This is a powerful OC fanfiction, that means that this oc is very skilled and powerful, if you do not want to read this then close this tab, if you however want to read it then by all means, please read it.

Just a heads up the OC's name is Onyx Obsidian this name is for the RWBY universe and uhh his real name is Oblivion O. Onyx, it is an unoriginal name, I know, what with my name being The Oblivion Overlord, but hey. It's my OC so… I do what I want with him.

"Normal talking and shiz"

'Thoughts and bunch'

"YELLING or voice coming from a helmet."

Disclaimer: I do not own RWBY in any way. Monty does and God bless him.

Prologue

In a store, an individual of 12 ft in height with black spiky hair and with three locks of dark purple tipped hair framing the sides of his face, he has a unique eye color with black color iris that has a purple middle circle with a glowing red pupil, clad in black armor with dark purple lining and designs is at the dust store, buying a LOT of fire dust and earth dust.

"Alrighty, I think this is all… Yep. This is all I'm gonna buy. Soo… How much?" The figure clad in armor asked the old man at the counter.

A little shocked that this person would buy a lot of dust in the first place just slowly said. "Uhh… that will be… 3500 Lien please."

The figure just place a sack of 5000 Lien on the counter. "Ok, there is 5000 Lien in that bag old timer. Its ok. You need it more than I do."

Shaking his head the old man said. "But… I can't accept this much! Its only 3500 Lien please!"

We see the figure trying to convince the old man. "Come on old timer. Its fine, really! You will need it much more than I do. I will not leave this place until you accept it."

Sighing at the stubbornness of the person in front of him. He had to relent. "Very well. Thank you for paying."

Nodding his head the armored man started packing the dust containers and crystals into his storage space for later. Shocking the old man that apparently this person has an inter-dimensional storage space for his own use. However as the old man looked away from the strange person in front of him he sees a group of shady individuals slowly walking to the store, he eyes them cautiously.

-Meanwhile in another part of the store-

'Hm… I wonder what would Yang like from these magazines?' Thought a black haired girl with red tips in her hair with silver eyes with black headphones on her head and wearing a black and red... gothic dress and a cape/hoodie? She has an expandable sniper scythe on her hip in its holstered mode.

She is currently browsing through a few catalogs, trying to find one that she thinks her sister will like. When she suddenly felt a hand on her shoulder.

Turning back to see a guy in a black tuxedo, with black fedora and black glasses. 'Is it black Friday? Oh wait, that is for sales I forgot.' Snapping out of her thinking mode, she sees the man motioning to take off her headphones.

"Uhh… Yes?" The girl asked.

"Hand over your things!" The man said.

"Uh… are you robbing me?" The girl asked confused.

Palming his hand over his face the guy who is apparently trying to 'rob' her exasperatedly said. "YES!"

The girl just responded. "Ohh…. Ok."

They both suddenly heard an explosion at the front desk, with that as a cue, the girl backflipped onto the wall and using the wall, she jumped and kick tackled the guy out of the store, looking to her right she sees a huge guy clad in black armor grabbing guys with the same clothing in the face and throwing them around like ragdolls and smashing them with his gauntlet covered hands.

-Ten minutes earlier at the counter-

The armored man just finished putting away the dust canisters and crystals in his pocket dimension when he felt someone bumped into him from behind. "Apologies." He told the guy behind him without looking, as its difficult to look behind him with his height.

The man in white with orange hair and a black bowler hat just motioned two men behind him to grab the guy and toss him out. Not really thinking much about the guy's height they tried to do just that. Keyword tried they couldn't as they tried pulling the guy in different ways, eventually the armored man noticed what they were trying to do and backhanded the two men out of the door.

"Now that wasn't nice… Why did you do that?" The armored individual drawled standing up to his full height.

The orange haired man said slowly. "How about we start over… My name is Roman. Pleasure to meet you..."

The black armored man smiled. "Nice to meet you, my name is On..." He was interrupted by a shot to the face he fell backwards and hit the floor.

The old man behind the counter got scared at the gunfire and the apparent 'dead' body of his last customer.

"Now… old man give us the dust. All of it." Roman began.

The old man behind the counter started putting the dust crystals in the bag, while the goons went to the dust containers and started filling up their canisters with it.

Roman thought. 'All according to plan' When he felt a tap on his shoulder. "Hey, douchebag." Looking behind him, he saw nothing but black as his face got grabbed and he felt himself being lifted up and thrown out the door. Lifting himself up he looked back to see the giant of a man he shot earlier but now he has a helmet with a single glowing red eye in the visor. He saw him launching a red energy like grappling hook from the palm of his hand that separated and attached itself to the goons who were taking as much dust as they can.

Roman then saw the giant give a harsh pull of the energy like rope and watched in a little fear that ALL of the goons attached to the hooks were pulled toward them.

The armored man pulled them and launched the goons out of the shop. "Hey old timer, you can close up the shop and call the cops, I will handle these fools."

