Undertale a New Monster is He...

By Why_Is_It_Spicy

15.4K 349 85

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

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: Underswap
RT: Insomniac

RT: An Enigmatic Power

69 1 0
By Why_Is_It_Spicy


We see Y/N in the last corridor. He currently has a grin similar to Sans and his eyes were glowing in the dark. Infront of him was the human

" There's no point to this... Is there? You kill everyone. You gain LV. We fight. You win. You erase the timeline. And you reset... It's just that simple to you... Well... Lets just get straight to the point. " The battle starts

They attack first. He of course dodges

" C'mon... Human. You should know that I always dodge. "

He sends a barrage of spikes at the human. They dodge perfectly. He sighs and they attack

" There's no end to this, is there? " He said as he dodges

He turns their soul blue and and smashes them up, down, left, right, repeatedly before launching them across the hallway whilst forcing them to dodge multiple spikes. As they get close to the end, he teleports to them before smashing their face to the ground

" Oooh! That'll definitely hurt!! " Undyne laughed

" Undyne! "

" Whoops! Sorry, Ms. Toriel. " The blue fish apologized

" Had enough yet? " Y/N says as he sees them bring out a packet of instant noodles. They eat it dry

" ... Guess not. "

They attack again. He dodges and he sends them back across the hallway. He uses Sans's last attack, the blaster barrage


( 𝚂𝚘𝚛𝚛𝚢 𝚒𝚏 𝚒𝚝'𝚜 𝚕𝚘𝚠 𝚚𝚞𝚊𝚕𝚒𝚝𝚢, 𝙲𝚘𝚞𝚕𝚍𝚗'𝚝 𝚏𝚒𝚗𝚍 𝚊𝚗𝚢𝚝𝚑𝚒𝚗𝚐 𝚎𝚕𝚜𝚎. 𝙰𝚗𝚍 𝚙𝚕𝚎𝚊𝚜𝚎 𝚓𝚞𝚜𝚝 𝚏𝚘𝚌𝚞𝚜 𝚘𝚗 𝚝𝚑𝚎 𝚋𝚊𝚛𝚛𝚊𝚐𝚎 𝚘𝚏 𝚋𝚕𝚊𝚜𝚝𝚎𝚛𝚜, 𝚊𝚗𝚍 𝚗𝚘𝚝 𝚝𝚑𝚎 𝚠𝚊𝚕𝚕 𝚜𝚕𝚊𝚖𝚖𝚒𝚗𝚐. )

As the blasters fire. More blasters appear, this time their blue and firing counter clockwise

" Holy shit... This weirdo is way stronger than I thought... " Fell muttered

They expected this. The blue blasters go through them, they follow the blasters firing clockwise and stop and let the blue blasters go through them again. They keep repeating until the attack ended

" ... Yep, I expected that. "

The attack ends and this time, they attack. He dodge

" Y'know... Before you did this never ending genocide. I used to call you friend. "

They attack again

" Heck, maybe even... "

They attack again with more speed and force

" Little...

They attack again. This time they kept on attacking, not even letting Y/N speak or counter their attacks. As the attacks grew more vicious, Y/N grew tired

' Oh, no... Not again...! '

They kept on attacking. They attacked, and attacked, and attacked... Until they finally hit him

*9999999999*

...

....

....

...

...

Blood drips down on the floor. Y/N has been hit, once again

Everyone minus the XTale, Bad Sans'es, and The Gasters, flinch at the sudden gore they witnessed

" It was inevitable that he would get hit... Heh. It's quite entertaining that I could feel the vast amount negativity in this room. " Nightmare said. Error blew a raspberry

" ̶M̶e̶h. ̶I̶t'̶s ̶b̶o̶r̶i̶n̶g ̶i̶n ̶h̶e̶r̶e... ̶I ̶j̶u̶s̶t ̶w̶a̶n̶t ̶t̶o ̶s̶e̶e ̶̶̶w̶̶̶h̶̶̶e̶̶̶n ̶w̶i̶l̶l ̶̶̶A̶̶̶s̶̶̶g̶̶̶o̶̶̶r̶̶̶o ̶a̶n̶d ̶S̶i̶n ̶̶f̶̶i̶̶g̶̶h̶̶t... " Error muttered the last part

" Heh... I still wonder to this day how I bleed... Lil' bro/sis... " Y/N had a pained smile when he said that

The human felt something in their soul... It hurts them when they see him like that. He sighs before his eyes go dark

" ... Just do it... Just get over with it... "

The human shows some struggle, as if they are having a conflict with themselves. They stopped struggling and started to walk towards him

' Strange... Why did they struggle...? '

They then raise their knife. And slashes him once again

* NO EFFECT*

...

