Disclaimer: I do not own RWBY or Fate/Stay Night

...

Ruby did her best not to fall asleep during the history class, despite how up and go their teacher was (whether natural or from just the sheer amount of coffee he had digested was hard to tell) as he zipped around the classroom recalling various aspects of history he deemed important. She was simply glad that she wasn't the only one, mildly grateful at the same time that Weiss was the only member of their team taking notes. That however meant that she was free to sleep the lesson away and simply copy the notes at a later date, one where she wasn't bored to death.

Professor Oobleck adjusted his glasses slightly having noticed that the topic of the day seemed to be falling on deaf ears. The hyperactive teacher didn't blame them, at the moment they weren't learning how to slay Grimm or keep their weapon properly poised for battle. Oobleck allowed a sigh to escape his lips as he figured out the best course of action. While Goodwitch likely would have none of what he was about to bestow upon the young Huntsmen and Huntresses these were darkening times, as much as he wished to deny it.

History would be these students greatest weapon.

It just had to be in a more practical sense.

"Class," he nearly shouted, startling those that had been drooling onto their parchment. "Perhaps there is another topic on which I can discuss with you today, one which you wouldn't even learn about until your final year of study. The option is only given towards the end of your time spent here at Beacon Academy, and even then few choose to take this practical session into account."

There was a brief murmur around students and even Ruby Rose found herself brought back to the real world, the conversation Oobleck was saying much more entertaining than her daydreams of chasing Zwei through an open meadow. Once the murmuring died down slightly, Professor Oobleck spoke to the students once more. "There are many things that we can prepare you for in these halls but once you step foot into the real world your knowledge and experience are what ensures you survive. I won't sugarcoat it, every mission is dangerous, a simple scouting mission can soon have you fighting for your lives, perhaps even a fight you have no chance of winning. While this is a grim thought, it is a very real one."

"This practical is designed to teach you one of the few things that we as teachers are unable to do so. Participating in such an event is guaranteed to result in a failure from both a single and team point of view."

That got the murmurs started once more, much louder than before.

"Professor," said Weiss as she raised her hand diligently. "Are you saying that we don't have a chance in this practical?"

"Precisely," said Oobleck as he took a sip of his coffee. "The room is kept under heavy lock and key for both the wonders and the dangers that are contained within. The only way that you can gain access is by asking Professor Ozpin directly and having him approve for your team to step forward to face certain defeat."

"Professor," said Nora, not bothering to raise her hand like the Schnee heiress. "What's in the school?"

Her question was followed momentarily by silence as many students internally debating with what kind of Grimm monstrosity was lying in wait. "The room contains many and yet contains none," said the Professor cryptically. "Decades, perhaps even as far back as the creation of this school that room has resided. The spirits of heroes long since forgotten are trapped away in there, able to manifest themselves into physical form within the boundaries of the room. Likewise, any injuries sustained in that room are only manifestations within the room itself, as soon as you step out, or thrown out, you will find not a scratch on your body nor a hair out of place. You will know however that you suffered the utter taste of defeat."

"How are you so certain that we'll lose?" said Yang, feeling optimistic about fighting something so strong with no repercussions.

"I once had the same mind as you and talking with some of the other students tried to brace myself for the battle to come. The hero whom you will fight however is randomized so as far as our class was aware, none of us had battled the same foe. So we walked forward to fight an enemy we had no knowledge of and no tactic against. Fighting humans is far greater a task than fighting a Grimm, especially humans as powerful as this."

Oobleck adjusted his glasses once more as he saw that the class was now captivated on his every word. "We went in and the room we were in manifested into a barren wasteland and I still recall the chilling words I hear. 'I am the bone of my sword.' That was all the warning we were given before carnage began. As a team we fought and learned alongside one another for nearly any situation. When his arrow pierced through my hand it felt all too real. That was but the warning shot as he continued chanting, the words I can no longer recall, I had essentially gone into shock at that point. I do remember watching though as my teammates did their best to fight against him as he pitted his skills against their own, it was clear who the greater combatant was. Twin blades made of black and white danced in front of me before I tasted the cold taste of death."

