1 - 20 of 600 Works in Mercymorn the First (Locked Tomb Series)
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these walls are my skin by crescent3lu4
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
02 Jun 2026
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For Lyctors, the end is never near. So if you feel particularly keen on romancing the short lobotomized nun sharing your bed, well. You better not hold your breath. Or do it, who knows? You can't die anyways.
Harrowhark is haunted, Ianthe is horny and Mercymorn and Augustine are absolutely not having any of that.
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Beauty is Only Skin Deep by broken_sprinkles, Liquid_Sunshine (broken_sprinkles)
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
31 May 2026
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Harrow was perfect; it was only natural for Gideon to respond in vitrail and follow her like a moth to flame.
Harrow only ever had eyes for bones. Or I just finished the second book and have a fun slight AU where the Reverend Daughter is blind except for seeing bones until she 'gets a new pair of eyes'
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Worlds More Beautiful by vessel_of_calliope
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
27 May 2026
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Gideon and Harrow are childhood friends using their university life to escape from their life spent growing up in a religious commune. Will they get together? (yes) How will they get together? (chapter 1) Will they stay together? (the rest of the fic) What will they think of the epic highs and lows of Canaan U's passionate rivalry with the College of the Blood of Eden that they settle on the basketball court? (read ahead to find out) Will there be cupcakes? (also yes)
Collection of stories from the students at Canaan University. Mainly focused on Gideon/Harrow and their relationship. Semi linear. This is my first time posting on AO3 and I am SCARED. Please feel free to suggest more shenanigans these goobers can get up to in the comments I love taking ideas and suggestions and turning them into fic chapters.
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Behavioral Ecology and Adaptive Strategies of Mammals in the Los Angeles Basin by smogwife
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
26 May 2026
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Harrowhark Nonagesimus has come a long way from her sheltered Mormon upbringing. She's moved to the city, she's out, she has her dream job as a paleontology research associate at her favorite museum, she has friends, she's got a (begrudgingly alright) situationship that hasn't crashed and burned yet.
So why does she still feel like a fraud? And why do her thoughts always, inevitably return to the girl she abandoned more than a decade ago?
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A story in three parts about growing up in high-control environments, missed rites of passage... and also soaking.
Based on a prompt given to me some months ago by godlikeadog.
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Bunny Tomb: The Locked Cruise by Liko_the_Archivist
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir, Bunny Cruise - Felisamos
22 May 2026
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The ultra wealthy need sex toys.
The Lapin-01 needs young women.
09 has a young body, secretive personal guilt, and has condemned herself to a life aboard a black market shadow ship.
Step into the depraved world of modern Earth, where the notable cast of the Locked Tomb series are re-imagined as part of the erotic drama-thriller webcomic Bunny Cruise. In place of Necromancy, Lyctors, and sprawling space empire is the brutal reality of young women victimized by the various ills of society. Driven into a corner and recruited by the enigmatic Cruise with a coercive promise of a small fortune in return for one year aboard. They give up their names and adopt coded numbers, objectifying bunny costumes, and a blanket consent form that subjects them to every whim of the world's wealthiest monsters.
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[Podfic] glassware may be hot to the touch by chryspodfics (chrysalizzm)
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
20 May 2026
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There was a mark on the shoulder of her robe where someone had bitten the epaulet clean off; it explained to distasteful precision the sequins he’d extracted from his teeth in the last hours.
Podfic of glassware may be hot to the touch by transversely.
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october sun by eleventhheart
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
16 May 2026
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The sun was beginning to set, casting the small cafe in a warm yellow light. When Harrow looked at the barista, she immediately believed the sunlight was flowing in for her; she stood behind the counter like an ancient figure carved from marble, all sharp jawlines and well-defined muscles. The golden hour light made her positively radiant. She belonged in a museum, not behind a cash register. Harrow none-so-gently shoved down the instinctual desire to photograph her.
“What can I getcha?”
Harrow cleared her throat awkwardly.
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Photographer Harrow / Barista Gideon AU.
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Lesions in the brain. by bonewennch
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
15 May 2026
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‘ the elevator dinged a final time, the music stopped, finally. and the doors slid open. The world right outside the elevator was uncomfortably bright, barren- with a few scattered pieces of furniture here and there.
Black and white prints of models lined the walls- all dressed simply and with very minimal makeup, and for a fleeting, uncomfortable moment she thought she recognized one of those faces. Harrow bristled at this, and swiftly ignored the wall entirely in hopes she was being delusional.