Walking out to the front slowly and menacingly, the giant slammed his hands together. "You know? I never did tell you my name, after you oh so rudely interrupted me, well, allow me to say it. My name is Onyx Obsidian, and you are gonna have a bad time." A strange jet pack materialized onto his back out of nowhere. Using his booster pack, the newly named Onyx flew to the goons grabbing the faces of two men in each of his hands he swung them around like dolls he threw one to a group of goons that were too close to each other knocking all of them down from the force alone.

He then swung the guy in his other hand using the guy as a weapon against his own allies, breaking a few bones. He then threw the guy into a mailbox, the guys head was inside and his butt is sticking up like an ostrich.

Onyx then proceeded to beat up the guys with his hands, grabbing their heads and smashing them together, when he heard a crash coming from the store he was in before. He saw another guy already knocked out and he saw a little girl in black and red dress with a red cape/hoodie? He then saw her look at him, a little confused at what she was doing here, he called out while smashing a guy's head to the lamppost beside him. "Hey little one! What are you doing here?"

The girl just stood up like nothing just happened and just introduced herself. "Hi there! My name is Ruby Rose and this guy was apparently trying to rob me so I just kicked him." Ruby finished with a nonchalant and innocent smile.

Everyone except Onyx, in the vicinity that is not knocked out sweatdropped at her casual and innocent answer, all the while thinking. 'Are you serious?'

Slamming two other guys into the pavement, he also introduced himself. "Hello little Ruby, my name is Onyx Obsidian, and I am beating these guys up for trying to steal from the old timer's shop and for being very rude." Gaining another round of sweatdrops from the aforementioned people. 'Are you kidding me?!'

Ruby then asked. "Oh! Can I join?" Just as she said that she grabbed her weapon and span around as her weapon started to transform from its holstered mode, ending in a scythe she stopped spinning and pointed the weapon at them.

Onyx thought about it a little. "Hmm… Alright! Come on!"

- A major beatdown later -

"Welp, that's done." Onyx finished by clapping his hands and dusting himself off.

"Yep, they were a little slow." Ruby agreed as well, carrying her scythe on her shoulder.

Looking to the right Onyx saw the douche who shot him in the face. "Hey! That's the douchebag that shot me in the face!"

Ruby looked at where he was looking and saw the guy. "Huh? Well that was rude of him to do that."

"Yeah it was, not to mention he is the leader of this group. I'm gonna go bash his sorry face in." Raising an armored fist he started using his booster pack to fly up there.

Ruby not wanting to be left behind, started using her semblance to jump and run up the wall to reach the top of the building. "Hey! Wait for me!"

Arriving at the top Ruby landed in a crouching position with a leg outstretched to the side and her scythe outstretched to the other side with her head down. While Onyx landed in a kneeling position with a fist to the ground and his head also down. They simultaneously raised their heads and got into their stances, clearly ready for whatever douchermcpushover will throw at them.

"Hey douchebag! Did you forget us?" Onyx yelled out making the orange douche stop and turn around.

After a moment of silence, they heard a loud whirling noise, a bullhead just rose up behind Roman! The douche started to chuckle. "Hahaha! End of the line red, and black!" Laughing a bit more, the douche then jumped into the bullhead.

Ruby is a little worried. "He is going to get away!"

Onyx yelled out. "Not on my watch!" He raised his hands up and quickly bringing them down he formed two giant glowing red energy like harpoons, he then grunted and threw the harpoons creating a line of lighter red energy, the harpoons successfully pierced the bullhead and Onyx started pulling the ropes slowly, slowly pulling the bullhead, clearly not having too much trouble with the mass of the vehicle.

Ruby is amazed by this guy's strength, however she saw something orange out of the corner of her eye, she saw a lady in dark red holding a glowing ball of fire in her hands. She saw that she was about to throw it at Onyx and Ruby can tell that Crescent Rose bullets are not strong enough to disperse those balls of flame yet, she can't do anything to prevent it.

However out of nowhere a beautiful woman in a teacher's uniform and purple cape with light blonde hair tied in a bun with a small strand down the right side of her face with green eyes and wearing glasses, walked up to the bullhead using her semblance lifting the many stones, pebbles and rocks around the vicinity, hell Ruby can see a few huge chunks of rocks from the beatdown she and Onyx gave to the goons earlier.

The woman used her semblance to form a rock and stone wave to block the attack from the woman, however the woman is not going to give up, and she created a stream of liquid flame? At the wave melting through it with ease and heading to Onyx.

Seeing the incoming danger, Onyx had no choice but to let go and dodge the attack, he tried to follow by taking to the skies however the woman who threw the attack at him thought ahead and quickly fired a big blast that will hurt Ruby and the woman, so again Onyx had no choice but to ignore the bullhead and head to the girls.