Shocked gasps rang out as Oobleck gripped his glasses and cleaned them with the hem of his shirt. "We woke up in the infirmary, having been found unconscious outside the room," he continued. "It just went to show that we had a great deal more to go in regards to strength. My teammates though refused to even recognize the room's existence, feeling it was one of those things better left unsaid. I was not one to be denied though so I stepped forth into the room once more to make my stand, to better acknowledge my weaknesses."

"This opponent made her presences known, acknowledging both how courageous and foolish I was to step forth into her domain. I gave her no time to wield the silver chain she held, charging head forth into battle knowing that I was likely outclassed. I never imagined just to what degree. She played with me, laughing at my attempts to strike her before deciding to end the façade. I may have blocked six, perhaps as many as eight attempts at my life before she strung me up, the entire time she had been fleeing she had been preparing a trap. I expected life to fade from me once more, simply predicting she would end it quickly."

"I was a fool."

"What happened?" asked Ruby, leaning so far over her desk she threatened to collapse on the students in front of her.

"Dissection would be an accurate word as she tore me apart piece by piece, enjoying the sounds of agony, my cries of pain music to her ears. While you may not retain physical injuries you are by no means safe. Every now and again I can sense her chain tighten around my wrists as she plows a dagger into my stomach with such precision that she knows where the vitals are and how to avoid them. I hope you can understand just how dangerous this is and why so many students opt not to tread down this path. I did so solely because you can sometimes learn more from your losses than you can from your victories; and so ends todays lesson."

"Class dismissed."

…

"We have to do it!" Ruby proclaimed boldly, almost salivating at the thought.

"Are you kidding? You heard Professor Oobleck how dangerous that simulation is," exclaimed Weiss, wanting no part of the dangerous program.

"It's only damage that happens to our minds though," said Ruby believing that to be a perfectly respectable counter argument.

"It does sound like an amazing way to train," said Blake as she looked up momentarily from the book she was reading. For the better part she wasn't fazed by the prospect of fighting some of the theoretically strongest people that had ever lived. She would simply follow the team leader regardless of what her decision was. Thankfully with whatever decision Ruby made she felt that the consequences would not be dire.

"You're not helping," scolded Weiss.

"I bet there's one guy who shoots lasers out of his eyes and breathes our fire," squealed Ruby as her imagination got the better of her. "No no no, there'll be a guy with eight swords rapping as he fights us."

"How does one even wield eight swords?" asked Yang.

"Who cares, it'll be awesome!"

"Regardless of whether or not we want to do it, we still need to get permission from Professor Ozpin," said Weiss still trying her best to disarm the situation. "We're a group of first year students who are only just learning what it means to be Huntresses. Even if this training is as beneficial as it could potentially be, there must be a reason why only students in their final year are permitted entry."

Weiss' words seemed to hit the mark as she visibly deflated, the realization that they needed their principle of all people to allow them entry brought the situation back to reality. It was at this moment however that Nora came screeching down the hall, nearly tumbling over herself before she stopped mere feet away from where Team RWBY stood. "Guy's you'll never guess what we just got permission to do," she said, fists clenched together in excitement. "The only catch is that we need to take you guys with us. So come on, let's go!"

To the surprise of the members of Team RWBY, actually asking Professor Ozpin was seemingly all it took.

…

"So that was it, you just went and asked?" Ruby asked of her fellow team leader as the two teams marched towards their destination.

"Yea, well the four of us haven't actually had much practice fighting as a group yet so it seemed like the perfect chance," said Jaune, doing his best to hide the fear in his voice. The two teams were currently situated in what looked like an abandoned corridor, grotesque statues of grimm and other manner of beasts were lined up along the walls gathering more than their fair share of dust.

"Do you think that they deliberately prevent themselves from cleaning this area to make people second guess themselves?" Pyrrah asked of the two teams. "The statues are getting larger the further we go. The mere fact that we will be facing a seemingly unbeatable enemy while surrounded by these stone monsters would frighten many warriors."

"No kidding," said Jaune with a light chuckle.

"We started this journey as a team, it only seems fair that we see it through as a team," said Ren.

