Undertale a New Monster is He...

Da Why_Is_It_Spicy

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Y/N was just your normal every day monster in the underground, well. That's what he thought at least before m... Altro

bio(updated a small bit)
chapter 1: meeting the new monster(rewritten)
chapter 2: meeting the human(rewritten)
chapter 3: Waterfall and a gray door(rewritten)
chapter 4: meeting undyne...(rewritten)
chapter 5: meeting the heroine...again(rewritten)
chapter 6: fighting the heroine
chapter 7: a dream? and the hangout
chapter 8: a laboratory and a ghost
chapter 9: the resort and the CORE...
chapter 10: judgement and the king
chapter 11: the true laboratory
chapter 12: the final boss...
chapter 13: revival...
chapter 14: the surface
a heads up for next chapter
T̶̫̥͒̌h̴̝̳͝è̴͎̬ ̷͔̎̏G̷̯͚̊e̵̹̮̎̆n̸̢̚ȯ̶̧͒ͅc̸̙̈̔ị̶̘̉d̶̰͗ě̴̬̜
thank you
chapter 15: unexpected guests part 1
New Bio
chapter 16: unexpected guests part 2
chapter 17: unexpected guests part 3
chapter 18: unexpected guests part 4
A/N
writers block
ChibiTale is out
chapter 19: the under what?
chapter 20: The warning and the AUs
not a chapter
Chapter 21: The X-Event
Chapter 22: Underswap
Chapter 23: A Shocking Revelation
Chapter 24: An Unknown Power
Chapter 25: Aftermath
CF: Merry Christmas
Happy New Year (A/N)
"XI File"
Chapter 26: Invasion
Chapter 27: A New Challenger Has Appeared
Chapter 28: The Truth
Chapter 29: Fatal_Crash
A/N
Reaction Time!
RT: Overtale
RT: Insomniac
RT: An Enigmatic Power

RT: Underswap

79 1 0
Da Why_Is_It_Spicy

We see a familiar looking skeleton tying a blue scarf around their neck, putting on a pair of blue gloves on their hands, dressing on with some black shorts, a white T-Shirt with yellow outlines on the sleeves, and blue boots. This was Swap

Swap:" MWEHEHEHE! Time to go out and catch a human! " He said as he runs out of his room

The UT cast(-Sans) were greatly surprised at this counterpart of Sans behavior

Papyrus:" IS THAT SANS? IT FEELS REALLY WEIRD WATCHING HIM NOT BEING LAZY, FOR ONCE... " He said

Author:" I mean, I did say all of yalls roles were reversed. So... That also means the ages and personalities are also reversed. "
Undyne:" Wait... Does that mean Papyrus in this AU is... As lazy as Sans, now? "She asked, making Papyrus gasp

Papyrus:" OH, GOD! PLEASE NO! " He exclaimed

Sans:" What's wrong, bro? Is my laziness that bad? " He said

Papyrus:" REMEMBER THAT SOCK THAT YOU DIDN'T PICK UP FOR THE LAST THREE MONTHS IN SNOWDIN? "

Sans:" Uh... Yeah, why do ya ask? "

Papyrus:" IT'S STILL THERE!!! IT HAS BEEN A YEAR, SANS!! SO, WHEN WE GET BACK. PICK UP YOUR SOCK!!! " He yelled

Sans:" Ok. "

We see Swap running down the stairs and going to the couch, as he goes there he notices someone sitting there and drinking coffee

Swap:" Oh hey, Gaster! " He greeted

Gaster:" Hmmm? Oh, hello there blue. " He greeted back

Gaster was confused, puzzled, and perplexed. He was wondering on how or why is he there, still alive in that AU. Then he realized it

