Disclaimer: I don't own anything in relation to the TYPE-Moon series or anything else.

"Unlimited Blade Works!"- speak/talking

'Feel our demonic wrath' – thought/ speaking in their minds

"We Won." – Angra Mainyu/ Madness

Chapter 0 Unforeseen Circumstances

The Nasuverse is a vast, ever expanding place where different worlds are born and creating with only a few details deferring between them.

The origin of the Nasuverse is unknown, almost seemingly unreachable. Most that had tried to find out about it had either been lose their way doing so or had simply gone mad.

For this story, we are focusing on a world very similar to many others in the sense that this story will start during the final of the Fifth Fuyuki Holy Grail War or more commonly known as Heaven's Feel.

There have been many variations with this particular war but like most stories, no matter what the changes are normally revolve around the set categories of 'Fate', 'UBW' and finally 'Heaven's Feel'.

This story focuses on a very similar but at the same time a very different ending to the 'Heaven's Feel' category, this is to show the possibility of Shirou Emiya, the protagonist for most of the Nasuverse's worlds being given a contact with the main antagonist for most Nasuverse's worlds, Angra Mainyu/ Avenger.

Shirou Emiya, the suppose hero for most stories at first had the goal to destroy Angra Mainyu, like most worlds however this world's Angra Mainyu had one last trump card to pull during it's 'death' that he had on Shirou Emiya unknowingly had ever since the fires of the Fourth Holy Grail War, fragmented pieces of the Fourth war's Grail.

But why are you listening to this old fool tell you a story? Why don't you all see for yourself?

Now we track back to that day where everything caused, The birth of Demonic Spirit EMIYA.

Fate: DSE

Shirou Emiya stood there, feeling prana entering him from the left hand of the servant, Archer the feeling slowly turning his mind to steel.

In the end Shirou Emiya has always been sword, sabers keeping his flesh together, shields for his mind, blades to protect his soul, it was because of his unmovable will that he still draws breath, because of his goals, desires, dreams…he no longer know what to call them anymore as he activated it, HIS reality Marble, Unlimited Blade Works.

A dangerous essence flowed into his being after all the flesh of both servant and human were never meant to join, Shirou Emiya was unknown variable for he should no longer draw breath, he should have died long ago but he will not allow it, not now or ever as he still needed to keep the promise from the one he cares most in this world, the one that give him new meaning and the one who he threw away his everything for, including his dream of becoming a hero for.

He had trouble thinking about her as he transforms into a living sword, but he didn't need to at this moment for now he simply needed to free her from his tainted chains and finally defeat the abomination that dare use her as a puppet.

He tuned out the outside world as he walk forward to his goal, but he at least knew that someone was trying to get his attention.

"Shirou…" a woman with long pale purple hair with an odd attire had gotten his attention, he had known this person, Yes he knew her very well but for reason he couldn't remember the servant's name, Shirou had stopped walking for a moment as he turn to her waiting for her to say something but no words came out of her as he closes his eye but for a moment

"Can you get them out of here?" he asked with bated breath, hoping this woman can honor his last request

"What about you?" She ask him as Shirou closes his eye before turn to face the thing he needed to destroy, fuelling his determination but even then he knew that he was going to die but without regret

"I'll destroy Angra Mainyu and finish this, get Rin and Sakura out of here ever second they stay here is a second too long." He had to make sure that at least they were safe no matter what, only then can he destroy that evil without fear

"Alright, I'll carry them both out of here, I have recuperated for that at least…" She said with confident look in her eyes, Shirou knew she had mean every world as he nods

"Please get out of here with them, this cavern is collapsing…" Shirou said as started walking on the path he had crafted for himself as the Servant look at him for a moment before speaking

"Alright…I'll get them both out of here then I'll be coming back for you." She said with conviction in her voice as Shirou look at her for but a moment

What she had just said was an impossibility, he was going to die and they knew it, his body was just too torn from both physical and mental exhaustion due to his left arm, there was no way she could save him from his fate.

"I'll get myself out of here, don't worry about me." He tried to reassure her somehow but even though he knew that she can tell that he was lying through his teeth, but thankfully, for him anyway she listened as she went to pick up the two girls and left the area

He didn't even look back on their progress as his mind and entire being was melted and converted to steel, as he continue forward, even though he wanted to see her again no matter what, he at least could be at peace knowing they were safe.