"Screw just seeing it through, we're going to win!" proclaimed Nora, swinging her Warhammer around as if it were nothing but a baton.

"Heck yea!" agreed Yang as she smashed her fists together, the ring of her gauntlets colliding with one another echoing around them.

Finally they reached their destination, a singular door at the end of the hall. Despite the rough shape the rest of the hallway looked the door itself was immaculate, intricate carvings decorated the polished oak painting the vivid brown color with splashes of gold and crimson. The handle was curved in nature and the silver texture glinted with the few beads of sunlight that trickled past the nearby grimm statue's head. All in all, it looked completely out of place.

"Well guys," said Jaune as he pulled a key out of his pocket. "Are we ready?"

The affirmative response was all that was needed for him to step forward and place the key in the lock, unlocking it and opening the door. It was surprising however to see nothing but an eerie white escape the room with no actual indication of there being much behind there. Of course that didn't stop Ruby from charging in alongside Nora, the rest of the teams quickly following before the door slammed shut behind them.

The members of Team RWBY and Team JNPR braced themselves as the battlefield they were expected to fight in formed around them, all of them tense and at the ready for the battle they were going to face. Yang was excited at the prospect, the idea of the challenge ahead exciting her down to the core.

As the white light dispersed they found themselves in an area they hadn't thought would be suitable for a war. Stone pavements lined the path as the combination of starlight and a few flickering lanterns bathed the world around them in a sliver of light. On either side of them was fog that was slowly dissipating into the night around them. "This is astounding," said Weiss. "It feels like we've stepped foot into a completely different world."

"Agreed," said Ren as he lowered his weapons slightly as he took the time to absorb the atmosphere around them. Even though it had been the middle of the day when they had stepped forth into this pocket dimension (he hadn't constructed a better phrase for the room than that at this stage) there was now a chilly breeze surrounding him on what felt like a cold autumn night.

"Wow!" squealed both Nora and Ruby, both awed by what the room was capable of.

"Guy's I don't like to be the bearer of bad news, but take a look around," said Jaune as the air cleared and the fog that had blocked much of their sight parted and revealed the landscape around them.

"Are those…" started Pyrrah as she realized just what kind of landscape they were standing in.

"Tombstones," declared Blake as the graveyard came into full view. Miles upon miles of tombstones lined up neatly caused her to swallow a lump that had caught in her throat. Her faunus instincts kicked into gear as she heard the sound of footsteps coming towards them. "Get ready!"

Her word was answered swiftly as the eight of them instantly remembered just what danger lurked within this world. "My, my, what young children have stumbled into my realm," said a petite voice as a small girl stepped into view dressed in a purple winter coat that covered her from the shoulders to her ankles. Hair as white as snow lapsed down her neck as she eyed them cautiously with red eyes. For someone they had to fight though she held no weapon in which to face them with.

"Umm, I think you're a little young to be calling us children," said Ruby noting that despite being the youngest one there their opponent seemed to be even younger still.

"Is that so," she said with a smile. "My name is Illyasviel Von Einzbern, might I know your name in exchange?"

"Ruby Rose," answered the leader of team RWBY, earning a light scolding from Weiss.

"Don't tell the opponents information like that!"

"Sorry."

"Ruby Rose," mused Ilya. "I think I shall have you die first."

The casual tone in which the child in front of them talked about death sent all of their alert systems to maximum. Instead of coming at them however she turned and started walking away. The words she spoke however were clear as day.

"Get them Berserker."

The two teams heard the monster that had been summoned forth before they saw him, his bellow ringing in their ears driving all of their attention upwards towards where the moon hung above them. Part of the illuminate orb however was blocked by the monstrosity rocketing towards them and it was only out of natural instinct that they all dove to the side, scrambling away as the creature landed right in the middle of where they had been standing, the pavements cracking under the weight.

It took a moment to compose himself as the eight students took the time to study their true opponent, all of them gathering that the girl was just the introductory part of this lesson. Berserker turned out to be a man wearing a leather tunic, though the term monster still seemed more appropriate. He was taller than the Ursa that lived in the woods and was far more imposing. Muscles upon muscles adorned the man's body giving none of them belief that they would be able to match him blow for blow. Hair as black as ash draped his skull as golden eyes scanned those around him. His weapon, for all it's intimidation value, was quite primitive being nothing more than a stone sword.