Gaster:'✋︎☞︎ ❄︎☟︎✋︎💧︎ ✋︎💧︎ ✌︎☠︎ ✌︎☹︎❄︎☜︎☼︎☠︎✌︎❄︎☜︎ 🕆︎☠︎✋︎✞︎☜︎☼︎💧︎☜︎ 🕈︎☟︎☜︎☼︎☜︎ ✌︎☹︎☹︎ ⚐︎☞︎ ⚐︎🕆︎☼︎ ☼︎⚐︎☹︎☜︎💧︎ 🕈︎☜︎☼︎☜︎ ☼︎☜︎✞︎☜︎☼︎💧︎☜︎👎︎📬︎📬︎📬︎ ❄︎☟︎☜︎☠︎ ❄︎☟︎✌︎❄︎ 💣︎☜︎✌︎☠︎💧︎ ✡︎📭︎☠︎ ✋︎💧︎📬︎📬︎📬︎ ⚐︎☟︎📪︎ ☠︎⚐︎📬︎📬︎📬︎( IF THIS IS AN ALTERNATE UNIVERSE WHERE ALL OF OUR ROLES WERE REVERSED... THEN THAT MEANS Y/N IS... OH, NO... ) ' He thought as realization struck him

XGaster:' ☟︎❍︎❍︎❍︎📬︎📬︎📬︎ ✋︎■︎⧫︎♏︎❒︎♏︎⬧︎⧫︎♓︎■︎♑︎📬︎ ✋︎⧫︎ ⬧︎♏︎♏︎❍︎⬧︎ ⧫︎♒︎♋︎⧫︎ 😐︎♓︎❒︎⍓︎◆︎🕯︎⬧︎ ♍︎□︎◆︎■︎⧫︎♏︎❒︎◻︎♋︎❒︎⧫︎ ♓︎⬧︎ ♓︎■︎ ⧫︎♒︎♏︎ ♎︎♋︎❒︎🙵 ❖︎□︎♓︎♎︎📬︎📬︎📬︎(Hmmm... Interesting. It seems that Kiryu's counterpart is in the dark void...) ' He thought

The UT cast were confused. The man, the man in the same room as them is in one of these videos. They wonder on who is that, and why he gives off a sense of familiarity

Swap:" Have you seen paps? We were supposed to be on lookout yesterday, so... " He said, he slightly groans

Gaster takes a sip of his coffee

Gaster:" Well he did say he was going to his station in hotland... But that was a few hours ago, so I'm unsure where his exact location is. " He said as he takes a swig of his coffee

Swap groans and runs out of the door, Gaster lightly chuckles before noticing his mug is now empty

Gaster:" Hmmm... I guess it's time for me to go. " He said to himself, he then puts the mug on the table

Gaster:' Hmmm... A little stroll in water fall wouldn't hurt...' He thought, he then gets up

He goes outside and grabs his jacket from a coat hanger, and goes outside. When he gets outside he is immediately met with the cold breeze of Snowdin, he wears his jacket and walks to waterfall

As he was walking, he notices two different figures in the distance. He immediately recognizes them

Swap:" COME ON, PAPS!! WE NEED TO BE READY WHEN A HUMAN ARRIVES! " He shouted, Papyrus just puffed another smoke from his cigar

Papyrus:" YEAH, YEAH... COME ON, SANS. JUST RELAX FOR A FEW MOMENTS, AND JUST TAKE IN THE VIEW OF WATERFALL. ITS GONNA BE A WHILE BEFORE ANOTHER HUMAN SHOWS UP. " He said, getting a groan from him

Undyne:" Wow... So, Papyrus smokes in this AU... That's really not like him. " She said, getting a nod from him

Papyrus:" AND I THOUGHT I WAS SUPPOSED TO BE LIKE SANS... YET THAT OTHER ME DOES ACT LIKE HIM, BUT I DON'T UNDERSTAND... WHY DO I SMOKE? " He said, I shrug

Author:" Dunno, but I think it's in the lines of something like ' wanting to be cool and edgy ' something like that. "

Swap:" But paps! " He whined, he then notices Gaster

Swap:" Oh, hi there Gaster! " He greeted

Papyrus:" Heya, G. " He greeted lazily

Gaster:" Hello there you two... " He greeted back

Papyrus:" So, what brings you here? " He asked

Gaster:" Im here to take a small detour, and go to hotlands to check up on the labs. " He said

