching Alic die is very likely Molvic: a big blue clubtail with a scar across its snout, retreating instead of protecting Alic. (Bodhi’s chapter describes the same scarred blue clubtail, “isn’t on Kaori’s list.”) Molvic tells Aaric he didn’t kill Alic.

That’s true. Xaden did.

Threshing Day never confirms whether Aaric will learn this, but it puts the two most dangerous secrets in the series side by side in the reader’s lap. That’s the setup I’ll be watching for in book four.

5. Threshing Day Analysis

5.1 Characters

Xaden Riorson. The most interesting thing about Xaden here is that he’s twenty and not yet the man readers know. He’s protective to the point of murder, and the book doesn’t pretend otherwise.

He kills Alic “because I could,” as he admits to Sgaeyl, and a year later he lets four cadets walk into a red without warning them. Bodhi notices: Xaden “hardly ever” smiles anymore. It’s a darker portrait than fans might expect, and I liked that Yarros didn’t soften it.

Bodhi Durran. The surprise of the collection. Bodhi is the overlooked cousin who keeps everything running and never gets credit. His rebellion (charging the wrong dragon simply to make one choice that’s his own) is reckless and very human.

Cuir’s line that Bodhi seeks “power to end harm, instead of the means for victory” is probably the clearest moral statement in the book.

Sloane Mairi. Her chapter does the most emotional work. Grief turns into rage, and rage into a plan to die. Yarros writes it carefully: Sloane fakes smiles, notices how good she’s getting at it, and only tells the truth when Dain forces her to. Thoirt’s promise, that Sloane “will never see a sunrise” without her, landed hard for me.

Dain Aetos. Dain is set up here as someone pulled between his father and his dragon. His father plants suspicion of the marked ones in him using Violet as bait. Cath’s condition (that the bond comes before every order) hangs over everything Dain does in the novels.

Two years later, in Sloane’s story, he breaks Codex to save a marked one’s sister. That arc is subtle, and I think it’s the best use of the collection’s timeline.

Imogen Cardulo. Funny, profane, guarded. Her internal monologue about Garrick is the closest thing the book has to a romance plot, and her logic is painful: everyone who gets close to her dies, so she pushes him away to keep him alive. Her secret about Glane is the biggest lore drop in the book.

Sawyer Henrick. His chapter is about shame. He did everything right last year and still wasn’t chosen. Sliseag’s answer (you weren’t unworthy,

I wasn’t ready) is something many readers who’ve repeated a grade, failed an exam, or missed a promotion will feel. Trina’s death cuts right into his relief, and Sliseag’s choice of “climb or wallow” is harsh but true to dragons.

Aaric. Aaric gets the least space and probably the most plot weight. He mourns the childhood version of Alic, not the cruel cadet. He speaks nine languages. And he openly renounces his family. I wanted twice as many pages from him.

The dragons. Truthfully, the dragons are the best characters. Marbh is a show-off (“Glorious One, Brilliant One”). Feirge is a sarcastic schoolteacher. Aotrom acts like a teenager. Sliseag is brutally honest. Glane lies about her own age. Each one tests its rider differently, and the test always fits the rider’s weakness. Brennan’s is unpredictability; Mira’s is pain; Ridoc’s is being taken seriously.

Weak spots. Garrick’s chapter, about 2,300 words, feels like a bridge between Xaden’s and Imogen’s. Rhiannon’s is warm but has little conflict. Ridoc’s is fun but light. None are bad; they just don’t go deep.

5.2 Threshing Day Themes and Symbolism

Choice and consent. This is the theme that holds the collection together, and I think it’s the real subject of Threshing Day. Threshing is sold to cadets as dragons choosing riders. Yet almost every story turns on a human choice made against instructions. Dain chooses red over his father’s green.

Bodhi charges the wrong dragon “done having my choices made for me.” Cuir promises Bodhi “a choice.” Thoirt offers Sloane “choice.” Sawyer is told “choose,” and Aaric tells Molvic, “Your choice. Mine is already made.”

Even Brennan’s arc starts with him doing “the opposite” of what he’s been taught. The message seems to be that a bond only works when both sides choose it.

