1 - 20 of 562 Works in Mercymorn the First (Locked Tomb Series)
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Religious Trauma and Other Fun Party Tricks by ellaheartsyou
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
03 Dec 2025
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Summary
Gideon Nav wanted rugby, hot college babes, and maybe a degree. So she applies to Canaan University for a rugby scholarship, fully expecting to coast through college on muscle and vibes. Instead, she gets sorted into the mysterious, and notoriously weird, Ninth House. College was supposed to be simple. The Ninth, apparently, had other plans
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Magna-Save by flippancy
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
01 Dec 2025
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It’s the summer of 1986, and all hell is about to break loose in the sleepy town of Drearburh, PA.
What starts as a simple rivalry at the local arcade between Gideon and Harrowhark slowly blooms into the town’s only chance at uncovering the truth behind a mysterious murder.
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her every movement in my head by silasoctakiseron (sharptoothed)
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
30 Nov 2025
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Summary
These few remaining Saints, of course, generally found themselves more than busy in combating threats to the Emperor in the furthest reaches of space, ripping great, nourishing blooms of thanergy wherever they went. They interacted with the Houses primarily through the Cohort and sporadic collaboration with the Order of the White Glass. Their few visits to the worlds they had constructed were rare, treasured occasions met with significant festivity. The subjects residing on their Houses met them with adoration rivalled only by their love for the Emperor.
Roughly one-half, at minimum, of the entire House of the Eighth’s adoration for its Lyctor, the Saint of Joy, emanated from its Master Templar, Silas Octakiseron.
Silas has admired the founding Lyctor of his House since childhood. At Canaan House, he has a dream.
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Hold you high above the flames by jarofbeees
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
29 Nov 2025
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Summary
"The Houses have grown fat on the Cohort's efforts. They linger within the safety of Dominicus, entirely unaware of the sacrifices we make to protect them. The time has come to call upon their sons and daughters, to enlist their blood for the glory of the Emperor Undying."
aka
What if you took the coffee shop AU River bubble but made it fucked up? The finest adepts of the Nine Houses face 'recruitment' into the Cohort, against their better judgment and their will. Harrowhark knows she's walking into the jaws of death, alongside seven others.
This will not be gentle. Please read the tags and intro.
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Sin and the Sentence by Lozergirl_Everest
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir, Arcane: League of Legends (Cartoon 2021)
26 Nov 2025
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Summary
Jinx, Vi, Harrow, and Gideon are all members of Powder Bomb. A punk band fronted by Jinx. After a run in with a record label, and some creative differences, tensions rise and relationships strain.
Simultaneously, another band is threatening to take their spot to be signed onto a label. But they need a bassist, and who better to join them but the bassist of Powder Bomb, Vi.
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Eden's First Flower by frontlinetitties
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
23 Nov 2025
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Summary
Harrowhark Nonagesimus was brought in this world for one reason: to restore her family's name. Now that she's married into the wealthiest family in the empire, Harrow finally has a chance to restore her province to its former glory. As she navigates political intrigue and a tumultuous marriage with Ianthe Tridentarius, a woman equal parts alluring and infuriating, Harrow is haunted by the ghost of a love that could have been. Will Harrow settle into the comforts of her new life, or will the ghosts of her past become too strong to ignore?
Once a stableboy in the backwater province of Drearburh, Gideon is pulled into the spotlight when Blood of Eden takes her under their wing. Separated from the only person she loves and forced to be a figurehead for a movement she doesn't believe in, Gideon must find her way back to Harrow - no matter who or what is in her way.
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After the events of Drearburh's Dying Breath, Harrow is stuck in a marriage of convenience and Gideon had become Blood of Eden's plaything. Queue resentment, hate sex, and a lot (a LOT) of yearning.
Series
- Part 2 of Drearburh's Dying Breath
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Some Other Town, Someone Else's Life by smogwife
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
23 Nov 2025
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Summary
"Some people take the view that we happen by accident. I think that there is something much deeper, of which we have very little inkling at the moment." - Sir Roger Penrose
“Existence is a fact. We are all here and now. Nonexistence is an abstraction of the human mind... This is the reason I think that a [cyclic universe], which has always existed, is simpler than one that has been created." - Nelson Pinto-Neto
Somewhere deep in the Mojave Desert, a conservationist remembers a life she never lived and a woman she’s never met. When a mysterious redhead blows into town, memory begins to bleed across lifetimes and reality becomes more idea than fact. Her only salvation lies in the golden eyes that undid her in the first place.
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Or: We're so post-canon we're in a new universe because so help me Jod they will have their happy ending.
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This Isn't How it Happens by Lillian_azure
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir, Arcane: League of Legends (Cartoon 2021), She-Ra and the Princesses of Power (2018)
12 Nov 2025
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Summary
In every world, she sees her. A stranger with a familiar face, always just out of reach. Every reality has brought them together again, dancing through countless lives - yet never quite touching. Is this the way the story goes? Harrow will find her eventually, will make this real. She has no other choice. Is this how it happens?
Harrow finds herself living in the Arcane & She-Ra universes, haunted by her missing cavalier. Piltover is under attack, and Etheria is at war. Harrow will have to do whatever it takes to survive, even as worlds crumble around her. -
Black Seeds That You've Sown by Red Eyes Black Scythe (VisceraNight)
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir, SCP Foundation
06 Nov 2025
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Summary
Mercymorn's alternate selves from other timelines - timelines where the SCP Foundation still exists - are trying desperately to contact her, each for their own reasons.