Papyrus:" CANT YOU JUST... I DUNNO... TELEPORT? " He said, a little bit confused

Gaster:" Like i said, I'm here to take a small detour. Preferably just to stroll around waterfall. " He said, getting a hum of understanding from him

Swap:" Okay, then! Good luck with your travels, Gaster! And stay safe! " He enthusiastically said, getting a chuckle from him

Gaster:" Don't worry, i will. " He said, he then walks off

~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-
A Few Hours Later...
~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-

Nothing much happened during Gasters stroll. He met a few monsters, greeted them, listened to some echo flowers, and just walked

He then arrives at his destination. The Laboratory, where the current Royal scientist resides in. He knocks on the door, to only hear somebody trip and fall on the floor while hearing some vials smashing on the ground

The door opens to a disheveled Undyne, she slightly freaks out

Undyne:" O-oh no! I- uh, I can-uh e-explain w-w-whats happening- uh h-here. " She said, fumbling over her words

Undyne:" ... WHAT THE FU- "

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𝚆𝚎'𝚕𝚕 𝚋𝚎 𝚛𝚒𝚐𝚑𝚝 𝚋𝚊𝚌𝚔 𝚊𝚏𝚝𝚎𝚛 𝚝𝚑𝚒𝚜 𝚜𝚑𝚘𝚛𝚝 𝚋𝚛𝚎𝚊𝚔

(𝙲𝚘𝚞𝚕𝚍𝚗'𝚝 𝚛𝚎𝚜𝚒𝚜𝚝 𝚒𝚝, 𝚜𝚘𝚛𝚛𝚢)
~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-

After Undyne had calmed down and went Back to her seat, the video continues

As she becomes a stuttering mess, Gaster stares at her awkwardly

Gaster:" Uh... Undyne...? Undyne. Undyne! " He said, slightly raising his voice

Undyne immediately stops and starts to sweat nervously, she starts fidgeting with her fingers

Gaster:" Alright. Now that I have your attention, what exactly happened in there? " He questioned, seeing the large mess behind her

Undyne:" I... Uh... M-may or may not h-have a... Tinkered... With the prototypes... " She nervously said, Gaster facepalms

Gaster:"*sigh* Undyne. While you may be the current Royal scientist, that does NOT mean you can tinker with my creations. " He said, giving Undyne a stern look

Undyne audibly gulps at his gaze, his look slowly softens before sighing again

Gaster:" Atleast let me know if you want to know more about those prototypes... They are no where near close to completion. " He said, she nervously chuckles

Undyne:" S-so, uh... W-what brings you here? Dr. Gaster? " She asks, still nervous

Gaster:" I am here to check on the Laboratory... But seeing things currently... " He said as he sees a fire going on in the lab

Gaster:" ... I have a feeling that I will be here for quite sometime..." He said with a sigh

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A Few Hours Later...
~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-

After putting out the fire and cleaning out the mess that was made, Gaster then returns to snowdin. He then goes to his room and lays down, already tired with today's activities and he sleeps

The screen fades into black

Undyne:" Was that seriously all? " She asks while looking at me

Author:" Nope. There's still a few more, I think. Let's get started with this one. "

Author:" Alright. This one still happens in the same AU, but... This takes place in the past where... The incident began. "

Alphys:" Umm... W-what incident? " She asks, a bit confused

Author:" Well... The incident where a particular monster fell into the CORE. "

Alphys:" ...What...? W-wait! I think there used to be a report w-where someone fell in... B-but that was years ago! " She exclaimed " A-and their soul would cease to e-exist when it was converted into magic... " She said, feeling sympathy for the one that fell in

Asgore:" Alphys. Didn't you say that whoever falls into the CORE will be lost and forgotten, forever? " He questioned, she now has a conflicted look

Alphys:" T-that was only a theory! I-I didn't know if it was t-true! " She exclaimed

Author:" Eh, let's just watch the video. "

The screen brights up

We hear footsteps, heavy footsteps to be precise. Conversations could be heard throughout the room but it was silenced by a large black silhouette coming into the room. Their blue glowing eyes pierced throughout the room

???:" Break time, is over. " They announced, the monsters inside stood up and went outside

??? Steps aside and let's them through. They then go with them

The UT cast were obviously confused, so we're the XTale cast. Currently, only the Gasters knew who it was.