Inheritance and legacy. Brennan fears his mother’s shadow. Mira feels like nobody’s child. Dain is suffocated by his father. Bodhi lives in Xaden’s shadow. Aaric rejects his bloodline. Even the dragons care about lineage. Thoirt says the dragons of her line “have long chosen the riders of yours.” The Compendium entries, which list each dragon’s descending line, act as a kind of family tree running parallel to the humans’.

Children paying for their parents. The marked ones are punished for their parents’ rebellion. Liam says it plainly to Xaden: “it’s wrong to punish someone for their parent’s actions.”

Ironically, he says this about Violet, the daughter of the general who hunted his parents. Threshing Day keeps reversing that logic. Aaric pays for Alic’s cruelty, and Molvic nearly kills him for it.

Records versus truth. The framing note says the text was “faithfully transcribed” by professors Kaori and Mynna and that “all events are true.” Yet the stories contain things no professor could know (Xaden’s murder, Glane’s false record, Aaric’s real name).

Palme’s preface laments that no one records what really happens in the valley. Threshing Day shows why: what really happens would get people executed. I read the framing as a deliberate joke on official history.

Symbols. Trees recur in nearly every chapter: Brennan climbs one, Dain climbs one, Imogen meets Quinn at a lightning-split oak, Liam waits under a Polylepis from home, Aotrom climbs a redwood. Trees are where these kids hide, wait, and launch.

The wooden figurine of Deigh, carved by Liam and handed to Sloane, is the clearest symbol of grief passed between siblings.

And Asher’s black-beaded bracelet, given to Brennan in the first story, carries the “luck” theme of Zihnal through the book.

6. Evaluation

Threshing Day is a smart, often moving collection that works best as a secret history of the Empyrean series rather than a standalone book. It made me cry once (Sloane), laugh several times (Ridoc and Aotrom), and reread Xaden’s chapter twice to catch everything.

6.1 Strengths

Voice. Thirteen narrators, and most sound different. Ridoc’s jokes, Imogen’s swearing, and Aaric’s calm all land.

The dragons. The best dragon writing Yarros has done. Each bonding feels like a personality test.

Connective tissue. Small details connect across years. Teine’s scales in Violet’s armor come up in Rhiannon’s story; a scarred blue clubtail who is never on Kaori’s list shadows several chapters; Liam’s figurine reappears in Sloane’s.

Lore that matters. Glane, Maxim Riorson, Alic’s death, and the theory that sympathetic dragons seek out marked ones all feel like setup, not filler.

6.2 Weaknesses

Repetition. Same structure thirteen times. By the ninth chapter I could predict the beats: walk in, feel a tug, meet the dragon, get tested, mount, fly.

Uneven length. Xaden gets roughly 6,500 words while Aaric gets about 1,400, and the shortest story may be the most important one.

No Violet. I understand why, but the series’ main narrator is missing from her own Threshing.

Profanity overload. I counted 120 uses of “fuck” and its variations in about 49,000 words of story. It suits these characters, but it gets monotonous.

6.3 Impact and controversy

Emotionally, the collection affected me more than I expected from a “bonus” book. Sloane’s chapter in particular handles grief and suicidal thinking with real care. Threshing Day flags these themes in its content warning, which also lists intense violence, burning, and graphic language. If you’re struggling with thoughts like Sloane’s, please reach out to someone you trust or a crisis line (988 in the US).

There’s also mild controversy among readers. Many Goodreads reviewers rate it highly (the page showed an average of about 4.58 from more than 187,000 ratings when I checked in October 2026), but critical reviewers call it filler or say the price is steep for what amounts to a novella.

Yarros herself said she originally wanted a surprise drop with no preorder, and warned early copy holders not to leak it, according to Brit + Co. Either way, I don’t think it’s a cash grab. A cash grab wouldn’t bother planting this many clues.

6.4 Comparison with similar works

Stephenie Meyer’s Midnight Sun (2020). Retells Twilight from Edward’s view. Threshing Day does something smarter by giving thirteen people one scene each instead of one person the whole story.