Gathering herself up, putting on her beloved mask of indifference and vague superiority- Harrow stepped out of the elevator. ‘
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Or, tlt model au.
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Gone A-Tilting by cl_geary
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
05 May 2026
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In the millennial year of our lord--John the Dragonslayer, the undying monarch of Tier and High King of the Nine Forsworn Realms--eight knights converge upon Canaan Castle to represent their respective kingdoms in a tournament. Those who prove themselves worthy shall join the (diminished) ranks of the ageless Dragonslayer Knights. With them, their lieges shall ascend to the High King's court, where they shall have His Majesty's ear for all eternity. Or at least for as long as their knights survive.
Sir Gideon of Drearburh was raised to be a footsoldier, not a knight. She is, however, the closest thing to a knight that the Kingdom of Hadea can muster. Her liege, Princess Harrowhark, wishes to join the High King's court that she might seek aide for her people in their ongoing famine. Sir Gideon never wants to return to Hadea again. If Gideon places well in the games, both their needs shall be served. Unfortunately Sir Gideon can barely ride a horse.
Sir Naberius of Ida, in contrast, is a veteran of the tournament circuit. He is certain to place highly. Or, at least *he* thinks so. And he is quite happy to be forever 23.
Both Gideon and Naberius ought to know by now that magic always comes at a price.
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et maintenant, we drink a bitter wine by waydownhadestown for Moondal
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
04 May 2026
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“What do you want,” said Mercymorn, without turning around.
Augustine struck a match in answer.
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creation of the sun by lesbiansevika
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir, Life is Strange (Video Games 2015 2017 2024 2026)
30 Apr 2026
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The Locked Tomb au starring Gideon and Harrow in modern, Life is Strange style setting where they grew up in an Australian Church before Gideon was casted out for suspected heresy (yes it was actually Harrow). When they reunite after years apart since their childhood, both have hardened in their years apart, Gideon from juvie and Harrow from John Gaius' weird forest cult. Much like the original series, this is veryyyyyy lore-focused, though I do indulge in some freak4freak Griddlehark when I can (they do have priorities)
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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)
28 Apr 2026
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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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Some Other Town, Someone Else's Life by smogwife
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
24 Apr 2026
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"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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dios, ad hoc by callakay_writes
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
23 Apr 2026
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The year is 1349, and the Black Death is running rampant throughout the western world. In a small, decrepit convent in East France, a group of travelers must take shelter for the upcoming months.
Or, the medieval quarantine Canaan House au that no one asked for but I decided to write anyways.
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Dios Apate if it was good by the_boring_distopia
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
09 Apr 2026
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Fancy and Free by ElfieAfterDark
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
30 Mar 2026
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Gideon Nav is the head of HR at her dad's company, and during a retreat she meets a dazzlingly beautiful young woman; then has some fun.
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my homeland is in your eyes by pepper_on_a_kiwi
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
28 Feb 2026
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When Katherine closed her eyes, she could still picture the evisceration. Starting at the styloid process all the way down to the sacrum, this was the path of the knife. Made of bone, sharp and exacting, just the same as the lyctor who wielded it. That was all it took for the light to go out.
How Katherine Deimos became a lyctor and the after effects of it all. Modeled slightly after the Gideon the Ninth ending and the start of Harrow the Ninth.
Series
- Part 3 of Rebirth
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[Podfic] to devour, to change, to become | written by Marenke by Tipsy_Kitty
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
28 Feb 2026
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Maybe that's why Cristabel put matters into her own hands. Maybe she knew, better than all, of Mercymorn's faults, of Mercymorn's hesitations. To take the choice away was to make a choice.
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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
26 Feb 2026
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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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Change your heart or die by overyourhead
Fandoms: The Locked Tomb Series | Gideon the Ninth Series - Tamsyn Muir
21 Feb 2026
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Gideon Nav, this year’s NASCAR rookie, has a whole life plan ahead of her : be a champion. Between a team she does not trust, former winners turned opponents, and PR pressure, she does her best in the worst way possible. What happens when she gets lost in the middle of nowhere, held hostage by a whole town, right before the most important race of her life ?
In which TLT meets Cars (the movie). Gideon has to do community work in the desert. Harrow is a depressed motel owner.
Nothing much to see here… Unless ?