POSTED


UNDERFALL - AUTHOR's NOTE

It's not a typo, even if it does look like Underfell. It's just that universe with my own headcanons, so feel free to use them if you want. Like I said, this is just the same AU. Rated T for cursing and dark thoughts (coughUnderfellcough). It's like an AU of an AU?

This is like, my first fanfic ever. I wasn't even going to write it, just enjoying it on my mind seeing how it would go if certain events happened. But then I went into Tumblr after Idk how much time and got the nerve to post some Undertale and Deltarune fanart (like my pic profile). So, I'm giving this a shot and we'll see how it goes!

Reviews and constructive criticism is appreciated, tell me what you think about this story! This first chapters are more of a prologue where I'll be introducing (almost) all the character I'm going to use and the timeline is not linear. Like, when Frisk falls down is present time and once I say something like (years ago), unless I say otherwise in the next part, it stays in that (years ago) moment in a general span of time. This is to shape this kill or be killed world and my interpretation on how it would come to be.

English is not my first language either, so this serves me as practice too. Anyway, enjoy!


It smelt like flowers.

Climbing the mountain had not been easy in the least, and not just because of the height. Mount Ebbott was known to be a rather dark and dangerous place, where people go to disappear and never return. It seemed like a nice thing, to be able to let go and just not be remembered by anyone anymore. There was a theme with all the people missing over the years in the city below, and that was that the people that disappeared?

They always wanted to.

Maybe that was the reason for them to be here, climbing the mountain with an unusual atmosphere. It felt ominous, never changing and forever there to keep a watchful eye over the humans. Always a temptation, always a thought buried deep in their minds.

Frisk was not deterred, though. They didn't climb it for a happy reason, similar to the other people that preceded them. But maybe, just maybe, they would be able to go and come back a changed person. A person that wasn't hurt by what others thought of them, of what others could do to them, either in a physical or psychological way. They knew it was not realistic, but one could wish.

A last wish before letting go.

Whatever that meant for them.

They saw a huge tree just a bit further on the road. Deciding to rest a bit in there, they approached the shade. What they didn't expect was there being a hole just by the roots. It seemed very old, with moss on its sides and smooth rocks, probably caused by the rain. It was a curious thing, like it was just meant to be there in the middle of the way for unsuspecting people to fall and die.

Fitting.

Getting up, Frisk decided that maybe this had not been a good idea. But they were determined to reach the top of the mountain nevertheless just because they could. With the hole in the ground averted, there shouldn't be any problem at all. And so they got up.

Or, rather, tried.

A root made them slip, their boots stepping over the smooth rocks they had been looking at before, failing to get a grip. With a last effort to stop themselves from falling to their death in such a stupid way, they reached up with their tiny little hands.

The scraps in their hands hurt, some dirt stirred, but they fell nonetheless. They cried out for help, the sky and everything aboveground decreasing in size…

But nobody came.


20XX - Years ago.


Snowdin. The place never changed, the scenery was just the same as it always was. Just, you know, edgier. Ever since the prince fell, it seemed like the kingdom just decided to collectively flip their shit out. He never thought this would happen to the nice little town he remember in passing. It's not like he remember all that much, though. Just… Maybe?

His mind was kind of scattered, his memories of the "before" were not much better and they could be described as spotty at the best of time.

Guess that much ketchup was messing with his mind.

And talking about ketchup-

"Hey Grillbz, put it on my tab. Get me another one for the way?" Sans never was the most energetic monster. Kinda.

Taking the ketchup from Grillby's to his station just seemed so much work. Still, he would persevere. He needed to if he wanted to try to stay awake for the usual time Papyrus goes to check on him. Heh, go figures, never trust the big brother to stay by himself doing nothing on an old wooden shack?

It's not like a human is going to fall here anytime soon. And even if they did, the old lady behind the door would try her damn hardest to try to avoid them to reach the rest of the Underground, even if it meant killing them. Not that much work to do. And oh boy, hell hath no fury like a woman scorned, Asgore was going to get what was coming to him. Of that, there was no doubt in his mind.

"…" The flame elemental didn't say anything, his purple flame illuminating the place in an almost ethereal look. It was alluring and his bartender clothes were finely pressed and elegant, with just the perfect amount of wildness to his look. Neck exposed and his fire hair all back and styled.

"Yeah, yeah. Don't look at me like that, Grillbz. I'm not trying to steal the attention away from you, "hot" stuff."

