A/N: This fanfic is inspired by Remnant Warriors, a SW/RWBY crossover fic written by Magnus9284. Go check his profile for good stories to read, though note he's currently on a hiatus for the time being. Granted, I haven't watched RWBY yet, but from the fics I have read about it, there seems to be a good reason why there are fics to alter the story line.

That aside, let us begin!

12/6/19: Just made a quick edit on a typo.

Prolouge

June 1582, Honnou-ji

A lone figure clad in black plate mail contemplated all the events that led to this moment; his rise to power, the subsequent betrayals he suffered from those he called allies, and then the betrayal by one of his most trusted generals, Akechi Mitsuhide. Calm and collected, he remained uncaring about the fact these were the final hours of his life.

Around him, the temple he and his men lodged into was set alight in flames, leaving no way out for the defenders as the traitor general's men slaughtered all that stood in their way, leaving nothing to chance in order for the traitor general to see his plans come to fruition; hundreds of soldiers were burned alive or skewered by arrows, all gates surrounded, screams of panic and hate filling the air as the bloodshed ensued.

Oda Nobunaga, known as the Demon King of the 6th Heaven, stood poised to face his traitor general one last time in mortal combat, ready to face his death with courage and pride as was befitting of a samurai. By his side was his faithful bodyguard, Mori Ranmaru, a young boy that had seen too much bloodshed for a boy to see, his nodachi as his side as he prepared to follow his liege to his death.

"Nobunaga!" They heard a voice shout, and a nearby door was kicked down to reveal a man charging in, none other than the traitor general, Akechi Mitsuhide, with his katana at the ready.

"Nobunaga-sama! You must escape now!" Ranmaru shouted, nodachi at the ready to cleave any intruder that dared touch his liege lord.

"There is no need, my time has come to an end, and I will not run from it," Said Nobunaga, the calmness in his voice completely out of place with the current situation.

"There is nowhere you can run to, Nobunaga!" Shouted Mitsuhide, katana at the ready, "You will no longer sow wanton destruction wherever you go, you will no longer run rampant destroying entire clans, or sow chaos within the land!"

"Ha! So you finally have what it takes to be a lord! Are you any better than me, slaughtering the families of my soldiers?" Asked Nobunaga, dark energy covering his sword as he prepared for his final duel.

"If I am to be blamed for such a crime, then I will willingly take the blame," Said Mitsuhide, his resolve never wavering, "But know that my desire will not change! I will destroy you and your clan, and restore the country to its former glory!"

"Poor Mitsuhide... condemning himself to live without the guidance of our lord," Said Ranmaru with a condescending tone, his nodachi at the ready.

As the three of them prepared for the final battle, however, it was not meant to be, for the roof above them could not last a second more and collapsed upon them, trapping the warriors in a fiery tomb. The last thing they saw was the intense flames falling upon them and an intense light blinding their sight.

IIOII

Nobunaga stirred awake, opening his bleary, heavy eyes to inspect his surroundings. What he saw was not what he expected; he was supposed to be dead, was he not? If so, why was he not in heaven. The environment he was in could be best described as 'limbo', a term from the western religions he had read about.

He was surprised to find that in this 'limbo', he was not alone. Beside him was his faithful retainer, Ranmaru, and two other people he did not expect.

One was a man clad in white priestly robes and armour, his face one of steely determination, a large double-edged longsword in his hands. The other, also a man, was clad in red armour and white Katabira underneath, wearing a red kabuto over his head with white fur adorning its back like a wig of hair, a mask obscuring his facial features. In his hands was a single paddle fan, not the choice of weapon favoured by most samurai, but Nobunaga knew better than to underestimate him.

Nobunaga recognised them as Uesugi Kenshin and Takeda Shingen respectively, both of whom were his mortal enemies back when he was still alive, carrying out his campaign of dominating the whole of Japan. For them to be here...

"You..." Muttered Kenshin, brandishing his weapon, "Never would I have thought to encounter you, Nobunaga. Or you, Nemesis."

