Hey guys! I'm doing a thing! I've read a couple cute RWBY Undertale stories and thought I would do a thing too. It is definitely probably going to be similar to some stories, but it isn't intentional. This is a crossover that isn't exactly easy to work with. Any who... let's do it.

I don't own either. Respective franchises and characters belong to Toby Fox and Rooster Teeth/Monty Oum. BTW, Ruby and Jaune are dating in this. I ship Lancaster :P (I think that's their ship. I call it Raspberry Lemonade though I have heard differently)

Chapter one: The Ruins part I

Ruby and Yang were walking up the mountain side. They were sent on a Grimm clearing excavation up on Mount Ebott. Things were going well, but Ruby felt like there was something... off. Something was attracting the Grimm to this specific area of the mountain. She and Yang kept walking, weapons in hand (Though for Yang, that was inevitable). Yang noticed a giant hole near them and stopped. Ruby however, wasn't quite that fortunate, and fell into the hole.

"RUBY!" Yang cried out in alarm. She tried, and failed, to catch her sister before she plummeted to her presumable death.

"Uh... what the heck?" Ruby muttered, regaining consciousness. She tried to remember what happened. 'Let's see...' she thought to herself. 'I was on a mission with Yang when I fell down here... but where exactly is here?' Then it hit her. "Yang!" She gasped, her silver eyes widened with shock before quickly sitting up. She winced in pain. That was when she felt something wet trickling down her face. She placed a hand to it and checked, and discovered that it was indeed blood. Assuming that she must have hit her head in the fall, she wiped it off her hand and looked around, leaning heavily on Crescent Rose. Amazingly it survived the fall. Amazingly she survived the fall. She appeared to be in a cave. What she landed in was a bed of flowers. Ruby assumed this was what kept her from being killed. She got to her feet and looked up. There was a bright light coming from the hole she fell down, the sun. She could hear her sister calling for her. She called back saying that she was okay, and was going to find another way out. Yang hesitantly agreed, stating that she was getting help. Ruby started walking until she came up to a giant purple door with a weird symbol on it.

"Strange... that symbol looks familiar..." Ruby muttered to herself, taking a picture of it with her scroll. "I'll research it if- WHEN I get back."

With a grunt, she opened the door. It was heavy and cold, probably made of stone. Ruby took all her effort to close it again, panting and trying to catch her breath.

"Howdy!"

Ruby's head shot up and pointed Crescent Rose. She looked around, trying to figure out where the voice came from, until her eyes settled on a little flower in the middle of the room. She sighed and re-placed the gun on its harness.

"Uh, hi?"

"I'm Flowey! Flowey the Flower!"

"Ruby."

"Yeah, that's nice kid." The strange plant muttered with a frown before reforming his sweet smile. "You're new to the underground, aren'tcha? Golly, you must be so confused!"

"Kinda, yeah..." Ruby admitted, chuckling nervously. The little plant, Flowey was it? Rolled his eyes at her again.

"You talk a lot... Anyways! Someone ought to teach you how things work around here! I guess little old me will have to do! Ready? Here we go!" Ruby stared in shock as her heart appeared floating in front of her chest, glowing a bright red. Everything else, including her and Flowey, was in black and white. "See that little heart floating around? That's your SOUL! The very culmination of your being! It starts out weak, but grows stronger as you collect LV!"

"Collect what?"

"You mean you don't know what LV is? Why, LOVE of course! You want some LOVE don't you?"

Ruby wasn't stupid. She knew a trick when she saw one. At first she was gonna say no, but she thought she'd piss off a plant that day.

"Yeah, sure, why not?"

"Down here, LOVE is spread through little white... friendliness pellets! Move around, catch as many as you can!" He smiled happily as tiny seeds formed above his head, then fired at Ruby, who simply moved out of the way. This seemed to have both confused and angered the plant, considering the face he's making.

"Buddy, you missed them... let's try this again shall we?"

He tried again. Ruby did the exact same thing as before. Though he got even angrier.

"Is this a joke? Are you brain dead? RUN. INTO. THE. BULLETS! Friendliness pellets!" He corrected himself quickly, but Ruby heard him. His third attempt, she dodged again, more gracefully than the other two times. Suddenly Flowey's face got super creepy, contorting into a weird smile. With a lower than before scratchy voice, he spoke.

