Story cover for The Undercroft. Reader x Sebastiansallow by Dragongoddess171
The Undercroft. Reader x Sebastiansallow
Dragongoddess171
  • WpView
    Reads 1,671
  • WpVote
    Votes 68
  • WpPart
    Parts 56
  • WpHistory
    Time 6h 58m
  • WpView
    Reads 1,671
  • WpVote
    Votes 68
  • WpPart
    Parts 56
  • WpHistory
    Time 6h 58m
Dragongoddess171
Complete, First published Jun 08, 2023
Mature
18fantasyhogwartslegacymature-contentmugglearewelcomepottermoresebastiansallowsebastianxreadertheundercroftwizardingworld
Views 18 years and above this story not hundred percent accurate to the original story line of hogwarts legacy, characters are of age, and the story has taken a massive turn around to its originality please be advised that I am not the best writer or have the great grammar so please be patient 

if you have or know anyone who is at risk of suicide or has suicidal thoughts please seek help from your local health care department or call the suicide hotline. 

If you have any Phobias that include, details of the Deceased have issues with blood or Descriptions of gore I advise against reading this. 

Suicide warnings 
Gore warnings 
Spoils to the game Hogwarts legacy 
Sexual fantasy warning 
And language warning 
 There will not no warning throughout the story of when theses moments will occur so you read at your own risk 

Please enjoy
All Rights Reserved
18fantasyhogwartslegacymature-contentmugglearewelcomepottermoresebastiansallowsebastianxreadertheundercroftwizardingworld
Table of contents