...

....

...

...

" Eh...? "

All were of course confused and shocked at the attack doing nothing

" Huh!? Is that supposed to happen? " Ink asked surprised

Author:" Well, this isn't really an AU... As it turns out. "

" Wait. Does this mean that the current Y/N has the same power shown on the screen? " XChara asked interested

Author:" Meh, dunno. It only says here that it's... Not really an AU...? "

" ... Well that didn't help. " Cross crossed his arms

" Well then, let's just see what will come. "

" Eh...? "

The attack did nothing to him. The human was just as confused as him

" Huh... I guess it finally awoken. " Y/N's grin widened

" Heh... Well, human. This upcoming battle will be something... That you will hardly FORGET. "


" It's been approximately XXXK resets. Preferably, 250-300k resets. "

This shocks everyone. 250k to 300k is enough to make everyone in the room insane

" Huh... That's way too much- even for me. " Nightmare said surprised

" That definitely takes the cake of most experienced resets. " Fell said

" Agreed. " Swap furrows his nonexistent eyebrows

" You might be wondering. Who's talking? Well... I'll assure you, it's still me. Y/N. "

Y/N's body started to glitch and his head started shaking violently

" I'm currently in an out of body experience. Hence the reason why my physical is moving like that. "

He starts to destroy the options one by one, until there was nothing left

The actions he took shocks everyone even more

" WHAT THE HELL IS HE!!? " Undyne yelled in shock

" H-he's n-not a b-boss monster... I-is he? " Alphys stuttered

" Ⱨ₥₥... Ł₮ ₴ɇɇ₥₴ Ł ⱨ₳vɇ ₴ø₥ɇ ɇӿ₱ⱡ₳ł₦ł₦₲ ₮ø đø... " Gasters glitchy voice echos throughout the room

" What do you mean, Gaster? " Asgore questions. Barely understanding him

" ₩ⱨ₳₮ Ł ₥ɇ₳₦ ł₴... ₳ⱨɇ₥. Ł'₥ ₴øɽɽɏ ł₣ ɏøʉ ₳ⱡⱡ ₵₳₦'₮ ʉ₦đɇɽ₴₮₳₦đ đʉɇ ₮ø ₥ɏ vøł₵ɇ, ₲łvɇ ₥ɇ ₳ ₥ø₥ɇ₦₮." Gaster murmurs something in wingdings

" Ah... Much better. Now, as I was saying. Y/N IS a boss monster, how do I know? Well...- "

" He was an experiment... Wasn't he... " Sans said as he glares at Gaster

" ... I'm afraid you're right... Sans... But unfortunately, I only remember a few pieces as it was a LONG time ago... It was after prince Asriel was born. " Gaster said, Asriel was confused

" What...? "

" Y/N was created by two ancient fossils before the war. I took samples of the two deceased titans before we were sealed underground. " Gaster explained

" Did you know what species were they? " Asgore asked

" Unfortunately no. I vaguely remember classifying them as an ancient monster species, and as well as asking your help in his creation, by using our magic. " Gaster continued

" W-wait!! Wouldn't that make Y-Y/N practically be r-related to you two!? " Alphys pointed out

What she said really got Gaster thinking

" Well... When you put it that way, I suppose you are right. It explains why he can use those blasters, and destroy the options. " Gaster said

Author:" Alright. Can we continue now? "

They all nod

As the piano plays in the theme. His now scarred face lights up with the beat

The attack starts with Y/N making their soul blue and surrounds them with spinning spikes, forcing them to dodge each one whilst they have to dodge pillars of fire while the screen inverts, making the controls reversed

It is now a survival game for the [PLAYER]

While they were dodging the spikes and fire, blasters rain hellfire at the human. Their soul suddenly turns green and they block the fire. Their soul turns back to their original color