"You know what's going on here, don't you? You just wanted to see me suffer!"

Ruby began to panic. She told him she had no idea what was going on, but he wouldn't listen. She watched in horror as she was surrounded by pellets. She tried using her semblance to get through them, but only got hurt. She listened as Flowey muttered his last sentence to her.

"DIE!" Then the demonic laughter began. It echoed through Ruby's skull until she couldn't take it anymore, but suddenly, it stopped.

"What..?" Ruby asked out of sheer confusion and fear.

She saw a fireball form near Flowey and strike the plant, sending him flying. She reached for Crescent Rose, almost expecting to see Cinder, killing the plant so that she could kill Ruby herself. It wasn't Cinder. In fact, it appeared to be more like a kindly old woman... goat... monster... Okay, Ruby had no idea what she was.

"What a terrible creature. Torturing such a poor, innocent youth..."

Ruby stared at the kindly goat lady in speculation. She was grateful that this woman saved her life, but on the other hand, that flower acted nice before trying to kill her. The goat offered a hand to help Ruby to her feet. With slight hesitation, she accepted.

"Th-thank you." She replied somewhat shyly. Ruby isn't shy; she just isn't quick to trust this woman.

"You poor dear, you're hurt! Here, let me help you." the woman stated calmly, placing a hand on Ruby's head. She felt the pain from her head injury, and the pain from where the pellets hit her, disappear. She smiled at the woman.

"Do not be afraid, my child. I am Toriel, the caretaker of these ruins. I pass through this place every day to see if anyone has fallen down. You are the first human to come here in a long time. Come! I will guide you through the catacombs." She greeted, making a gesture for Ruby to follow her before coming to an abrupt stop. "Oh where are my manners, I almost forgot to ask you your name."

"I-I'm Ruby. Ruby Rose."

"My, Ruby? That's such a beautiful name."

"Thank you Ma'am."

"Please, just Toriel."

She turned and started walking towards a door.

"This way Ruby."

Ruby started feeling more trusting towards Toriel, but still felt weary. She stayed with her, but had Crescent Rose nearby in case something happened. They came across a room with two sets of stairs in it. In the middle of the room, Ruby noticed a small light. She felt drawn to it for some reason and walked to it. Reaching out, she heard a little voice in her head.

"The shadow of the ruins looms above, filling you with DETERMINATION."

Ruby felt a smile creep on her face. She felt determined all right. Suddenly the voice was heard again.

"Kill them all."

This scared Ruby. She didn't want to hurt anybody if she didn't need to. She was a huntress, a protector of those who cannot defend themselves, not a killer. She ran after Toriel, who was waiting patiently at the top of the stairs. Then they walked to the next room.

"Welcome to your new home, innocent one."

"Actually, I was just trying to find another way out... I have a sister, a dad, friends, and whatever Weiss is..."

Toriel grew silent for a moment, trying to ignore Ruby's statement.

"Allow me to educate you in the operation of the ruins." She continued, more irritated than before. "The ruins are filled with puzzles. Ancient fusions between diversions and door keys. One must solve them to move forward. Please, adjust yourself to the sight of them."

Ruby watched carefully as Toriel pressed the switches on the floor, thinking they'll come in handy.

"Don't bother. This puzzle will never be seen again." The voice spoke. Ruby was determined to figure out who this person was and what they wanted. Toriel lead her to another room.

"To progress through this room, you must trigger several switches. Don't worry; I labeled the ones you need to flip."

"Um, thank you Toriel..." Ruby noticed that Toriel was acting way too motherly towards her. Was she intending to keep Ruby? She'll just need to be careful. She walked over to the first labelled switch and pulled it. Toriel, who was standing and waiting, walked over to the next one with a smile. Ruby noticed two switches there and got confused. She pulled the switch on the right.

"No no, not that one my child. The one on the left. I even labelled it for you, see?"

Ruby nodded and pulled the other switch. Her face was a bit red in embarrassment. Toriel, however, didn't mind the screw up, and acted like it never happened.

"Splendid! I am proud of you Ruby!"

