Disclaimer: See Summary.

A/N: Hello. It's been a while, hasn't it?

Anyway, this story has been floating through my mind for a while now, and I wanted to have this established before I forgot about it. I also wanted to establish some lore about my head canon.

Frisk and Chara are female, and use female pronouns.

Sans is Papyrus' older brother.

Mettaton used to be a ghost named Happstablook, or Happsta for short.

Mettaton is a female ghost, despite the somewhat masculine shapes of EX (and NEO).

The events of this story take place in the Earth year 2015, the year Undertale was released.

Chara fell some time in the 1950's.

Frisk is accompanied by a teenaged girl whose identity will be revealed later.

Some AU versions of Sans, like Blue, Fell, and Ink, will be mentioned at some point.

There is a rare eighth SOUL trait, which will play a key role in the history of the Underground.

Soul traits are not reflected by eye color, i.e, a human with green eyes doesn't necessarily have a soul of KINDNESS.

For the sake of simplicity, fights will be more realistic than the game portrays them.

So, without further ado, I present the prologue chapter of Mercytale.

Long ago, two races ruled over the Earth:

HUMANS and MONSTERS.

One day, war broke out between the two races.

After a long battle, the Humans were victorious.

They sealed the monsters underground with a magic spell.

...

Many years later...

...

Legends say that those who climb the mountain never return.

...

Such seemed to be the fate of one Human child and her companion.

This is their story.

...

...

...

Ugh, what happened?

Where am I?

Who am I?

I slowly sit up, rubbing my forehead. I open my eyes to look around. Turns out, I survived the fall and landed on a bed of...golden flowers? Wait, how did I get here?

I hear a noise to my left and see a little girl lying face down in the flowers. I remember now. I saw her fall in and tried to save her, but somehow fell in as well.

She sits up and looks around, before her brown eyes lock on to my blue eyes. I get to my feet to help her up. "You okay, kid?" I ask.

"Uh huh," She replies. That's a relief. Though, how neither of us died on impact still evades me, along with pretty much everything about me.

"You know, you could have really hurt yourself doing that." I tell her. "Heck, you could've died. I'd say that's pretty foolish."

"Well," she replies. "You fell in after me. So I guess we're both fools."

She's right. I didn't need to follow her. If only I could remember how I got there in the first place. But that can of worms can wait, I suppose.

"So," I start, "I don't suppose you have a reason for climbing a mountain knowing the dangers, do you?"

"Legends have it that there are monsters down here." She says. "I wanted to see if the rumors were true."

"I see." I reply. "Well, now what?"

"I, uhh, don't know." She says.

I fold my arms and rub my chin in thought. What now? Suddenly, something catches my attention. My young companion sees it too.

Walking over to a small clearing, we look down to see a lone flower. Suddenly, it looks up at us and smiles. Okay, I don't know how much I remember, but I'm pretty sure that's not normal.

"Howdy." It says, in a bizarre, yet distinctly male voice. Nope, definitely not normal. "I'm Flowey. Flowey the flower." The child and I look at each other, and she shrugs, apparently as clueless as I am. "Hey, you're new to the Underground, aren't'cha?" Flowey asks us. We both nod as he continues to smile at us. It's only slightly creepy.

"Golly, you two must be so confused." Golly? Who says that anymore? "Looks like someone's going to have to teach you two how things work around here. Guess little old me will have to do." He winks at us, and the creepiness factor seems to go up.

Suddenly, I feel something being pulled out of my chest. I look down to see a small heart shape, roughly the size of my fist, floating in front of my sternum. I look over to my small companion, to see that she is in the same situation.

"Whoa," I say.

"Hmm, never seen that before." Flowey says, looking suspiciously at me.

"What is it?" I ask.

"That is your SOUL." He explains. "It's the very culmination of your being. Though, I've never seen one like yours before."

I look down at my SOUL, and contemplate what it may mean. I look over at my companion, whose soul is glowing red. Mine, on the other hand, is a rainbow of colors: Red, Orange, Yellow, Green, Cyan, Blue, and Purple. That is strange.

"Anyway," Flowey interrupts. "Your SOUL starts out weak, but you can get stronger by gaining lots of LV."

"LV?" My companion asks. "What's that?"

"Well, it stands for LOVE, of course." He replies, as if we should have known that. "Down here, LOVE is shared through little white..." A circle of white petals appears around him. "...Friendliness pellets!"

Something seems off about all this, and my instincts are kicking in.

"Go on," He encourages. "Grab as many as you can!"

As they fly towards us, I grab my friend and pull her out of the way. Flowey's eyes narrow and his smile falters a bit. "Hey, uh, buddy." He deadpans. "You missed them." He sighs. "Let's try that again, k? Try and touch 'em this time." Again, he sends the little white objects at us, and again, we avoid them. Now his smile is completely gone.

"Is this a joke?" He growls. "Are you braindead? RUN...INTO...THE...BUL-Friendliness pellets." The fact that we can tell he meant 'Bullets' pretty much gives away his game. Once again, we avoid his attempt at "Friendship."

Flowey's face remains the same for a brief moment, before he puts on what I can honestly, only describe as a Jack o'lantern face.

"You know what's going on down here, don't you?" He asks, in a very creepy voice. "You just wanted to see me suffer, didn't you? Well, down here, it's KILL OR BE KILLED!" Oh, crap. Suddenly, we're both surrounded by his tiny white bullets. Double crap. "DIE!" He yells, laughing maniacally as the pellets close in on us. I pull my friend in close and brace for impact.

But it never comes. Flowey stops laughing and seems confused. "Huh?" He asks. Suddenly, a small fireball smashes into him, sending him flying. I look up to see someone approach us. She's tall, with snow white fur, bright red eyes, and a pair of small horns. Was this one of the monsters my friend mentioned?

"What a pitiful creature, threatening such poor, innocent children." She says in a sweet, calming voice. "Fear not young ones. I am Toriel, caretaker of the RUINS."

"Hello, Ms Toriel," My friend says. "I'm Frisk."

"Well, it's nice to meet you, Frisk." Toriel replies. "And who are you, dear?"

"Oh, uh..." Shoot. Why can't I remember my own name? "I...uh, don't remember. I think I hit my head on the way down or something."

"Well, you need not worry, my children." Toriel says, smiling. She takes each of us by the hand softly. "Come, I shall lead you two through the RUINS." Without many other options, Frisk and I decide to trust this kind monster as she leads us away.

A/N: So, there you have it.

Now, for those wondering where the heck the next chapter of Fates Rewritten is, hold your horses. I have life to deal with. Now, as you can tell, I changed a few details, mainly the fact that Frisk mentions her name to Toriel. And as you may have guessed, the mystery girl is the one with the eighth SOUL trait. Can anyone guess her identity. And no, she's not the Mystery Girl from Steven Universe, otherwise this would have been a crossover fic. And can anyone guess what the significance of a rainbow SOUL is? 'Cause I'm not telling anyone just yet.

Anyway, I'd also like to establish that this is my first Undertale fanfic, so I might take a few liberties with it.

Next time, our heroes traverse the RUINS, meet a mysterious new ally, and learn their way around.

Until next time, please RRF&F, and I'll see you all next time. Peace out, and may the Force be with you. Always.

Voice Actors/Actresses:

Mystery Person: Ashly Burch (Cassie Cage, Mortal Combat X)

Frisk: Tara Strong

Flowey: Alex Hirsch (Bill Cypher, Gravity Falls)

Toriel: Susan Egan (Rose Quartz/Pink Diamond, Steven Universe)