Tale of Dark Gathering (Undertale x Dark Gathering Crossover Story)

Prologue: The Dark Gathering Plan

(In the Judgement Hall...The human child that commited genocide on a race of monsters shows up as Sans was waiting for them to appear.)

Sans: So...you've finally made it. Took ya long enough.

Frisk: ...

(They expressed with a determined look on their face)

Sans: What? Were you expecting a joke? Well... not this time. I'm just here to ask you a question. Why did you do it? Did you really kill every monster out there just to prove a point? Did you really kill every one of my friends and family not because you should, but because you can?

Frisk: ...

(Frisk takes one step closer to Sans)

Sans: Heh, well let me ask you this. Do you want to have a bad time? Because if you take one more step foward, you're really not gonna like what happens next.

(Frisk takes another step closer to Sans)

Sans: *Sigh*, Sorry old lady...This is why I don't make any promises.

(The scenery turns much darker, as the night light shines through the windows, filling up the Judgment Hall with a dark blue shine.)

Sans: It's a beautiful day outside...Birds are singing...Flowers are blooming...And on days like these, kids like you...SHOULD'VE NEVER EXISTED.

(Sans' attitude towards the human suddenly turns from calm to intense. Meanwhile, in a different world...Nightmare and a "mysterious ghost" discuss their plans to take over the Multiverse.)

Nightmare: Are you ready for this? Eh Kami?

Kami: Heh. I'm always ready.

Nightmare: Good...Now it's time for "The Dark Gathering Plan."

(Meanwhile, at a different, different world. Yayoi, Keitaro, and Eiko go on another adventure to gather some ghosts.)

Yayoi: Huh? That's strange...

(Yayoi looks up at the sky)

Keitaro: Eh? What is it Yayoi?

Yayoi: Look up there.

(Yayoi points up at the black hole in the sky.)

Keitaro: What is that?

Eiko: I don't know. It looks like a black hole of some sort.

Keitaro: *shivers* I have a bad feeling about this. Yayoi! Do you have any idea what's going on? You're the ghost expert here?

Yayoi: No...I don't. This is my first time seeing this. We might be in for a bumpy ride.

(Back at the Judgment Hall. Sans uses his gravity manipulation/telekinesis powers to keep Frisk in place.)

Frisk: *struggles*

Sans: *panting* Well...That was my last attack. I see you're very determined. No matter the challenge or obstacle, you always seem to overcome them. *Yawn* I know you're just gonna kill me eventually. So I'm just gonna keep you there, until the end of time.

Frisk: *struggles even more*

Sans: That being said...The most determined move you can make now is...to give up. *Falls asleep*

(Frisk escapes from Sans' gravity manipulation, allowing them to move again.)

Sans: *zzzzz*

(Frisk steadily walks up to Sans, as they prepare to slash Sans with their knife. Then, at that moment...)

Sans: *wakes up and dodges* Did you really think you were gonna- *shocked* What?!

(Sans looks at the black hole behind him)

Frisk: ?

(Frisk seems to be confused too)

Sans: Kid? What is that? What did you d-

(The black hole pulls Sans in)