Ruby felt a pain in her heart at that statement. That sounded like what her mother would say to her. It's been so long, and the closest thing to a mother she had at the moment was some goat lady in a cave she just met. Sounds crazy when you say it out loud, right?

"Now, let us move on to the next room."

"Toriel?" Ruby asked, a mixture between sad and impatient.

"Yes my child, what is it?"

"How much longer?"

"Until we reach our home, about twenty minutes."

"I mean until I can go home."

"I just answered you."

"Toriel?"

The goat said nothing further on the subject. She simply kept walking. The next room contained a training dummy, and nothing else.

"As a human living in the underground, monsters may attack you. You will need to be prepared for this situation." Ruby jumped. Monsters will attack her? All she's seen are Toriel and the flower, who knows what other monsters could be down here, or how strong they could be? Ruby, needless to say, was terrified. Toriel noticed and continued. "However, worry not! The process is simple. When you encounter a monster, you will enter a FIGHT. While you are in a fight, strike up a friendly conversation."

"Wait what?" Ruby asked in confusion. This was a strange turn of events.

"Stall for time and I will come resolve the conflict. Practice on this dummy." She then proceeded to walk over to the door and block it, meaning that Ruby was not able to continue otherwise.

"Ugh, fine." She sighed, irritated. "Uh, hey dummy." She began, until suddenly her heart appeared in front of her again, just like before. Except this time there were different options at her disposal. She could: FIGHT, ACT, ITEM, or MERCY. She chose ACT. It gave her two options: talk, or check. She talked to it. "N-nice day, huh?" Toriel smiled and the encounter ended.

"Ah, very good! You are very good!" she praised, rubbing the top of Ruby's head. Ruby smiled as she flattened her hair back down. "On to the next room."

"The puzzle is in this room. I wonder if you can solve it?" Toriel muttered, walking to the next room. Ruby followed her, and was suddenly thrown into combat. In fear, she pulled out Crescent Rose and almost sniped the froggit in the head. Toriel looked saddened and scared at Ruby pulling a weapon. The voice in her head yelled "DO IT!" but she was ignoring it. She placed the gun/scythe back on her harness on her back, and pressed act. There were different options than before. She was able to compliment or threaten the froggit. She decided to compliment it.

"Uh... nice... eyes?" She said the first thing she could think of. The froggit looked confused, but also looked flattered. Toriel walked forward and glared at the froggit. It shuffled away in fear. Ruby sighed and smiled.

"Thanks Toriel. That was getting awkward."

"You're welcome Ruby. Remember, I will be here with you to resolve any conflict you come across, as long as it is in the ruins."

"What do you mean?"

"What do you think genius? As soon as you head past the ruins she'll leave you and stay behind. You'll probably never see her again." The voice in her head scolded.

"Who are you?!" Ruby yelled at it, but out loud by accident.

"My child, who are you talking to?"

Ruby realized her mistake.

"Uh, nobody. Let's keep moving." She replied calmly.

"Who are you calling nothing? I'm literally right here."

Toriel was just standing there, in front of what looked like a floor of spikes. She appeared to be thinking about something.

"Hmm... this is the puzzle, but..." then she turned to Ruby. "Here, take my hand for a moment."

Ruby took the kindly goat's hand and followed her steps carefully as she guided her through the puzzle. As they walked across, she noticed that Toriel looked saddened, but didn't pay any mind to it. Reaching the end, Toriel smiled.

"Puzzles seem a bit too dangerous for now. You have done excellently thus far my dear Ruby. However, I have a difficult request to ask of you. I am going to go through the next room alone, and you will follow when you receive the signal. It will be a feint beep, so listen closely for it. Forgive me for this." Then she walked away. Ruby listened closely, and then she heard it. Using her semblance, she zoomed to the other end of the room. Toriel walked out from behind a pillar.

"Greetings, Ruby. Do not worry, I didn't leave you. I was merely behind this pillar the whole time. Thank you for trusting me."

"How cliché." The voice muttered. For once, Ruby agreed with it.

"Toriel, what was this all about?"

"I was testing your independence. I must attend to some business and will be gone for a while. Stay here, it's too dangerous to explore alone. Here's a phone. If you need anything, please call." Then she left. Ruby was holding the cell phone, trying to figure out what it did.