Shirou Emiya began his chant or at the least his version of Archer's chant as he prepare for his last hurrah as he call upon the powers of the servant as his prana began charging for his last attack.

'I am the bone of my sword.

Steel is my body and fire is my blood...'

While he was chanting, he saw his final obstacle, the man was bathed in the demonic glow of the greater grail, standing firm despite all that has happened.

"kotomine Kirei…." The man that had grafted Archer's arm to his flesh, he was similar to him in a way, he embodied the emptiness Shirou had possessed, the only difference being Shirou had cleansed himself from the emptiness while Kirei was still deep within it after all Shirou found meaning in life in the form of, her.

"So it seems we have both survive til this point, Shirou Emiya….i wonder what are you planning to do now?" the false priest said with his fake smile as Shirou stood still

The man was curious, even Shirou in his hazy melting mind could tell that but on the other end, Shirou couldn't even fathom why he stand there, almost protectively in front of the monstrosity.

"I'm going to allow this curse to be born." The mad priest said as Shirou stood there unfazed as his senses were dulled long ago

"You can't control him if he enter this world, Kirei." Shirou tried to reason with the mad priest but as Shirou expected; it had failed

"Of course not my dear boy, I have no intention to control it after all, I bless anything that comes to life while eliminating anything that seeks differently."

Shirou had long since stopped caring as he continues, "I destroy while you protect…? Hmm…no matter, we're going to die in any case….i die happily if it means destroying that monstrosity, but what about you?"

Shirou had predicted the priest's answer and it seems he hit on the mark.

"It is as you had said; I'm glad to die, so long as it's birthed as that is my purpose in life; to seek the misery of humanity and revel in it."

That was all Shirou needed to cement his decision to finish the mad man in front of him as he traced his twin blades, as he prepare for the end.

'-My whole life was unlimited blade works.'

Fate: DSE

Moments later, what was left of the now dead priest was now a slowly withering corpse in the way of his goal, but before he faced death with a smile, he gave Shirou a few last words.

"You are the last Master. Go to the Holy Grail, and fulfill your wish."

In those last moments, they came to an understanding between them as similar foes, more so than anyone could understand between them.

There was one last thing he needed to do as he held out his left arm as he prepare for it all to end.

"TRACE….ON..!"

He shouted as he used the strongest Noble Phantasm he knew, the weapon of his late partner, who had been corrupt by the grail like so many others, this was a last salute to her as the golden sword began to form.

So much dead, so much hate, so much sorrow has been caused by this thing as he couldn't help but clench his teeth in anger…If it won't for you!

It was too late when he realized the darkness that corrupted so many other before him had gather around him as pain started to consume his very being, but it didn't matter not to him anyway…he welcome it even as he shouted out.

"EX…..CALIBUR!" the golden blade slashed down, and an enormous blast of holy light engulfed the Greater Grail, as it used it last Ace in the Hole, the Holy Grail cease to existed as Excalibur dissolved from his hands as he fell into the darkness of the Angra Mainyu as it latched onto its new unknowing vessel as the current Shirou Emiya died with a smile while the new entity being formed within the shells of both Shirou Emiya and Angra Mainyu, started to form as an insidious laugh echo throughout the cavern.

"You lose…Boy…I've won."

End of chapter 0

Author's Notes: Heyo, readers this here is an idea I had for quite some time now as I decided to do this as one of the few new fanfic projects I been doing along sides with Guilty crown and a few others I plan to release.

First things first, I'm not really 100% sure on the Heaven's feel route as I never played/ seen it, so sorry if I changed a few details as I only vaguely knew about it story in a summary I've read about, and I may have used a few other fanfic stories as template for this chapter.

Second, I may as well explain a few things, this version of Shirou will not been the same as any of the fate stay night Route Emiyas or Counter Guardian Emiya as none of them truly 'hate' humanity more of this will be expanded on next chapter…whenever I do that…

Also this new Shirou will be a little OP in the sense that he is as powerful or more so then Gilgamesh at full strength …..maybe who knows but if it is then it is how it is.

Well see you all in a bit then!