Somehow it felt far stronger than all of the weapons combined.

"Fire!" shouted Jaune, giving the command and snapping all of his friends out of their stupor.

Gunfire and Dust rained down on the man in an onslaught that would harm the mightiest of Grim, ammunition being expelled at the quickest rate possible. The man however simply stood there, not even acknowledging the mosquito bites that were irritating his skin. His flesh began to glow red as he roared out into the night before he charged forward, his target selected.

The speed in which Berserker moved shocked all of them and Jaune could only raise his shield in desperation as the monster struck at him. Despite successfully having blocked the blow Jaune was sent soaring through the graveyard, his body plowing through several tombstones before he finally came to a halt, coughing and gagging as blood dribbled from his lips.

One blow and his aura was depleted.

How strong was Berserker?

Yang was dying to find out.

Having sensed that long range attacks would do nothing, Yang had closed the distance between her and her target moving far faster than normal due to the seals that Weiss had placed beneath her feet. Leaping over a sweeping blow, Yang sent several explosives punches directly at Berserker's head but before she got the chance to celebrate the killing blow, Berserker's spare hand plucked her out of the air and tossed her aside like a rag doll.

"We need to disarm him," declared Pyrrah fearing that anyone struck by the stone blade directly would not be resuming the fight, Jaune was still struggling to get to his feet after having blocked a blow. A clean strike would likely end the fight right there and then and it was clear as he steadied himself that he knew it.

Ren started running around Berserker in circles, peppering his back with a multitude of bullets trying to get his attention to no avail. From his standpoint however he could tell that the beast of a man was aiming up his next target. "Brace yourselves," he shouted but it was seemingly too late as Berserker charged forward, his target clearly set.

Weiss' eyes widened as the behemoth charged at her before she put all of her training into action. She knew from the speed he was travelling that he was much faster than her so even if she tried to avoid the first swing of his stone blade there was no guarantee that she would avoid the second and after having watched Jaune get blown away defending wasn't even an option. So, she went on the attack. Spinning the chamber on Myrtenaster, she locked it onto the red chamber and prepared to use every grain of fire based Dust at her disposal.

She swung her blade and the explosion was deafening as Berserker was consumed by flames and she smirked. For all but a single moment as Berserker charged through the explosion with no sign of damage, his weapon raised high above his head. Weiss could only watch on in horror as the weapon was swung in her direction before she felt herself being forcibly shoved to the side. As she was pushed out of the way of the attack, her eyes watching on in shock as Jaune gave her the smallest of smiles right as the stone weapon cleaved him in two.

"JAUNE!" shouted Pyrrah as Jaune's body broke into golden fragments in a matter of seconds. It seemed to be the way the room showed that Jaune was sent back to the existence outside of this hellhole but everybody was seemingly in shock from having watched their friend die.

"One down, seven to go," Ilya's voice rang out in a singsong manner. Surprisingly it was Pyrrah who acted first, charging at Berserker and thrusting her spear at him as hard as she could. The weapon was batted away but Pyrrah did not lay up on her assault as she used the momentum to twist on the spot and create a small gash in Berserker's left leg with the tip of her spear. The tiniest of wounds to a mountain of a man but that was not the point. Every second that she could keep Berserker occupied was another second in which the other six fighters could come up with a way to defeat this monster.

Yang, meanwhile, exploded from the crater she had found herself in, debris momentarily floating around her as she looked at her target with bright red eyes. With him being currently occupied by Pyrrah, the blonde haired warrior sprung forth, crossing the distance within a matter of seconds with her gauntlet pulled back and a roar in her voice. She could faintly hear the voice of her sister call out to her but she paid it little attention as she threw all of her strength into her punch, connecting sweetly with the exposed jaw of Berserker.

All of her strength managed to move Berserker a whole three steps before he regained his balance and roared much more terrifyingly than when Yang had.

…

"Guys, we need a plan," said Ruby as Yang and Pyrrah continued on the assault, their combined attack keeping Berserker on the back foot for the moment.