56 parts

Sign up to add The Undercroft. Reader x Sebastiansallow to your library and receive updates
or
Content Guidelines
You may also like
The Heartbreak Prince Sebastian Sallow by Destinychild27
84 parts Complete Mature
It's been a year since I finally defeated Ranrok. I thought I would have everything I ever wanted after the fight was over. But the problem was instead of winning, I lost everything. Sebastian distanced himself from me, Ominis started to stray away, people started to look at me differently. All I want is for Sebastian to notice me and know my secret, know my goals, know me for me. No matter what happens there is only one thing true that nobody will know except for me for now, is that I am completely and utterly in love with him. SPOILER WARNING: Will contain major spoilers from the Hogwarts Legacy game. Will contain mature and explicit scenes, including with violence, romance, mentions of abuse, torture and death. Please read at your own risk! I do not own anything Hogwarts Legacy, Wizarding World or by Warner brothers. All rights to them..... my characters/ story are owned by me. Scenes and occasional quotes taken from the game but I added my own additions.
The Cost of Saving You by pistachio_latte
37 parts Complete Mature
Ancient magic stirs, twisting loyalty, love, and fear into a deadly ritual none of them understand. Sebastian, Ominis, and You must unravel its secrets before it turns their greatest strengths into the very thing that destroys them. No use of Y/N or MC. [Update 11.27.25 - Updated the book cover to fit the gothic Victorian aesthetic] [Update 02.07.26 - Now cross-posted in AO3!] Disclaimer: This is a work of fanfiction inspired by the Harry Potter/Hogwarts Legacy universe. All original characters, settings, and concepts belong to J.K. Rowling and the respective rights holders. This story is purely transformative and non-commercial.
Sub Rosa by moonxcandy
22 parts Ongoing Mature
A story made of vows, duty, old debts, and the quiet war between mercy and guilt. In the Gaunt family, secrecy is an heirloom - and no secret stays buried for long. When they discover Dominique Novell's link to ancient magic, they decide to bind her to their bloodline. A marriage is arranged and for Dominique, the choice is no choice at all. The Gaunts hold leverage - omniscient of Sebastian's sin. To protect him, she signs her name. Now bound by law and silence, she must navigate a marriage written in clauses and consequence - one that blurs the boundary between protection and possession, mercy and guilt, duty and love. ⚠️ Content warnings and disclaimers: - this story contains spoilers for the game Hogwarts Legacy - I do not own the characters, world setting, places and names of the Hogwarts Legacy - and Wizarding World universe - chapters with explicit content will be marked with a 🌶. please consume at your own responsibility - I'm an ESL writer. I do my best proof-reading, but be prepared for possible errors.
Recollection by gdwinslow
23 parts Ongoing Mature
Following an accident at the end of her fifth year, Eliza Stretton was left with amnesia unable to recall the events that occurred in the repository beneath Hogwarts. Having relied on the support of her family and friends to fill in the gaps, Eliza finally feels like everything in her life is falling back into place as she is starting her seventh and final year at the school of witchcraft and wizardry. That is until a mysterious stranger returns making Eliza question everything she thinks she knows. - (OC x Sebastian Sallow) 18+ Content Warning: This story will contain mature themes that can be triggering to some readers. These themes include mature language, violence, blood and injury, death, murder, memory loss, and struggling of mental health including depression, thoughts of self-harm, thoughts of suicide, extreme grief, mentions of family abuse, PTSD, and neglect. This story will also contain bullying, emotional abuse, gaslighting, manipulation, smut (there will be no smut included for any character in this story while they are underage) and heavy family trauma. This story will contain spoilers from the Hogwarts Legacy video game. The storyline from Hogwarts Legacy and all characters and their likeness aside from the main original character, are own by Warner Bros. and Portkey Games, All Rights Reserved. The main character, Eliza Stretton, The Stretton family, and the additional story elements not mentioned in the video game are owned by myself. I do not give permission for this story to be posted anywhere else without my permission
The Badger and the Snake: A Sebastian Sallow x reader by madhigs
47 parts Complete Mature
As the reader a hufflepuff and Sebastian try to understand and navigate new found feelings for each other that grow in intensity. Sebastian also struggled to suppress a dark side of himself that he unleashed his 5th year. It revolves around 2 POVS. You as the reader and inside Sebastians head as well. It does have very heavy spicy moments but also fluff as well. Its story based and my Interpretation of future evens following the game and Sebastians quest line. This story line takes place in 7th year of Hogwarts legacy 2 years after the battle with ranrok to be able to age up characters as well as to not have to retell the game. (Clearly we chose not to turn him in since he is not expelled.) though you all still worry what he is capable of. *TRIGGER WARNINGS* Detailed sexual content Abandonment Teen Pregnancy scare This is my first go at fan fiction but I truly love creative writing. I will put warnings at the top of pages containing explicit content. Thank you everyone enjoy I can't wait for feedback ❤️
