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Undertale and AUs Oneshots

Summary:

Hello! This is my Undertale Oneshots that I wrote late at night! To be honest, I'm really nervous about sharing my writing (it's dumb af-) but I'm gonna share it because I love writing!

Notes:

One Shot Summary:

After he had died, he was trapped in the Void for so long that he forgot his past life— other than Undertale, it's the only thing that he can remember. Then one day, he was summoned, and out he came...as a Gaster Blaster?!

Chapter 1: I'm a Gaster Blaster?!?

Chapter Text

"Well shit—"

 

I can't believe those are my last words before death. But hey, better than nothing, I guess.

 

How did I end up like this? Well, I was just buying groceries at the store, minding my own business. When all of a sudden, a fucking truck rammed into me. Yeah, not the best way to go...

 

My ears were ringing loudly, my vision blurry, the last thing I saw and heard was someone shouting that I should stay with them. Welp, too late buddy. My life sucks ass anyways.

 

Darkness consumed me as I smiled.

 


 

How long have I been floating aimlessly in the endless black void?

 

Hours?

 

Days?

 

Weeks?

 

Years?

 

I don't really know... But I missed seeing colors, life... Anything that doesn't involve here in this eternal void.

 

I even forgot what it's like to eat, sleep, or even breathe. All of my memories from my life are mostly gone.

 

FYOOOMMM

 

Huh, I think I'm starting to hallucinate or something. I saw a white blur and heard... what should I call it? Blasting, I guess? A sound you can hear from a video game. Now that I mention it, it does sound familiar.

 

Oh—! I remember now! It's the Gaster Blaster sound from Undertale after it fires!

 

Strange, but why am I hearing it though? I tried to focus on the sound, but nothing.

 

Meh, maybe I was hallucinating it, after all.

 

Just as I thought of that, a bright pillar of white and yellow light appeared. I blinked several times, not believing what I'm seeing.

 

Something new?! An actual way out?!?

 

OH HECK YEAH, I'M DIVING STRAIGHT INTO THAT THING, I DON'T CARE ABOUT THE REPERCUSSIONS IF I DO!

 

WOOOHOOO!! FREEDOM!!!

 


 

Sans has been battling this genocidal human child for a good 20 hours now. They couldn't dodge Sans' attacks at first. But after they keep dying and coming back over and over, they now know how to dodge the attacks skillfully.

 

Sans tried new attack patterns to catch them off guard. But they always dodge them each time. Sans hasn't even damaged them since then.

 

He's so tired...

 

In one last attempt, Sans went all out. Bones went flying, blasters were firing, the walls were cracking loudly.

 

Heh, not even a loss of a single HP on the human... Sans really is weak.

 

Sans summoned his last blaster, almost all of his magic depleted at the act. Sans fell to his knees as the Blaster came into existence.

 

...Is it just Sans or was his Blaster barking with joy?

 

It soon stopped and looked around in confusion, whining like a lost puppy.

 

Did this blaster gain sentience? Sans questioned internally as he looked over the blaster.

 

The human child chuckled diabolically at Sans' pitiful attempt to fight back. Sans perked up and called for the Blaster—

 

"hey!" The floating dragon skull flinched, looking for Sans' voice. "i'm over here!" The blaster turned their body(?) to Sans. It widened its eye sockets by a large margin— it was surprised, shocked, and excited to see Sans.

 

Sans pointed to the human, giving the blaster a stern look.

 

It floated in front of Sans and looked at where he was pointing. The blaster eye lights shrunk to pinpricks, as if knowing the human was dangerous. It honestly looked like it was panicking. Sans honestly felt bad that he was putting all of his faith in his weapon. But this was a last resort, his last hope— EVERYONE'S only hope. King Fluffybuns would fight but he's way too nice to fight anyone— unless it was a human he's fighting, but this child wasn't one anymore.

 

The demon charged towards the blaster and Sans, knife held tightly on their hand. They had an insane grin as their red eyes gleamed dangerously.

The Blaster opened its mouth wide. Powerful magic swirling inside the mouth. Sans has never felt such powerful magic before, and so much of it too, Sans dare says it could even make a god jealous.

 

It fired, the beam was fast and precise, it gleamed of absolute power. It was so fast that the demon couldn't even react. It hit them, instantly killing— no that's an understatement, it OBLITERATED them, leaving behind nothing. As if they were never there.

 

The beam also left an enormous hole in the castle, and Sans has never felt so small in his entire life, and he was already short! He was also surprised that the Castle was still standing and not collapsing.

 

Sans jaw dropped as he looked at his weapon, too stunned to think of anything. The floating dragon skull turned its attention back to Sans, it stared at Sans for a few moments before it tackled him into a nuzzle, cooing loudly.

Sans bursts into loud laughter as the blaster was nuzzling his ticklish spots.

"OH MY GOD STOP! IT TICKLES! MERCY PLEASE! I BEG— HAHAHAHAHA!" Sans pleaded in mirth.

 

The world stuttered as it went black, implying that a reset has happened.

 

Sans wheezed as he fell off his bed with a thud, his laughter was muffled by the floor. The dragon skull was somehow still there and floating slightly above Sans. The blaster looked amused and happy.