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Summoned (Nightmare!Sans x Reader) by SkellieUser666
Fandoms: Undertale (Video Game), Dreamtale - Fandom
16 Dec 2025
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Summary
(Y/N) didn't want to be friend the popular kids. Nor had she ever dreamed that she would have a sleepover with them. But boy is she wrong when she is forced to go with the popular girls for a one night sleepover.
But what (Y/N) doesn't know. Is that her life will change in that very night.
"Well well well, look what we have here."
Cover by: @ scryl.studio on Instagram
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Summary
Nightmare’s body stopped growing centuries ago.
His illusion shattered in one battle.
Now the multiverse knows what he is.The Bad Sanses aren’t taking it well.
(This is my first time writing a fic like this, so I’m just hoping it comes out okay)
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Bill Sans, also known as Cipher, doesn't take loss well.
The multiverse was destroyed once.
It will happen again.
And this time...Ink won't get free.
Series
- Part 1 of Vengeance and Pain | Song Fics
- Language:
- English
- Words:
- 1,773
- Chapters:
- 1/?
- Kudos:
- 5
- Hits:
- 63
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Summary
Warning: Heavy sadism, abuse, manipulation, trauma and self harm topics.
Nightmare is living the life. He's got a castle, power, whatever he wants when he wants it. Even if he's got a little ghostly stalker following him.
Unfortunately, his enemies are teaming up, and he can't do everything alone anymore.
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What if when the villagers drove Nightmare to eat the apple. Dream wasn't there? What if the villagers were using Dream and manipulative. So when Nightmare goes through the village, killing everyone... he finds Dream in a situation that makes him realize something different.
Series
- Part 5 of Undertale AU one shots
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You find out through a friend that your fiance has been cheating on you. After dumping everything he owns on the driveway (and maybe setting it on fire) you decide to take a walk to clear your head and end up in a situation you probably should be a little more concerned about than you are.
Series
- Part 1 of Mr. Steal Your Girl
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Dust comes to the library late at night and asks Nightmare not to leave him alone. Nightmare stays with him until sleep settles the loud memories.
[Novembmare - Day 17: Favour]
Series
- Part 85 of Undertale Fics
- Part 95 of One-Shots / Two-Shots / Three-shots
- Part 32 of Prompt Fics
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Summary
When Killer feels the urge to drink again, he does something he’s never done before, he goes straight to Nightmare and asks him to take the bottle away.
[Novembmare - Day 16: Alcohol]
Series
- Part 84 of Undertale Fics
- Part 94 of One-Shots / Two-Shots / Three-shots
- Part 31 of Prompt Fics
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in your arms (with me) by Loafacats for Evans_Multiverse
Fandoms: Undertale (Video Game)
11 Nov 2025
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Summary
dustmare fluff. literally just dustmare fluff. 👍👍
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When someone insults Cross, Nightmare steps in, not with anger, but with calm, precise protection. Horror, Killer, and Dust back him up, their loyalty fierce and unyielding. Family isn’t about perfection, it’s about keeping each other safe.
[Novembmare - Day 11: Family]
Series
- Part 79 of Undertale Fics
- Part 89 of One-Shots / Two-Shots / Three-shots
- Part 27 of Prompt Fics
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Killer asks a question he pretends is a joke: What would you do if I disappeared?
Nightmare answers honestly.[Novembmare - Day 10: Truth]
Series
- Part 77 of Undertale Fics
- Part 86 of One-Shots / Two-Shots / Three-shots
- Part 25 of Prompt Fics
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Nightmare enters a universe that has gone completely silent, no souls, no survivors, nothing left but freshly settled snow and a crushing wave of negativity unlike anything he has ever sensed.
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Exhausted, shaking, his soul hovering outside his body and warped into the shape of a target, Killer is the last living thing in a world he destroyed with his own hands.
[Novembmare - Day 7: Target]
Series
- Part 73 of Undertale Fics
- Part 83 of One-Shots / Two-Shots / Three-shots
- Part 21 of Prompt Fics
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Summary
When Dust’s LV burns too high, it takes time to come down again.