Boosting hard he landed in front of the girls and held out both his hands, dark red and black energy gathered in his hands, he then brought them together pointing at the oncoming blast, he then unleashed a massive beam of energy completely eradicating the attack into nothing. The blast receded and he relaxed as he turned around. "Are any of you injured?" Onyx asked with a little worry.

"I am unharmed, thank you for aiding us." The light blonde haired woman said professionally.

"Yep! I am fine! Thanks for saving us from that Onyx! By the way, how did you do that by the way? That was sooo cool!" Ruby yelled out, ending with sparkles in her eyes.

With a sigh of relief Onyx then proceeded to phase out his booster pack and helmet, showing his face.

"That was a relief, sorry Ruby but I will tell you later." Onyx said to the girl not seeing her pout at him, he started talking to the older woman. "Sorry for not catching them maám, but that woman lobbed an attack at you so I had to abandon the capture."

The woman was confused at the way he was talking to her. "Young man, I am not with the authorities..."

Surprised Onyx apologized. "Sorry, its just you have this professional aura around you that reminds me of a serious officer. Sorry about that. Anyway, my name is Onyx Obsidian, and the little one is Ruby Rose, what is your name miss?"

The woman just replied. "It is fine, and my name is Glynda Goodwitch, and I have to talk to you two after that display."

Ruby immediately paled, thinking that they were in trouble, however Onyx just nodded. "Very well Ms. Glynda, please by all means lead the way." He noticed Ruby slowly inching away. "Woah, woah, woah. Where do you think your going little one? Your coming with us, the pretty lady here just wants to talk."

Glynda raised an eyebrow at that remark. Inwardly blushing and a little flattered at that compliment, she thought to herself. 'Such an interesting boy.' They then started walking.

- Thirty minutes later in an interrogation room? -

Glynda was standing at the end of the table with Onyx and Ruby sitting on the other side.

"If it were up to me, you would get away with a slap at the back of your hand, but someone is here to see you." Glynda finished, she stepped aside to reveal a man in an unzipped black coat with a dark green shirt underneath ablack vest under it, wearing black pants and a dark green belt with black glasses, with silver hair and brown eyes, he is carrying two plates, one with cookies, and the other with chocolate.

He entered the room and sat down on a seat, opposite of the two and placed the plates in front of them.

"Hello. My name is Ozpin and you have silver eyes, and you have strange eyes." Ozpin said.

Ruby not knowing how to respond to that just said. "Uh… uhm. Thanks?" She then took a cookie, and nibbled on it like a cute squirrel.

Onyx responded. "Thank you sir, and you have nice hair I do say." He also grabbed a piece of chocolate, and tossed it in his mouth.

Ozpin smiled at that. "Thank you my good man. Anyway with that out of the way, do you know who I am?"

Onyx inwardly smiled at the prank he thought of. "Yes sir, you are Ozpin."

Silence reigned, and Ruby started laughing a bit, Glynda was trying hard not to laugh at what he just did, and Ozpin, well… His expression will be burned into their memories forever.

Ozpin snapped out of it. With a little tick mark and a twitching eyebrow. "Yes… I am Ozpin, but do you know who I am?"

Ruby decided to answer before Onyx decided to do anything again. "You are Professor Ozpin, Headmaster of Beacon."

Ozpin smiled. "Yes I am, and tell me who taught you two how to do those things, I do not know about you Mr. Onyx, but the only person I know who can teach you to wield one of the most dangerous weapons is an old Qrow?"

Ruby started to talk even if there was food in her mouth. "~Mumble mumble *crunch* mumble!~"

Sweatdropping a bit Ozpin asked her to clarify but Onyx did it for him.

"Well she said, she was not that good until she got trained by her uncle to use the scythe of hers, and I must say her uncle is good, if he can teach her to wield that weapon expertly."

Sweatdropping again. Ozpin asked. "How..?"

"Can I understand what she is saying? I already know the language of the mumble mouth. Yes its a language. Anyway I trained myself, when I found out about my aura and semblance." Onyx concluded for him.

Swallowing her food Ruby then said. "Yeah! I was complete poop at fighting before, but now I'm like Hiyah! Watchao! Hunyah!" She finished with kung fu.

Ozpin sighed. "Anyway, if you would be able to join my academy would you take it?"

Ruby yelled out. "Yeah!"

Onyx said. "Hmm… Yeah, it's not like I have anything else to do."

Ozpin then smiled. "Well then, welcome to Beacon, the flight will be at this address on this date."

The two blinked a few times. Finally they said. "What?"

Prologue end

This is my first RWBY story and I will try and update this with my other stories as fast as I can, anyway you have seen the strength of Onyx and you can see he is powerful.

Also the armor, booster pack, and weapons that he will be and is using is a MSN-06S Sinanju with the color scheme I wrote earlier. His semblance and aura I will explain in the next chapter when I post it.

Remember, if you want to review if I have any typo errors or if you simply want to compliment the story then go ahead be my guest, and any and all flames and insults I will ignore or erase.

Anyway this is The Oblivion Overlord signing out.