"Anybody got any suggestions?" Ren asked of those nearby.

"I'll tag in with Pyrrah, my semblance should be able to keep him guessing," declared Blake.

"Go," commanded Ruby, the member of her team obeying her orders and charging forward knowing that a single misstep could result in her ending up like Jaune.

"Alright, now what?" asked Nora.

"If my last attack was anything to go by this man is basically unstoppable," said Weiss, still coming to grips with how close she had been to being bisected.

"We entered a supposedly unwinnable fight, we left all rights to complain when we entered this place," said Ren knowing that there was very little he could contribute to the fight at this point. Unlike Pyrrah's weapon, his utensils (which was what they deserved to be called at the moment) didn't have any sharp or serrated edges to deal any melee damage on the proviso he got close enough to actually attack Berserker.

"That's still not a plan Ren," said Nora.

"Buzzsaw," said Ruby slowly. The other three hunters and huntresses in training looked at her in confusion as a slow grin spread across her face. "Weiss, I'm going to need you to amplify the speed of Nora's hammer which is going to launch me at him, and while in the air I'm going to be spinning like a mad woman and maybe, just maybe, cut him down to size."

"That…could actually work," said Ren, understanding fully that he didn't have a part to play at the moment. He understood also that if anything were to go wrong he would be needed to ensure that everything remained okay.

A scream of pain ringing out from Yang informed them that whatever plan they had formed need to be enacted immediately.

...

Blake used her semblance at a rapid rate, shadows of herself appearing and allowing her to escape mere moments away from devastation. Despite her enhanced reflexes, she was struggling to ensure that she walked away from this battle. For so long all she had known how to do was run from injury, run from a fight. Now though was far different from any other situation she had ever been in. She was running with a purpose.

She had been unable to get Pyrrah out of the fight however.

Blake has instructed Pyrrah to back off, to let her and Yang hold Berserker back but Pyrrah hadn't paid any attention to it. Unlike the calm and composed warrior that she was, Pyrrah was fully intent on ending this battle one way or another. Her actions were speaking for her and her skill as a fighter was on full display. The problem was that she wasn't thinking of the bigger picture, and Blake had read enough sappy novels to understand why.

While Pyrrah was thinking that she was fighting to bide time, that was only the excuse that she gave herself. If what Blake was hypothesizing was right, Pyrrah wanted revenge. Revenge against Berserker for killing Jaune. They had only been partners for little more than a couple of weeks but it clearly mattered not. An act like this on the battlefield could wind up with her own or another comrades death. Blake would be sure to confront Pyrrah about this afterwards; regardless of the situation one should always think about survival before all else, for both themselves and those around them.

Her thoughts were shattered as she felt a giant fist crash into her side, Berserker having taken gut instinct over sight as he attacked where she had actually been and knocked her square into Yang, the two members of team RWBY crashing against a nearby tree that threatened to topple over.

Pyrrah continued to fight but it was clear that now it was back to one on one that she was losing ground. She was beginning to tire, her movements starting to slow while it seemed as if Berserker had yet to break a sweat. Her shield was knocked to the side from Berserker's latest blow and she could already see the follow up swing aim squarely at her. Feeling that this was the end, she struck out, her spear propelling forward and cleaving into Berserker's right eye.

That did little to stop his attack.

His howl of rage was the last thing she heard as death swiftly overcame her and she vanished from this world. Of course this was all the opening that the rest of the squad needed.

Ruby was propelled forward much faster than she could with her semblance, rotating as quickly as she could with her scythe outstretched. Blake and Yang in their crumpled heap could only watch as the whirling blur of red death crashed into and consequently through Berserker's collar, almost tearing off his arm in the process.

A painful roar escaped Berserker's lips as the light began to fade from his eyes, not before spotting one last target and launching his sword forward. Nora couldn't react in time but was thankfully spared a painful death by her aura having not been effected thus far. Having it all blown away in a matter of moments wasn't a pleasant feeling regardless.

Ruby, stumbled out of the nearby woods, barely able to stand up straight as she wobbled from side to side. "Did we get him?" she asked as she leant against an undamaged tombstone in order to remain upright.