Nightmare knows better than to push, so he stays, reads, and lets the firelight do the rest.[Novembmare - Day 6: Poem]
Series
- Part 72 of Undertale Fics
- Part 82 of One-Shots / Two-Shots / Three-shots
- Part 20 of Prompt Fics
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Summary
When Killer’s voice gives out, the castle falls still. Nightmare brews tea.
[Novembmare - Day 3: Tea]
Series
- Part 69 of Undertale Fics
- Part 79 of One-Shots / Two-Shots / Three-shots
- Part 17 of Prompt Fics
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A Teenager’s Guide to Accidentally Becoming a Monster (What do you mean im the end of the World???) by Fyodor_Kinnie
Fandoms: Undertale (Video Game)
02 Nov 2025
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Summary
A fourteen-year-old dies. Somehow, he wakes up in a gothic castle… in the body of Nightmare Sans. Pale skin, glowing eye, dramatic frills, tendrils that might be alive, and a permanent “I feel miserable” vibe—basically a deluxe, broody skeleton package he definitely didn’t order.
Now he has to survive bad timelines, chaotic skeletons, and his own very confused soul while looking intimidating and not dying… again. Chaos, brooding, accidental gothic flair, and very little actual self-control ensue
Series
- Part 1 of Sans aus for the win! :D
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The Magnificent Sans' Guide to Serving Your New Evil Boss by luckyfinch
Fandoms: Undertale (Video Game)
22 Oct 2025
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Summary
Swap gets fed up one day and declares that he's going to go work for Nightmare instead.
Ink and Dream didn't think he was serious.
or: the one where Swap (in a last-ditch-effort to get away from Ink & Dream) turns to villainy!!!… unfortunately, his new evil friends seem to insist on making him do annoying things like “eat daily meals” or “sleep.”
[SLOW UPDATES]
Series
- Part 2 of Swap’s Magnificent Evil Guide
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”The fuck do they mean ‘Sell you’? What the hell?” Killer snapped, his soul twisting in his mounting agitation. Horror growled low, eyesockets narrowed while Nightmare and Error trembled with rage. It’s Dust that puts the pieces together and asks the dreaded question.
“Cross…were you a child bride?”
The question hangs heavy in the air, no one daring to even breathe. Nightmare and Error are hoping beyond hope that Cross will denying it, that their youngest hasn’t been subjected to such atrocities. Their souls break when Cross gives a small miserable nod.
Series
- Part 21 of Nightmare’s gang as a family drabbles
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Summary
Killer had his babybones, Crescent, very recently. This seemed to have just amplified his own selves instincts up to 100.
But,when Dream eats a negative apple,band becomes shattered..
Nightmare had changed too..
Passive didn't remember him. Passive was never him.
He attempts to join shattered, to keep his child safe. But shattered didn't want to risk killer's life.
So he advised killer to leave this multiverse, and find a safer one. For his and his child's sake.
He travels and finds many, many multiverses that wouldn't take him..or his child.
But, when he accidentally falls into a portal, leading to a nightmare variants home...
Will he find himself a home there?
Or will he and his child have to keep looking?
Series
- Part 1 of Multiversal chaos:)
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Summary
Without warning, without reason, nor explanation, you (yes, you), woke up as Dream from Dreamtale. And of course, you remember everything that is supposed to happen in this world. With a knowledge that no one else possesses, you must do your best to take care of your new brother, Nightmare, while changing the fate of not only this world, but the multiverse itself.
Do you miss home? Maybe. But there's nothing you can do about it now. Instead, you must throw yourself face first into saving this world.
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I was 13 years old when I first wrote the original DaLDoM fic and it SHOWS. Now that I've been cursed into hyperfixating on Undertale AU's again, one of the main things I've wanted to do for so long is rewrite this fic, and the time has finally come! Don't expect any of the OC's that showed up in the original fic, the main focus will mainly be on Dream and Nightmare.
Series
- Part 2 of A Little Light
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Summary
Dream revirava seu sótão.
Porque revirava seu sótão?Em meio de tantas boas lembranças com Nightmare algo no fundo da existência fala que tudo que foi vivido valeu a pena.
Sim, boas memórias valem a pena..._________________________________________
Essa é uma história sobre o Dream e Nightmare lembrando de boas coisas do passado.
- Language:
- Português brasileiro
- Words:
- 1,365
- Chapters:
- 1/1
- Kudos:
- 5
- Hits:
- 44