"Neither did I, and for Nobunaga and his sadistic retainer to be here..." Shingen stroked his chin, as if in deep thought, "It would seem someone has decided to gather us here, for what purpose I know not."

You are correct on that assessment, Said a deep, booming voice that carried power and steel, Indeed, I have brought you all here, for I have something to tell you.

The voice was so powerful, it was enough to give everyone pause. Even Nobunaga and Ranmaru - brutal personalities however they were - could not help but involuntarily tremble at the words of the entity that spoke to them, primordial power filling their senses and threatening to overwhlem them as a bright shone in front of them, eventually dimming to reveal a man garbed in samurai armour, a trident in his hand. However Human he looked, everyone could tell from the powerful aura radiated by his person that he was anything but a mortal.

"And are we to believe you are the god who brought us here?" Asked Kenshin, curious as to the entity's identity.

I am not one of the gods, nor am I a messenger of the heavens, The entity said, making no motion whatsoever, I am merely one of many powerful souls that exist in purgatory, the transitory state all souls pass through before entering the heavens or hell.

"If I might be permitted to ask, what is your name? Why were we brought here? We died, did we not?" Nobunaga inquired, not out of disrespect but curiosity.

You are not wrong, Nobunaga, Said the entity, Indeed, all of you are dead. I am known by many names: Bentei, the Lord of Vengeance, Friedheim, to name a few. However, you may call me Magnar.

"Magnar? Not a suitable name for one who assumes the form of a samurai, I might say," Said Shingen.

This is but one of many forms I assume when communicating with mortal souls such as you, Stated Magnar, As for the reason why you are here, you four have all suffered untimely deaths, either having done great deeds or aspired to do so. Therefore, I offer you all the chance for a new life.

A new life? That seemed particularly tempting to accept. Yet, personal experience told everyone present that nothing was given for free; there had to be a catch to this.

"I believe you want us all to perform a task for you, am I right, Magnar?" Nobunaga inquired, seeing where this was going.

Indeed, you are correct, Nobunaga, Said Magnar, Indeed, I wish for you all to do something for me.

"What will it be?" Asked Kenshin.

In another world, one that is plagued by an eternal darkness constantly encroaching on civilisation itself, a plot is being hatched by its agents to destroy civilisation itself, and extinguish the light permanently. To prevent this, four white knights will bear the destiny to stop its advance, and save that world from certain destruction. In the process, however, they themselves will be sacrificed in the process, and lose their lives and humanity in the process.

"So that is what you want us to do then? To save these four white knights from certain doom and this other world in the process?" Asked Shingen, to which Magnar nodded.

Of course, I am not forcing you into this, and you may choose to decline if you want, Reassured Magnar, However, just know that by accepting this offer, you may also gain the chance for a new life. So what will it be?

They had begun to think carefully about the offer presented to them; as Magnar said, accepting this offer was not mandatory for them, and they could choose not to accept this new life, and ascend to the afterlife. However, they had to admit, the prospect of being able to live a new life, away from the troubles of their home of Japan, of having to act as Lords of their clans, was certainly tempting, to say the least.

Having made up their minds and nodded to each other, Nobunaga then said to Magnar, "We accept your generous offer."

I am happy to hear it, Said Magnar, as he continued, To better prepare you for your task ahead, you will become younger so as to more easily fulfil your mission. Your bodies may also undergo other physical changes, though what exactly they are remains to be seen.

With another wave of his hand, Magnar sent wisps of light their way, and as the three older samurai were engulfed by these wisps, they instantly felt a deep rumbling settle in their bodies, not unlike when they unleashed their Musou against their enemies.

Go now, and may fortitude be with you wherever you go, Said Magnar, a genuine smile visible on what could be seen of his face.

Soon, a bright light shone where they stood, and the figures of Nobunaga, Ranmaru, Shingen and Kenshin, all vanished, having been sent to the other world to fulfil their task as ordained to them by Magnar.