"Is this the underground version of a scroll? Geez, they need better tech." She muttered, placing it in her pocket. Then, she proceeded to walk out of the room. "Toriel said it was dangerous to wander by myself, but I'm a danger magnet regardless of what happens. This is going too slow anyways." Suddenly her phone went off. She was looking all over it, trying to figure out how to receive a call. "Maybe this button..?" she pressed a little button with a green telephone on it. It was the right button. "Ah, there! Hello?"

"Hello, this is Toriel. You have not LEFT the room, have you?"

"No, why?"

"Because there are more puzzles I have yet to explain. It would be dangerous to try them by yourself."

"That's understandable. I don't know what may be down here, so traveling alone would be stupid."

"I'm glad you understand. Be good, alright?"

"Toriel, before you go, may I ask you a question?"

"Yes, Ruby?"

"How do I hang up the phone?"

"The red telephone button."

"Thank you." then she hung up. Not taking her own advice, Ruby kept walking. She saw another one of those little lights and walked over to touch it.

"Playfully crinkling through the leaves fills you with DETERMINATION."

"Ribbit ribbit! (Excuse me, human.)"

Ruby noticed a froggit trying to get her attention. She wearily walked over to it.

"Um, yes? May I help you froggit?"

"(I have some advice for you about battling monsters.)"

"That would be great! Thank you!" She smiled. A lot of these monsters are really nice. So getting through here alive shouldn't be too difficult.

"(If you ACT a certain way or FIGHT until you almost defeat them, they may not want to battle you anymore.)"

"Wow, thank you. That's very helpful. I'll keep that in mind."

"(If a monster doesn't want to battle you anymore, please, use some MERCY human.) Ribbit."

"Understood. Thank you."

"Ribbit. (You're welcome.) Ribbit."

Ruby used her semblance to travel at a faster pace. She was afraid it might take too long to travel at a walking speed, so she ran through the room. She noticed that there was a cracked floor and two vents. She assumed that you were to step on the cracked floor and fall, then climb up the vent, though didn't want to risk it. She used her semblance and gained enough momentum to jump over the cracked floor. Then she kept walking.

"That was almost too easy." She muttered. Walking into the next room, she got another call from Toriel. "Hello?"

"Hello Ruby. For no particular reason, which do you prefer, cinnamon or butterscotch?

"Um... Cinnamon, to be completely honest."

"Okay, and you do not dislike butterscotch, right? I mean I know your preference, but..."

"No, I don't dislike butterscotch." Ruby replied, almost annoyed. She could only imagine what Weiss would say to Toriel in this situation. 'You dolt! What was the point in asking if you clearlywant to use both anyways?' Ruby will never admit it (maybe) but she missed Weiss.

"And you do not have allergies?"

"No."

"Alright, thank you. And thank you for being so patient by the way." Then Toriel hung up.

"Right, patient." Ruby muttered to herself. Then she checked her scroll signal in the underground. It was enough to call. She immediately put a video call through to Yang.

"Ruby! Are you okay? Are you still underground?" The blonde asked in a panic. Ruby noticed that Blake, Weiss and team JNR was there too.

"Yeah, I'm okay. I'm still trying to find my way through. You wouldn't believe what's down here."

"What?" Blake asked in curiosity.

"A whole society. Remember in history class Oobleck told us about the war between humans and monsters?"

"You mean you actually paid attention in class?" Weiss asked sarcastically. Ruby gave her a dirty look.

"Yes. This is the same mountain. These are those monsters. They're so friendly, minus the flower that tried to kill me."

"You were almost killed, by a plant?" Yang asked in disbelief. Her face was like 'really bitch?'

"Yes. Anyways, if I'm gonna make any more progress down here I'm gonna have to keep moving. May I ask a favour though?"

"Yeah, sure. Anything."

"I need you to research this symbol for me." She stated, sending the picture to her sister. "Also, I don't know how much longer my scroll is going to have a signal, so this may be the last time we talk before I leave the underground. I will see you guys later. Yang, Jaune, I love you."

"Love ya too, sis." Yang replied, a tear present in her eye. Jaune walked forward and took the scroll from her.

"I love you too Ruby. Stay strong, will you?"

"I will." Ruby smiled, hanging up.