As the large silhouette walks into an elevator, the light shines on them to reveal Y/N in a lab coat, he was also wearing a pair of glasses

The UT cast were more confused. They knew that he couldn't be the swapped version of Alphys, since they knew it was Undyne. They all wonder in thought on who was he swapped with

Alphys notices something

Alphys:" Wait... A-are those scars...!? " She quietly exclaimed

As the elevator comes to a stop. He walks up into another elevator, but this time the eleveator went down and went right, saving a bit of time before the elevator opens and he walks out

He gets to a house and knocks, footsteps could be heard from the other side. The door opens to reveal Asgore, in his casual clothing

Asgore:" Howdy! What brings you here, Y/N? " He asks

Y/N:" Hello, King Asgore. I am here to check on the little skeleton. " He said with a smile

Asgore:" Oh, come right in! " He said, as he let's him in

When Y/N enters, he immediately notices three children playing in the living room. One human and two monsters

When they were playing, one of them fell down and face planted. Y/N already got there and kneels closer to the child

Y/N:" Are you alright? Prince Asriel? " He asks with concern

The kid just smiled, having already experienced this a thousand times

Asriel:" Yup! I'm fine! " He said with a smile

He chuckles, he then feels two small weights on his sides. He sees that both Frisk and the small skeleton hugging him by his side, both were happy that he was there. He smiles

Y/N chuckles before patting both of their heads, that includes Asriel. He then stands up

???:" Y'know... He has been very happy since you brought him here... Asriel and Frisk loves playing with him. " Someone said

He looks at the direction where the voice came from to see had it was Toriel. He smiles

Y/N:" Hello there, Queen Toriel. " He greeted, she giggles

Toriel:" Oh drop the formalities, Y/N. You are our old friend! " She said, he chuckles

Y/N:" Well it doesn't help that I am practically still in my 'youthful' days. " He said, getting a laugh from the two

Asgore:" Oh come on, Y/N! We're practically also in our 'youthful ' days, too! " He said, getting a laugh from the two

The room was soon silent when Y/N's phone began to ring. He picks it up

Y/N:" Hello? Y/N here... Yes, why do you ask?... Hmmm... What...? " He then hung up the phone and sighs

Asgore:" What's wrong? Did something bad happened? " He asks with concern

Y/N:"*sigh* No... It's the CORE. The systems are having problems and it seems I'm the only one that can fix it. " He explained

Toriel:" Can't someone else do it instead? " She questioned, a long sigh could be heard from him

Y/N:"... No... The system of the CORE is mostly made of complex coding, and mostly based off of conduction and conversion, in which for some reason I...  Seem to only understand... " He explained

Asgore:" I see... Then goodluck, my friend. Stay safe while your in there. " He said

Y/N:" I will... " He said, he then feels a tug on his coat

He looks down to see it was the little skeleton. He kneels closer to him

Y/N:" What is it? Little one? "

???:" ... Will... You return...? " He said, a bit shy

Y/N smiles and pats his head

Y/N:" Of course I will. " He said, he then gets up and takes his leave

Gaster felt very weird seeing his younger self, especially being patted by a monster that he created in which he calls his son. XGaster watches in amusement, seeing Gasters confusion

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A Few Hours Later...
~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-

We see Y/N typing on a familiar screen, most of the words were typed with symbols. He then stops and rubs his temples, he is currently experiencing a mild headache