If she were somehow to remember who she was before the Resurrection, she could unravel everything that her God has done. John is trying to prevent that from happening.
(You CAN read this if you're fandom-blind to the SCP Foundation. You'll just have a somewhat different and slightly more confusing experience than readers who get all the references.)
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The Marshmallow Test by AWorldOfTrees
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
05 Nov 2025
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Summary
In the refectory, He told Samael and Anastasia to sit at the table, and then got them each one of the smaller breakable plates that adults ate salad off of at lunchtime. He put a ginger biscuit on each plate.
“I am going to make myself a cup of tea,” God said. “When I get back, I will give anyone who hasn’t touched their biscuit yet a second one.”
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The woman in the attic by babitron for Gingerrrrsnaps
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
26 Oct 2025
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Summary
Anastasia, an orphanage worker, moves to a newly ordained priest's house on impulse, leaving her entire life behind. There, she meets a captive woman by the name of Alecto, and they quickly form a friendship based on nightly visits. Though there usually is not much to talk about, feelings bubble up to the surface as Alecto gets more impatient with her captor.
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tried to tell you, didn’t know how to say by fatedfragment
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
18 Oct 2025
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Summary
"Nona, do you remember how old you were when you came here?"
Nona gave Harrow a withering expression that caused Gideon to stifle a chuckle. Without a word, it was as if she was asking, ’are you stupid?'. She held up her hands, wiggling all of her fingers. She was ten when she'd had a seizure. Ten when her mother died, leaving her alone in a nightmare she hadn't woken up from.
Harrow felt a stab of pain in her heart upon seeing that weak glare. It was far too young of a face to pretend to be tough, too innocent of a gaze to have seen that much pain. She blinked against the pressure forming in her eyes, determined not to cry.
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Gideon and Harrow stumble upon a loose end from Drearburh — in the form of a child. Camilla and Palamedes realize language development is easier than they expected. Nona loves her small, strange family more than anything.
Series
- Part 3 of t4t modern griddlehark
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Day 15 Age Gap by CrowandAngelWings
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
16 Oct 2025
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Summary
Ianthe's only friend on Mithraeum is insane. As fun as it is to mess with Harrowhark, there's no assurances with her and when the world is constantly burning around them it doesn't hurt to have friends in slightly higher places, no matter what it takes to becomes...friends...
Series
- Part 15 of The Locked Tomb Kinktober 2025
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An Important Message by RosesandWorms
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
14 Oct 2025
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Summary
During a training session, something unexpected takes over Harrow's body while she's in the River. This is Gideon's chance to say what she has to say.
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Got a Secret by jugglingjujube
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
12 Oct 2025
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Summary
On the last night at the Ninth House Foster Home, Gideon Nav and Harrowhark Nonagesimus get into their biggest fight yet. It doesn't matter, because she's leaving the next morning to live with Pyrrha in New Rho.
Two years later, Gideon reluctantly returns to Dominicus to attend Canaan university on a full scholarship from a mysterious benefactor. That's when she starts getting mysterious texts that know all, see all and tell all. Who is sending them and why are they so determined to destroy her new life.
The Pretty Little Liars AU that everyone (me) has been waiting for!
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Day 2- Orgasm Play by CrowandAngelWings
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
02 Oct 2025
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Summary
Direct stimulation to the pituitary and hypothalamus, utilizing the HPG axis to force orgasms isn't the most conventional way to... bond?... with the newest Lyctor. Good thing Mercymorn isn't trying to *bond* with Harrow
Series
- Part 2 of The Locked Tomb Kinktober 2025
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a little piece of me lives in you by sweetlikesalt
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
01 Oct 2025
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Summary
Mercymorn uses Augustine as a test subject.
TLT Kinktober Day One Prompt: Necromancy
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Who of us is stronger, you’ll just want it more by apredatorywasp
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
01 Oct 2025
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Summary
John and Mercymorn compete to see who can take more dick. Augustine provides the dick. Who will win?
TLT Kinktober 2025 Prompt: Necromancy
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who can kiss away my shit by a_forgotten_dream
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
29 Sep 2025
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Summary
Everything considered, it was a normal night. There was a pulse that thrummed against your ribcage, a relentless pounding in the confines of your chest. Your gaze remained fixed on the plain expanse of wall before you, unwavering despite the Body lingering at the edges of your vision. She's not the only thing haunting you.
Or; You're a necromancer with the misfortune of sleeping next to Ianthe Tridentarius. Nothing happens, which is the perhaps the worst of your problems. Murder attempts included.
Alternatively; A study of Harrow in the Mithraeum, the Body in the Ninth, and the extent of their sins
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Sacrosanct by griddlebutch for Sexyblasphemy
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
24 Sep 2025
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It's not every day you find out your childhood nemesis went to a convent and came back a - holy shit - fully fledged nun. Robes and all. And, because god doesn't hate you enough, she happened to hire the architectural preservation firm you work for to fix up the janky church you both grew up in. Hope this doesn’t awaken anything in you sexually.
Sacrosanctity (n.) the declaration of physical inviolability of a temple, a sacred object, or a person. Something so holy, so sacred, that it becomes absolutely untouchable.