Run Away ✧ Hogwarts Legacy by errorcode360
71 parts Complete Mature
𝒹𝓊𝑜𝓁𝑜𝑔𝓎: 𝓇𝓊𝓃 𝒶𝓌𝒶𝓎 & 𝓈𝓉𝒶𝓎 𝒶𝓌𝒶𝓎 After Sebastian Sallow was possessed by the relic's demon everything changed. Two years later Antheia is torn between her new life vowing to protect Ancient Magic as a Keeper with her new lover and her old desires to save the boy she never stopped loving. Old emotions threatened to be rekindled. What is more powerful, duty or desire? Okay, now for the unserious summary: Sebastian got sent to Azkaban because it turned out there was a reason the relic made him so moody in the game (got possessed by blood magic and now there is a voice inside his head). FMC finally recovered from the situationship with Sebastian, she now has a boyfriend that she began seeing after the events of Fifth Year. Spoiler, he is not evil and is actually a good person! However, FMC isn't the only person that might have feelings toward them. This is a messy emotional story about how everything works out in the end despite the heartbreak. Common Tropes: Right People Wrong Time Love Triangle - two of them technically Enemies-to-lovers (ish) LGBT+ themes Sobriety & Substances issues Please note, that there is NO CHEATING TROPE in this story. For story notes regarding 𝓈𝓉𝒶𝓎 𝒶𝓌𝒶𝓎 see the Author's Note as it will contain spoilers for the first story ♡ -✧-✧-✧- *Sexual conduct chapters are marked: Sebastian Sallow x OC Gryffindor Female OC Gryffindor Female x OC Ravenclaw Male Ominis Gaunt x OC Ravenclaw Male General trigger warning themes throughout the story will include violence, death, and sexual conduct. Trigger warnings will be included at the beginning of chapters with a full description in the comments to expand upon the specific details of each chapter. Please note that some points are unclear or implied for plot purposes, but suggested in the trigger warnings to not be overlooked. If anything is missed, please don't hesitate
The Secrets || Sebastian Sallow POV fanfic by misspurrple
31 parts Ongoing
The world thinks I'm the arrogant one. The rule-breaker. The charming duelist who gets away with everything. They're not wrong. But no one knows what's at stake when I look at Anne. No one knows what I've done. What I'll still do. I made a promise. One I intend to keep. Not for the Headmaster. Not for the school. Not even for the girl with the violet eyes and the clever mouth who's stumbled straight into my path. Qynna Veilinharv. She wasn't here before. Now she's exactly where I need her. She casts spells like she's never learned them, argues like a Slytherin, blushes like a Hufflepuff, and hides things like the world depends on it. I should have left her alone. I didn't. She keeps walking straight into my plans, and every time she does, it becomes easier to let her. The closer she gets, the more I can see what she's made of. And the truth is, some part of me likes watching her try. Even if she never realises how deep she's wandered. Even if, by the time she does, it's already too late. Includes: ✨ Secrets, lies, and very bad decisions ✨ A meddling, mysterious girl with more power than she knows ✨ A cocky protagonist who absolutely has a fan club ✨ A slow descent into dark magic Sebastian Sallow x Fem!OC (but replace "Qynna" and "Veilinharv" with your own OC if you wish- we're all secretly shifting anyway.) ⚠️ Trigger Warnings This story includes themes of grief, terminal illness, death, PTSD, anxiety, depression, obsession, self-harm, light intimacy, violence, blood, dark magic, alcoholism, and emotional ruin. Spoilers for Hogwarts Legacy throughout. Game scenes may appear with new context, expanded dialogue, or darker consequences. Leave comments, theories, chaos, pain. I read them all like they're letters from Azkaban. Thank you for being here. And good luck. You'll need it. - misspurrple
In the shadows of Blood and Snakes [Sebastian Sallow x Gryffindor MC] by fire11foxy
45 parts Ongoing Mature
Hogwarts Legacy Fanfiction (post game-events). 6h year, characters are aged up to 18+, multiple POVs *** The battle at Hogwarts was just the beginning. With ancient magic coursing through her veins, Adeen Oakley faces a world that hungers for her power. But when a peculiar Auror arrives at Hogwarts to investigate a shocking murder, the lines between ally and enemy blur. Adeen becomes the centerpiece of a game played by a mastermind, who seeks to exploit her magic and manipulate the lives of those closest to her. For Sebastian, the weight of guilt and love forces him into impossible choices, while Ominis fights to protect his friends, even as he's pulled into his family's dark legacy. With love threatened by lies, and magic twisted into power's cruelest weapon, the trio must confront enemies within and without. As secrets from their pasts collide and their deepest fears come to life, can Adeen and her friends resist the pull of the darkness threatening to consume them? Or