Sarah J. Maas‘ A Court of Frost and Starlight (2018). A bridge novella between ACOTAR arcs. Both books exist to tide fans over, but Yarros’s has more plot consequence. Book Riot notes Maas’s next ACOTAR novel is due October 27, 2026, so the two series are once again releasing side by side.

Star Wars: From a Certain Point of View (2017). The closest structural match: side characters retell a famous event. Yarros does it alone instead of with forty authors, which keeps the tone consistent.

On this site: If you’re catching up, my full-spoiler Fourth Wing analysis, the Iron Flame review, and the Onyx Storm review cover the main novels. For the bigger picture of why romantasy keeps topping charts, see BookTok to Bestseller Pipeline.

Fans of brutal academy and arena settings may also like We Who Will Die and Maas’s House of Flame and Shadow.

7. Personal Take: The Kids Who Pay for Their Parents’ War

The angle that stuck with me most is this. The marked ones are children separated from their families by the state and placed with strangers. Liam and Sloane were sent to different households after watching their parents die “within twelve hours.” Imogen was one of three marked ones placed alone. Liam writes letters to his sister he can’t send.

This isn’t only fantasy. According to preliminary federal AFCARS data for FY2025, 331,747 children were in out-of-home care in the US on September 30, 2025, and 15,030 left the system by aging out. In England, a Family Rights Group study found 49.5% of sibling groups in care were split up (using 2014 council data). Yarros, who adopted her youngest child from care and co-founded One October in 2019, clearly knows this world.

Five lessons I took from it:

1. Siblings anchor survival. Sloane’s turning point comes from her brother’s figurine, not a speech.
2. Kids carry adult guilt that isn’t theirs. Xaden feels responsible for 107 lives at twenty.
3. Someone choosing you changes everything. Thoirt doesn’t fix Sloane. She commits to staying.
4. Rage often hides grief. Imogen and Sloane both lead with anger because sadness feels unsafe.
5. Agency heals. Cuir and Thoirt both offer choice first. For kids who’ve lost every choice, that matters more than power.

8. Threshing Day Quotes

• “Everything is a game if you’re smart enough to see the board.” (Marbh to Brennan)
• “Dragons don’t bond cowards.” (Brennan)
• “Guess dragons think trust begins with pain.” (Mira)
• “I belong to myself.” (Mira to Teine)
• “Don’t conflate a title with power.” (Xaden to Prince Alic)
• “And thus, we begin.” (Sgaeyl to Xaden)
• “Then what truly holds your allegiance?” (Cath to Dain)
• “Because you seek power to end harm, instead of the means for victory.” (Cuir to Bodhi)
• “This place changes everyone, including you.” (Xaden to Bodhi)
• “If we don’t change, we die.” (Xaden)
• “In that, we are matched.” (Glane to Imogen)
• “You coagulate quickly, Rhiannon. What an excellent sign.” (Feirge)
• “I simply wasn’t available to you.” (Sliseag to Sawyer)
• “If I’m five, then you’re four.” (Aotrom to Ridoc)
• “You’re not. But we will be.” (Deigh to Liam)
• “You will never see a sunrise where I am not waiting for you.” (Thoirt to Sloane)
• “Your brother did not inherit your mother’s gift. You did.” (Thoirt)
• “I am not my brother.” (Aaric to Molvic)
• “I intend to tear this kingdom apart.” (Aaric)

9. Conclusion

Threshing Day isn’t the book four that fans are waiting for, and it never pretends to be. Still, I finished it convinced it’s the most important “extra” Yarros has published, because it hides real plot in plain sight. Xaden’s first kill, Glane’s forged record, Sgaeyl’s hint about Maxim Riorson, Sloane’s rune gift, Dain’s split loyalty, and Aaric’s declaration all point forward.

Who should read it: Fourth Wing readers who have finished all three novels, lore hunters, Liam and Sloane fans, and anyone who thinks the dragons are the best characters.

Who should skip it (for now): Newcomers, readers who want Violet front and center, and anyone tired of formula.

My final verdict stays at 4/5. Above all, it reminded me why Basgiath works: everyone in that valley is choosing something, even when it looks like the dragons choose everything.

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