Their soul suddenly turns purple, while the debris of the hall gets dropped on them. Y/N picks up a fallen pillar and uses it to play a bit of whack a mole. They get hit a few times

Their soul turns yellow. They shoot at Y/N, in which it had no effect. They shoot at the fallen pillar that he picked up and gets destroyed

Their soul turns cyan. Forcing them to stop as a few pieces of the pillar hits them. It shifts back to the original color and they dodge the rest of the pieces

Their soul turns orange. Forcing them to move through a few blasters. They have to move constantly due to the orange soul effect and a small space was left in the battle box

It calms down before a Yin and Yang suddenly appears. The souls turns into two on opposite sides as they have avoid getting hit with both souls

The battle box gets split as the soul gets trapped in the left box. Spikes from all directions come in and hit the human. The blaster hellfire begins once again as their soul turns blue, forcing them to dodge

As that pattern ended, green and purple platforms appear and all sides of the box was filled to the brim with spikes. Red knives suddenly appear and cuts the human. As more and more knives keep appearing, blasters came in and rained more hellfire

As the pattern ended. Y/N suddenly appeared, and picked them up by the throat. They see the endless void in his eyes as he threw them across the hallway

" ꓄ꁝ꒐ꇙ ꒐ꇙ ꌦꄲ꒤ꋪ ꇙꏂꋊ꓄ꏂꋊꉔꏂ... ꁝ꒤ꀘꋬꋊ. ꓄ꁝꏂꋪꏂ ꒐ꇙ ꋊꄲ ꏂꇙꉔꋬꉣ꒐ꋊꍌ ꓄ꁝ꒐ꇙ. "

Y/N's regular voice no longer held the same fondness and kindness as before. His tone was demonic, cold, and emotionless

They, however. Seemed to be unaffected at the sudden change of tone

They once again tried attacking, to no avail. There knife breaks as the pieces scatter thought the hallway. Y/N grinned to unimaginable lengths

" ꄲꁝ? ꒯꒐꒯ ꌦꄲ꒤ꋪ ꒒꒐꓄꓄꒒ꏂ ꓄ꄲꌦ ꃳꋪꏂꋬꀘ? ꁝꄲꅐ ꇙꋬ꒯... "

Y/N mocking them was the last thing they ever thought doing. It was very out of character of him

One by one. They collect and reassemble the knife. But the attacks were getting harder and faster to dodge

When they finally reassemble the knife. Y/N tricked them by destroying it again

They were now even more DETERMINED to bring him down and kill him

They reassemble the knife again, this time. They wait for the right moment to attack. It has once again become a survival game for them

They final attack was finally in place, as he does the blaster barrage. But this time, a lot more faster and even more blasters were used in this attack. The hallway releases a blinding light

As the light dissapears. It now shows a non-moving Y/N. It seems he has used all his power and energy in that last resort. The human slowly walks towards him

An X was now seen on Y/N's chest as he has once again... Lost to the human despite the power spike he got

The human walks away

The screen fades to black. Everyone except the Gasters and the Bad Sanses and ink, were too shocked to say anything

The Gasters, were surprised at the power shown on screen. They felt the power and aura through the screen

Ink and Error, meanwhile. They weren't as shocked as the others

" Wow... Who knew he could be that powerful... " Ink said. Dream nods

" Huh... No wonder that other guy was so powerful. " Nightmare said surprised

" ̶̶Th̶e ̶h̶e̶l̶l ̶i̶s ̶t̶h̶a̶t ̶s̶u̶p̶p̶o̶s̶e̶d ̶t̶o ̶m̶e̶a̶n? ̶̶̶̶Y̶̶o̶u ̶f̶o̶u̶g̶h̶t ̶̶h̶̶i̶m ̶b̶e̶f̶o̶r̶e? " The destroyer questioned

" Mhmmhmm. Although I think I hit a nerve, cause he quite literally blew me up to pieces. " Nightmare hummed

Author:" Welp. That's all for that clip. The other one is the same thing, but at full potential. "

" ... WHAT THE FU- "

~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-

This break is brought to you by... Undyne... Swearing for 2 minutes straight...