He realeases a long, tired sigh

Y/N:"... Another day, another headache for the Doctor... " He grumbled " I need coffee... " He muttered

He then goes to a coffee maker, he grabs a bag labeled 'Golden Coffee' and pours some in the chamber. The beans get grounded up and a steady stream of liquefied coffee comes out of the decanter lid, he then grabs his mug and decides to go up

When he arrives to his destination, he leans on the railings of the CORE while taking a swig of his coffee. He is now satisfied with his beverage

Y/N:' I wonder how's he doing... ' He thought, he then notices a few steam bursts from one of the pipes

Y/N:" No wonder why I couldn't find anything wrong on the system... I should probably go call someone to fix that... " He mumbled

Before he could, the railings suddenly break off. And then...

The UT cast watches in horror as they see Y/N fall off the CORE and fall into the smoldering lava below. The XTale cast had no reaction once however

As Y/N was being covered in lava, he feels his entire body dissapearing. He struggles but he finds it futile as his limbs were already gone

Y/N:' DAMMIT...! I'm so sorry... Son... That I... Couldn't witness you grow... ' Was his last thoughts before dissapearing into nothing

The UT cast were a bit confused, but were shocked nonetheless. They now realized who the man was

Alphys:" D-Dr. G-Gaster!? " She exclaimed

Gaster:" ł₮ ₴ɆɆ₥₴ ɎØɄ ₳ⱠⱠ ₣ł₦₳ⱠⱠɎ ⱤɆ₥Ɇ₥฿ɆⱤ ₥Ɇ... " He said with his voice being heavily distorted and glitched

Gaster:" ₣øɽ₲łvɇ ₥ɇ ł₣ Ł ₴øʉ₦đ ⱨɇ₳vłⱡɏ đł₴₮øɽ₮ɇđ, ł₮ ł₴ ₥₳ł₦ⱡɏ ฿ɇ₵₳ʉ₴ɇ ø₣ ₮ⱨɇ vøłđ₴ ɇ₣₣ɇ₵₮ ø₦ ₳ ฿ɇł₦₲... " He explained

Alphys:" H-how did you... S-survive? " She said, still shocked

Gaster:" Ł ₳₥ ₮ɇ₵ⱨ₦ł₵₳ⱡⱡɏ ₦ø₮ ₳ⱡłvɇ ₦øɽ đɇ₳đ... Ł ₦ø ⱡø₦₲ɇɽ ɇӿł₴₮ ₳₦đ Ł ₩₳₴ ⱡø₦₲ ₣øɽ₲ø₮₮ɇ₦ ₩ⱨɇ₦ Ł ₣ɇⱡⱡ ł₦₮ø ₮ⱨɇ ₵ØⱤɆ... ฿ʉ₮ ł₮ ₴ɇɇ₥₴, ₮ⱨ₳₮ Ɏ/₦ ł₦ ₮ⱨł₴ ₳ⱡ₮ɇɽ₦₳₮ɇ Ʉ₦łvɇɽ₴ɇ ₩łⱡⱡ ₴ʉ₣₣ɇɽ ₮ⱨɇ ₴₳₥ɇ ₣₳₮ɇ ₳₴ Ł đłđ... " He explained

Asgore:" Hmmm... It seems that explains the familiar aura you give off... But why? Old friend. Why didn't you tell us when you were first transported in this room? " He questioned, he gets no response

Author:" Well... Thats all for this AU, the next one is the continuation of... Their genocide. "

When I said that. All eyes went to Frisk, and they look down in guilt

Author:" Alright then. Please return your attention on the screen. "

All of them stopped looking at Frisk and all of them returned their gaze on the screen

