This is ARStudios back with another Fanfiction!
And this time, it's a crossover! Of RWBY, one of the greatest Anime of all time, and Undertale, one of the greatest RPG's of all time! Read and enjoy!

Ruby's Adventures in Underground

Chapter 1: Phenomena at it's worst

Science class.

Boring facts and figures.

Tons of boring words droning on and on. That's what it was.
And the worst part?
Professor Goodwitch herself wasn't in the mood, and was saying things slowly. It was hard to take her seriously at all.

The topic which she was explaining this time was regarding wormholes; one of the most interesting theories to hit the science communities. Unfortunately, Glynda was talking in a super low monotone. So as usual, nobody took her seriously.

Ruby was the most bored. Science was so boring. Just endless words coming on…and on….and on…

Professor Goodwitch came to the point, "Now class, just remember that as far away as a wormhole sounds, it has been theorized that due to the unpredictable, and sometimes unstable nature, of what we call space, it should be remembered that wormholes have an ability, hypothetically, to show up ANYWHERE. That's how the guys at the science community go…."

Ruby was drawing something. Weiss was constantly getting bugged by the fact that Ruby never paid attention to science class. Sure, science doesn't have much to do with Hunting Grimm, but it's good to know how the world works. The only other person who was actually listening was Pyrrha. Let's not leave Ren out… or even Velvet (WTH?). Jaune was busily snoozing with his eyes open. All that practice finally taught him how to sleep with your eyes open.

Weiss looked down at the picture Ruby was drawing, and saw what it was; a badly drawn portrait of herself and Ruby, holding hands with 'BFFs' written all over the top of the page.
Weiss had seen too much of this behavior for the whole damn term. First, Ruby bugged her the most. Second, she kept calling Weiss 'BFF'. Third…yeah, you're better off putting this one yourself.

Weiss decided enough was enough.

"Ruby," Weiss said, to which Ruby said, "YEEEEEEEEEEEEEEEEEEEEEEESSS?"
"Why do you always act so strangely?"

"Whatever could you mean, BFF?"
"There! That! Why do you always act like that? Like asking me to dance with you during the Beacon Dance?! That was embarrassing!"
"Well, who else could I ask?"
"Uh…..the, like, 500 other guys all over campus?"

"But they're so incompetent! In fact….Beacon always looks kinda deserted, doesn't it?"

"Yeah….I wonder where everybody goes?"

"Besides, Weiss, after the falling out we had, we've improved! So I can consider us as besties!"
"NO."

"Why not?"
"I've known you for only a term. We can't be BFF's already…."

"Clearly, you don't know how Friendships work."
"I do! It's just….the way you've been acting…it's weird."
"How?"
"Well….for starters…it makes you look…..lesbian."

"WHAT?!"

Ruby had jumped up from her seat when she had screamed that, and everybody heard it, jogging them up. Glynda looked angry, and said, "Miss Rose, may I please know what the excitement is?"
"Oh…." Ruby said, embarrassed, "Nothing…."
"Were you paying attention to my lecture?"

"Um….."
"I can't hear you. Speak louder."
"um….no….."
"I can't hear you. Maybe you should come over to my desk so I can hear you."
Everybody gulped. Glynda asking you to come to her desk never ended well. No need for examples.

Ruby sheepishly walked over to Glynda's desk. Yang elbowed Weiss and said, "What was the point of that?"
"Hey! It's her fault!"

Ruby stopped in front of the Judgment stand.

"Miss Rose…..could you please tell me what this whole topic was about? And don't look at the board."
"Um…"
"Wormholes, Miss Rose. And what is a wormhole capable of? According to the scientific community?"
"Um…..spawn worms?"
"Miss Rose, this is not a joke. Wormholes are capable of taking you between two points in space-time. Essentially, a shortcut in space and time. And what is the most dangerous thing about wormholes?"
"Um…UHHHH…"
Suddenly, a noise of crackling and electricity was audible. Then a strange sucking and popping sound.

And right in front of everyone's eyes, a smoke-like hole popped up, not 5 metres from Ruby. Suddenly, she felt a pull, and was pulled into the wormhole (Pretty lame excuse plot, huh?)

Glynda said, "Very good, Miss Rose. They might be able to pop up anywhere." …

Realization.
"RUBY! EVERYONE CLEAR OUT!"

1 minute later

Weiss was covering her face with her hands. Blake noticed, sat down beside her, and asked, "What is it?"
"it's my fault…"
"What?"
"I should've have started complaining to Ruby on her behavior…..now she's been sucked into a portal!"
Yang said, "Weiss, Ruby is stronger than you think. No matter where she ends up," and she looked away, "Anything that will try to kill her…..she can beat it."

"But….what if…..wherever she ends up doesn't …" Weiss then stopped, and said, "No, I'll just make it worse."

Blake sighed, "The most we can do….is hope."

Ozpin came, and said, "Now don't worry. Ruby is a very accomplished Huntress. But even so, we will be sending in someone to go after her."
"Who?"
Meanwhile…..

Ruby was spinning around, screaming at the top of her lungs. The smoke-like tunnel never seemed to end.
"AM I JUST GOING TO KEEP SPINNING AND TWIRLING AND SCREAMING?!"
Until she saw the light. It grew larger.
She fell through it.

And fell on darkness.

Soft darkness.

Well, that's the end of Chapter 1.