"He's dead," declared Ren.

"But at what cost?" asked Blake of the group as she got to her feet, albeit with a bit of a struggle. Thankfully though Yang was there with her and they mutually agreed in silence to lean against one another. "Sure this is a training exercise but think about it, we lost two members and most of us are unable to put up anything reminiscent of a fight after this."

"I believe congratulations are in order," Ilya's voice rang out from nearby, her voice seemingly surrounding them making it almost impossible to pinpoint where she was. "To think that you were able to take away one of Berserker's lives."

"One?" repeated Weiss as all attention shifted back to the behemoth of a man, watching in horror as his wound stitched itself back together and eyes shot open as life returned to him.

"One down, eleven to go, good luck."

As the remaining members of Team JNPR and Team RWBY braced themselves, Berserker rose to his feet, his mere presence causing the ground beneath him to crack and split. Not a single wound from the previous battle remained upon his body.

Berserker roared.

…

Jaune stepped back into the hospital ward, seven flowers gripped within his hand, one for each of his friends. He had been first to awake, having found that true to Professor Oobleck's prediction, someone had managed to stumble across him and his team while they had been unconscious and had brought them here.

He had yet to discover how the rest of the fight had gone, none of his allies having awoken before he had gotten the all clear. Considering that they had all been asleep when he had gone to collect the flowers he could only imagine how the battle had concluded.

That Berserker though, that was something else entirely. If that truly was the embodiment of a hero from years gone past he felt sorry for all those who crossed its path. The sheer power radiating off of him when he hadn't even gotten serious was terrifying, it had only been through horror that Jaune had ordered everyone to open fire. Every part of him wanted to flee from that fight but he had been able to tell straight away that if he had lost sight of the battle he would have been slain in an instant.

It was terrifying.

As he turned the corner, Jaune was pleasantly surprised to find that the other members of both his team and that of Team RWBY had awoken yet it was eerie as they all sat in silence. Jaune felt that he already knew what they were all thinking about. He could tell from their expression that the rest of the battle had not gone to plan. He had felt weak, helpless, the only good thing he had done was save the life of someone who would have been able to provide better support than him.

It clearly hadn't helped in the greater scheme of things.

"Hey guys," said Jaune in as cheery a tone as he could to try and lighten the mood. He found it odd that Pyrrah was the person to react the most to his comment, pushing herself off of her bed and marching straight towards him and wrapping him up in a hug so tight that threatened to bruise his muscles. Being the clueless teenager that he was, Jaune had no idea how to react at first before he fiund his arms circling around and embracing Pyrrah. "Thanks," he said weakly, not really sure why he was receiving the hug in the first place.

"Aww, you even got her flowers," said Nora spotting the brightly coloured flora currently held within Jaune's hand. Her comment seemed to get Pyrrah to release her grip almost instantly before she looked at the flowers.

Jaune wanted to say that he had gotten one for everyone but at the moment it only seemed right that he do what his male intuitive was demanding of him. "They're for you," he said softly, Pyrrah taking them from his grip and clutching them tightly.

"Thank you," she said in little more than a whisper before quickly scurrying back to the safety of her hospital bed.

Even though the atmosphere in the room had been raised by Jaune's simple act of kindness, all thoughts soon returned to the horrors of the room they had previously entered. Deep down, despite how much they wished to say otherwise, they all knew that it wasn't the last time they would face such a monster.

They had gotten a taste of the strength of a true hero.

There was no telling what the strength of the next hero would be like.

…

Hope you enjoyed.

I love both RWBY and Fate/Stay Night but have never actually come up with a good enough story to be put in either world. So as I do in such cases, I smash them both together and see what creation I can make. It seemed fitting, to me at least, that Beacon Academy would have more training facilities than what was showed during the season so I tried to incorporate that kind of idea and this is what happened.

Not sure if I'll continue on to be honest. More likely than not it would just be random one shots incorporating students vs heroes but with my ever changing mindset that could be thrown out the window as of tomorrow.

Regardless, let me know what you think and perhaps what kind of matchups you would find enjoyable. See ya.