The screen then brights up

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𝙰𝚞𝚝𝚑𝚘𝚛:" 𝙰𝚗𝚍 𝚝𝚑𝚊𝚝 𝚠𝚛𝚊𝚙𝚜 𝚒𝚝 𝚞𝚙 𝚏𝚘𝚛 𝚝𝚘𝚍𝚊𝚢'𝚜/𝚝𝚘𝚗𝚒𝚐𝚑𝚝'𝚜 𝚛𝚎𝚊𝚌𝚝𝚒𝚘𝚗! 𝙸 𝚑𝚘𝚙𝚎𝚍 𝚢𝚘𝚞 𝚐𝚞𝚢𝚜 𝚕𝚒𝚔𝚎𝚍 𝚒𝚝 𝚊𝚗𝚍 𝚊𝚕𝚜𝚘

𝙽𝚘𝚝 𝚏𝚊𝚗 𝚊𝚛𝚝 𝚋𝚞𝚝 𝚖𝚢 𝚊𝚛𝚝 𝚒𝚗𝚜𝚝𝚎𝚊𝚍. 𝚃𝚑𝚒𝚜 𝚒𝚜 𝚑𝚘𝚠 𝙸 𝚎𝚗𝚟𝚒𝚜𝚒𝚘𝚗 𝚈/𝙽 𝚒𝚗 𝚝𝚑𝚎 𝚜𝚝𝚘𝚛𝚢, 𝚋𝚞𝚝 𝚞𝚗𝚏𝚘𝚛𝚝𝚞𝚗𝚊𝚝𝚎𝚕𝚢 𝙸 𝚖𝚊𝚍𝚎 𝚝𝚑𝚎 𝚋𝚘𝚍𝚢 𝚝𝚘𝚘 𝚋𝚒𝚐 𝚝𝚘 𝚏𝚒𝚝 𝚝𝚑𝚎 𝚝𝚊𝚒𝚕 𝚘𝚗 𝚝𝚑𝚎 𝚜𝚌𝚛𝚎𝚎𝚗. 𝙰𝚕𝚜𝚘, 𝚗𝚎𝚡𝚝 𝚠𝚎𝚎𝚔 𝙸'𝚖 𝚐𝚘𝚒𝚗𝚐 𝚝𝚘 𝚙𝚞𝚋𝚕𝚒𝚜𝚑 𝚖𝚢 𝚘𝚝𝚑𝚎𝚛 𝚜𝚝𝚘𝚛𝚢, 𝚊𝚗𝚍 𝚝𝚑𝚊𝚝 𝚖𝚎𝚊𝚗𝚜 𝚝𝚑𝚊𝚝 𝚝𝚑𝚒𝚜 𝚘𝚗𝚎 𝚠𝚒𝚕𝚕 𝚍𝚎𝚏𝚒𝚗𝚒𝚝𝚎𝚕𝚢 𝚋𝚎 𝚙𝚘𝚜𝚝𝚙𝚘𝚗𝚎𝚍 𝚞𝚗𝚝𝚒𝚕 𝙸 𝚛𝚎𝚊𝚛𝚛𝚊𝚗𝚐𝚎 𝚖𝚢 𝚙𝚞𝚋𝚕𝚒𝚜𝚑 𝚜𝚌𝚑𝚎𝚍𝚞𝚕𝚎. 𝙰𝚗𝚢𝚠𝚊𝚢𝚜 𝚝𝚑𝚊𝚝'𝚜 𝚊𝚕𝚕 𝚏𝚘𝚛 𝚝𝚑𝚒𝚜 𝚛𝚎𝚊𝚌𝚝𝚒𝚘𝚗 𝚊𝚗𝚍 𝙸 𝚠𝚒𝚕𝚕 𝚜𝚎𝚎 𝚢𝚘𝚞 𝚐𝚞𝚢𝚜 𝚒𝚗 𝚝𝚑𝚎 𝚗𝚎𝚡𝚝 𝚛𝚎𝚊𝚌𝚝𝚒𝚘𝚗, 𝚋𝚢𝚎!

Toby fox owns Undertale

Jael Peñalosa owns the Underverse and Xtale

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This is an inspiration from the boy next door by @clarakaulitzz! ⚠️ WARNINGS ⚠️ - Smut - drinking - foul language Hope yall enjoy 😊