~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-

As Undyne finally calms down. The screen brights up

( 𝙰𝚕𝚛𝚒𝚐𝚑𝚝... 𝚃𝚑𝚒𝚜 𝚠𝚒𝚕𝚕 𝚋𝚎 𝚝𝚘𝚘 𝚖𝚞𝚌𝚑 𝚏𝚘𝚛 𝚖𝚎 𝚝𝚘 𝚍𝚎𝚜𝚌𝚛𝚒𝚋𝚎 𝚊𝚗𝚍 𝚠𝚛𝚒𝚝𝚎, 𝚜𝚘... 𝚃𝚒𝚖𝚎𝚜𝚝𝚊𝚖𝚙𝚜 𝚒𝚝 𝚒𝚜)

(0:01-0:25)

They weren't surprised at the slash and destruction of the hall. They felt a strange aura from the screen

(0:26-0:34)

As soon as the bell tolls. All of them felt strange. The dialouge that Y/N said, surprised them all.

(0:34-0:40)

As soon as one of the button were destroyed. All of them knew something was off. It wasn't the same as the last clip they watched

(0:40-0:48)

As soon as the blasters and hands appeared. All of them were already surprised. Especially the Gasters as they... and ONLY they have those hands unless they have fused or gave them away to another monster

(0:48-0:52)

Everthing was already different since they watched the last clip. Not only his eyes we're flickering, his soul as well

The UT cast were the most shocked at the fact that Y/N had the mythical rainbow soul. It was only a legend to them, until now

(0:53-0:56)

As soon as he attacked. It was already chaos. They have never seen so much power in one single monster. A monster that they least expected, had

As the attack continues, the fight gets even more chaotic

(0:56-1:09)

This is the time were reality no longer holds a meaning. Y/N bends it like it is nothing but a toy to him. The Gasters, especially XGaster. Knew he would be the biggest threat to them, and XGasters plans

(1:09-1:27)

As reality keeps being bended. The fight gets even more chaotic. As the attack rages on, The Sans'es notice Classic Sans's attack in the mix

(1:27-1:30)

As the giant hands appear. They get a good look at it to see it was more like Y/N's hands than Gasters

(1:30-1:48)

They have never seen Y/N so angry. His eye was shaped like a diamond while he was holding a purple scythe that was pointed at the screen

(1:48-2:01)

They raised a brow when they see the humans soul. It was soon flipped into Y/N's soul and perspective

(2:01-2:09)

It was back to utter chaos as Y/N stood tall and was swaying his entire body. His mouth started to show signs of melting

(2:09-2:15)

The Yinyang attack appeared once again. But this time, the soul was on both sides of the battle box. Nobody but the Gasters and Sans'es could comprehend any of the fight anymore

(2:15-2:28)

Nobody but the Gaster could see the soul anymore. It was filled with spikes, blasters, and fire. And the screen was flipping and rotating itself. The Gasters now wonder on how could he get so much power

(2:28-2:44)

The giant hands returned. They could no longer comphrened the fight. The Gasters were feeling an immense pressure and power from the screen

(2:44-4:03)

As the madness stopped. They were shocked that the human still managed to win. Despite the massive, massive power gap that both of them had. It was pure luck that they managed to survive

" WHAT!!? " Undyne shouted

" How did the ever-living hell did this kid survive!? " Fell exclaimed. He was shocked and impressed at the human

As the three groups were murmuring with each other. I cleared my throat, which got their attention

Author:" Alright. Now that I have your attention, there is still more to react to. The next one is... When Y/N finally breaks. "

" B-breaks...? W-what do you mean by that? " Alphys asked

" What he probably means that he has finally went insane. " Nightmare answered for me. I nod

Author:" Yes, that is right Nightmare. Alright, now. Please turn your attention to the screen. "

The screen brights up

~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-
Author:" And that wraps it up for this chapter! There isn't really much for me to say in this but one. When I wrote the second chapter for my other story, I thought the little girls name was Hana! But I thought wrong as it turns out to be Rika...

Well anyways, I hope you guys enjoyed today's/tonight's chapter, and I'll see you all in the next one, bye!

Toby Fox owns Undertale

Jakei owns The Underverse and XTale

(P.S: This will probably go on hiatus due to my lack of ideas. I will still write on this story if Underverse 0.8 part one is out. And I will put my main focus on my other story, One piece:" The Monstrous Crewmate".)

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