will their bonds shatter under the weight of betrayal? *** ⚠️ contains major Hogwarts Legacy spoilers! *** ✅ slow burn ✅ idiots in love ✅ friends to lovers ✅ enemies to lovers ✅ betrayal ✅ found family ✅ murder mystery ...and more: Gaunt Family lore, Sebastian's past, MC's past, Pure-blood supremacy, social pyramid, 'who did this to you?', injury, magical artifacts, masquerade ball, dark rituals, magic outbursts. *** ‼️TW: graphic depictions of violence, sexuality, strong language, PTSD, panic attacks, abuse, incest, grief, death. *** All characters aside from Adeen and others that are not present in HL, are owned, created and trademarked by Warner Bros, Portkey Games, the Wizarding World, etc... (rights to them). The story and the other original characters and their 'lore' are owned by me. Some scenes and lines are taken right from the game, but with my own additions. *** 18.09.2024 - 1st in sebastiansallowxoc
No Choice But You // Ominis Gaunt x Reader by c0nfring0
51 parts Complete Mature
HOGWARTS LEGACY SPOILERS AHEAD!! Ominis x Reader fanfiction is based in their seventh year. All characters have been aged up to 18 years of age where explicit content is involved. Written from the perspective of fem Slytherin y/n. ---------- Sebastian has been sent to Azkaban. Of course, Ominis blames you--it's only natural after everything that happened in your fifth year. For the entirety of your sixth year, Sebastian was at Azkaban. While Ominis understood that it was a necessary action to take considering what Sebastian did, he didn't forget that you encouraged it, or that you partook in the dark arts yourself. It was against everything he stood for. He warned you every step of the way, and neither you nor Sebastian listened to his warnings. By a stroke of luck, the ministry has decided to give Sebastian a second chance. He gets to come back to Hogwarts for his seventh year of schooling. Ominis is still Sebastian's friend, but he wants to keep you away from him at all costs. He hates you for what you did to his best friend. On a happy note, St. Mungos finally found a cure for Anne Sallow's curse, and she's back at Hogwarts for her seventh year as well. Your friendship with her blossoms, and makes it even harder for Ominis to stay away from you. Even though he hates you, he can't deny the attraction between the two of you. Everything changed one night at a party in the Slytherin common room when you two come in close contact. But can he fight his feelings and stay away from you? ---------- TRIGGER WARNINGS: Sexual Content: 5/10 Mental Illnesses: 7/10 Violence: 3/10 Self Harm: 6/10
The Light in the Dark | Neville Longbottom by h0efortheharries
119 parts Complete Mature
"𝐓𝐡𝐞 𝐰𝐨𝐫𝐥𝐝 𝐢𝐬𝐧'𝐭 𝐬𝐩𝐥𝐢𝐭 𝐢𝐧𝐭𝐨 𝐠𝐨𝐨𝐝 𝐩𝐞𝐨𝐩𝐥𝐞 𝐚𝐧𝐝 𝐝𝐞𝐚𝐭𝐡𝐞𝐚𝐭𝐞𝐫𝐬. 𝐖𝐞'𝐯𝐞 𝐚𝐥𝐥 𝐠𝐨𝐭 𝐛𝐨𝐭𝐡 𝐥𝐢𝐠𝐡𝐭 𝐚𝐧𝐝 𝐝𝐚𝐫𝐤 𝐢𝐧𝐬𝐢𝐝𝐞 𝐨𝐟 𝐮𝐬. 𝐖𝐡𝐚𝐭 𝐦𝐚𝐭𝐭𝐞𝐫𝐬 𝐢𝐬 𝐭𝐡𝐞 𝐩𝐚𝐫𝐭 𝐰𝐞 𝐜𝐡𝐨𝐨𝐬𝐞 𝐭𝐨 𝐚𝐜𝐭 𝐨𝐧. 𝐓𝐡𝐚𝐭'𝐬 𝐰𝐡𝐨 𝐰𝐞 𝐫𝐞𝐚𝐥𝐥𝐲 𝐚𝐫𝐞." ☾ ⋆*･ﾟ:⋆*･ﾟ:⠀ *⋆.*:･ﾟ .: ⋆*･ﾟ: .⋆ Dawn Malfoy was just like every other wizard her age. She grew up in a normal home with a normal family, was well-liked by her peers, and received good marks in school. One would've described Dawn's life as perfect until the end of her fourth year. That one tragic accident marked the beginning of her demise... when her life changed forever. ☾ ⋆*･ﾟ:⋆*･ﾟ:⠀ *⋆.*:･ﾟ .: ⋆*･ﾟ: .⋆ This is a Neville Longbottom x OC story (although most of the story doesn't revolve around their relationship) THIS STORY IS RATED MATURE FOR A REASON! CWs (Content Warnings) and Disclaimers are placed at the beginning of each chapter for reader discretion. Please do not read if you are uncomfortable with... → Violent Acts & Descriptions → Sexual Content (Consensual & Nonconsensual) → Emotional & Physical Abuse → Suicide → Death ☾ ⋆*･ﾟ:⋆*･ﾟ:⠀ *⋆.*:･ﾟ .: ⋆*･ﾟ: .⋆ Started: 10/23/20 Finished: 12/14/23
You may also like
Slide 1 of 10
The Heartbreak Prince Sebastian Sallow cover
The Cost of Saving You cover
Sub Rosa cover
Recollection cover
The Badger and the Snake: A Sebastian Sallow x reader cover
Run Away ✧ Hogwarts Legacy cover
The Secrets || Sebastian Sallow POV fanfic cover
In the shadows of Blood and Snakes [Sebastian Sallow x Gryffindor MC] cover
No Choice But You // Ominis Gaunt x Reader cover
The Light in the Dark | Neville Longbottom cover

The Heartbreak Prince Sebastian Sallow

84 parts Complete Mature

It's been a year since I finally defeated Ranrok. I thought I would have everything I ever wanted after the fight was over. But the problem was instead of winning, I lost everything. Sebastian distanced himself from me, Ominis started to stray away, people started to look at me differently. All I want is for Sebastian to notice me and know my secret, know my goals, know me for me. No matter what happens there is only one thing true that nobody will know except for me for now, is that I am completely and utterly in love with him. SPOILER WARNING: Will contain major spoilers from the Hogwarts Legacy game. Will contain mature and explicit scenes, including with violence, romance, mentions of abuse, torture and death. Please read at your own risk! I do not own anything Hogwarts Legacy, Wizarding World or by Warner brothers. All rights to them..... my characters/ story are owned by me. Scenes and occasional quotes taken from the game but I added my own additions.

More details