Touching delicately the skeleton's skull and focusing on the black under his eyes, his purple flame seemed to shine with some blue in its core. Nearing the skeleton slowly, breath inches apart and deep magma eyes staring at the red pin pricks of magic in the eyesockets of the other monster…

He hummed and let go, going back to his initial position and his perfect purple flame.

"…" Grillbz walked away, just to come back with a bottle of ketchup and a disapproving head-shake.

"Oh, c'mon Grillbz, that wasn't so bad."

"…" Another disapproving look. Sans was on a roll, wasn't he?

"Actually, I think I'm all fired up and ready to go. You know how it is when I'm not at my station in time. See ya later, pal." Said Sans, already getting up and going out into the cold air of Snowdin. Avoidance seemed the best course of action, after all.

Sans pulled up the end of his sweater over his mouth, careful not to get any snow in his metaphorical lungs. Like, he's a skeleton, but he still needs to breath? The disadvantages! He didn't want to breath any dust without noticing, thank you very much.

It was rare in this part of the Underground, with Asgore having his focus on more populated areas like Hotland and New Home, but still. Waterfall wasn't any better with most of the Royal Guard going there to the training grounds.

Actually, thinking about it, it was rare that almost no one wanted to go to the core.

Huh. Weird.

There was always something else going on in that place anyway, he couldn't exactly describe the feeling, but…

He could relate to the uneasiness of most monsters of the place, even if something at the back of his skull nagged at him that there was a valid reason to stay far from there.

It's not like he wanted or needed to go to the Core.

Lost in his thoughts, Sans had stopped in the middle of the town without moving for a few moments.

"Oh, crap, I'm gonna be late again! And this time I wasn't even sleeping!"

And so, he went on his way.


Toriel didn't think she was that bad of a mother, was she? But maybe she was, maybe she was just deluding herself in her own little fantasy.

After all, her first two children died in a tragic way full of pain and despair. They were so young, they had so much to live for… Her little Asriel and her sweetheart Chara. She missed them so much every day, it was so painful to think of them, of what happened when they tried to cross the barrier, only to come to a cold home to die. So wounded, so hurt.

She didn't know the specific part, she was no scientist, but when a monster fusions with a human soul, the human is still there somewhere. That was how the monster that opted for this fell in the war, after all.

She didn't even know, couldn't suspect, refused to suspect… And yet… All these years had passed, almost completely alone in the sealed Ruins. Trying to stop his husband from killing anymore. No more children would die if she had a say in it.

Her husband? No, she refused to think about him that way! Not anymore! What did that old goofy idiot expect from this path he had set monsterkind on? Peace? Revenge?!

They were all going to die! Most monsters nowadays only cared about their stats, their strength. It would be messy and over very quickly. What good did having high stats if you couldn't work with someone else to watch your back? Without the united front that monsterkind used to have?

What happened to that?!

Easy. Asgore happened. It was all his fault! Fighting violence with more violence would never work! The humans were stronger by nature and the monsters were decreasing in number with time, all the killings to get LV just accelerated that.

Most monsters didn't even know what LV, let alone EXP stood for. It was an acronym ideated by the Judges when monster and humans used to live in peace.

HOPE, LOVE, EXP…

Toriel was filled with hatred and grief.

Damn it, Asgore!

But maybe, just maybe, he was not the only one at fault, was he? What good was she doing anyway? Just there in the ruins, trying to keep all the human that fell safe and protected from the rest of the Underground.

And all of them ran away.

She really was a bad mother.

Toriel was filled with hate!

"Hmph! Now, where were those snails I had? I'm sure they were in the fridge somewhere…" maybe it was best not to think about it anymore.

A queen without her kingdom. A mother without her children. A spouse without her husband. An old lady without anyone to talk to…

"knock knock" came the sound from downstairs.

Well, she wasn't being fair to her only link with the rest of the Underground, was she? Six humans had crossed that door, just to die at Asgore's hand. One more soul, and it would all be over.

That seventh one, the last human soul. They needed to stay in the ruins, no matter what. Asgore would not succeed, because she will stop him. No matter the consequences. No matter the cost.

Even if she needed to kill them and go to stop Asgore herself.


So, there they are. Introducing the first characters on the story!

The introductions should be over by the third chapter, I guess. I really wanted to try and make the characters justice. Not to make them bloodthirsty or aggressive just because I can. I want to give them reasons for the things they do, why try and stop Frisk, why they look and act like they do as opposed in the original Undertale.

My general headcanon with Underfell was that it started out in a common setting with the original, but it deviated from there because something went wrong. Instead of becoming the characters we know and love, they became something else. Something dark, darker, yet darker. Ehem.

So, that was it for the first chapter!