Kiritsugu Emiya didn't expect this.

He was supposed to summon King Arthur, and he was pretty sure that King Arthur shouldn't have white hair, steel-colored eyes and tanned skin.

What had gone wrong? He used Avalon as a catalyst, no one except King Arthur or maybe Mordred should have been summoned.

"Who...are you?" Kiritsugu gave voice to his thoughts, Irisviel looked as bewildered as him if not even more.

"I'm Servant Saber, upon your summons I have come, I shall ask, are you my Master?" The Servant now identified as Saber said.

"Yes, I am." Kiritsugu, who had already recovered from the unexpected Servant appearance said. "Now, Saber, what's your true name?"

"I don't know" The swordsman replied. "Something should have gone wrong with the summoning ritual, as my memories are more than just a little fuzzy"

"Will this be a problem in battle?" The Magus Killer asked.

"I doubt it. My memories might be confusing but I can tell that my power isn't affected at all"

After that, Kiritsugu took his leave and left Saber alone with Irisviel.

OOOOOOOOOO

Honestly, Saber had a hard time believing his current situation. Not only he was summoned in the Fourth War but he also took HER place and was summoned by Kiritsugu of all people.

Saber lied about his memories. He knew very well who he was in life.

He was Shirou Emiya, The Second Magus Killer, someone with a sealing designation because his Reality Marble. But above anything else he was a Hero, and the one who put him in that path was his father, Kiritsugu Emiya.

Now, Shirou was going to do everything to reward his father, being the best Servant he could hope to be.

"Master seemed angry..." Saber sighed.

"Oh don't worry about it, Kiritsugu expected to summon King Arthur so he might be a little disappointed, but I'm sure it will pass soon" Irisviel, Kiritsugu's wife reassured him.

Saber knew that Kiritsugu was married before adopting him, but he didn't expect his father's wife to be like this.

She was like an older version of Illya, her white hair, red eyes, beautiful face, even her way of dressing was the same as Illya's.

Saber couldn't help but feel a little sad when looking at Irisviel. She reminded him too much of how he failed to save Illya from The King Of Heroes all those years ago.

"Do you think so?" He wanted to reward his father for everything he did for him, even if this Kiritsugu didn't save him yet, he was still his father.

"Yes, don't worry Saber" Irisviel told him. "So, Saber...Is it true that you can't remember anything?" She asked

"...It's not like I don't remember anything, but my memories are fuzzy and I can't concentrate in them" He lied, but Irisviel didn't need to know.

"I see..." She said, it was obvious that she still wanted to talk to him, but didn't know what to talk about or how to talk to someone like The Servant Of The Sword.

"Kiritsugu and Illya seem to get along, huh" Saber muttered to himself while he looked through the window to some kind of garden, where Kiritsugu and Illya were playing something.

Irisviel heard him but didn't say anything. When did Saber meet her daughter? It shouldn't have been possible for him to know her name, he didn't put a single foot out of the room they were currently into. So...how?

'What a strange man you are, Saber'

OOOOOOOOOO

Saber watched as his Master's car took it's leave from the castle. Kiritsugu was going to Fuyuki first in order to prepare everything for the war.

Saber and Irisviel were supposed to do the same one day later.

Needless to say, Saber didn't like the idea. Kiritsugu was a Master, and if another Master-Servant pair ran into him he would be dead.

Kiritsugu had to promise Saber that if he ran into trouble he would summon him immediately to make this possible, and even then Saber had been stubborn to not let him go alone. Kiritsugu had to threaten him with using a Command Seal to stop Saber's protests.

Only when he couldn't see the car anymore Saber entered the castle again.

OOOOOO

Hell

That was the only way Kiritsugu had to describe it.

Everything was on fire. Men, children, buildings, pets, everything was reduced to ashes.

Screams for salvation could be heard everywhere. The scent of burned flesh was in the air.

And in the middle of all this hell, there was a single boy.

He kept walking through the hell hoping for salvation, but the person inside the body was already dead.

It could be seen in the boy's golden eyes. He was just an empty vessel, he wasn't a person anymore.

When the boy's legs gave up and Kiritsugu wanted to go after him to save him, to do something, two men spoke behind him

"Hey, that's hell you're walking into"

One looked like an older version of the boy, and the other one looked like his Servant, Saber. And Kiritsugu couldn't help but feel that they looked strangely alike...

And then, Kiritsugu woke up.

OOOOOOO

"Bye mommy! Bye Saber!" Illya said while she waved her hand

"Bye Illya!" Irisviel replied.

"Goodbye, Illyasviel" Saber said with a little smile on his lips.

It was the day, today Saber and Irisviel were going to Fuyuki to meet with Kiritsugu and officially start the Holy Grail War.

Irisviel was going to act like Saber's Master while Kiritsugu stayed behind providing support if needed.

Saber actually liked that. In the battlefield, information is the key. If you don't know something so simple about a Servant like their class or Master you will be as good as dead. And if you can discover their true name then you might have another advantage. In the end, information is something really important in the Grail War like in any other War.

So, if the enemy couldn't find who Saber's true Master is they would have a considerable handicap.

And considering that was impossible for them to learn Saber's true name (Not that Kiritsugu knew it anyway), Kiritsugu was going to have a really good advantage.

After all, if you take down the Master then you take down the Servant too.

OOOOOOOOOOOO

After the flight to Fuyuki

"Sorry about the clothes, Saber, but you would be far too noticeable with that red 'overcoat', yes I think it was called like that, of yours"

"Don't worry about it, I don't mind at all"

Saber was currently wearing a black business attire, he never liked them but that doesn't mean that he disliked it. He truly didn't mind at all.

"I'm glad to hear that then...Oh, Saber, the car is already here! Come!" Irisviel said while running to the car

'She even acts like Illya sometimes'

Saber thought while sighing.

OOOOOOOOO

When they were traveling through the streets of Fuyuki City, Saber couldn't help but notice the look in Irisviel eyes.

"First time in the city, I presume?" Saber asked with a little smile.

"Yes, this is actually my first time out of the castle!" Irisviel replied with an amount of exciment that wouldn't be out of place in a child.

"Really? I mean, you don't stuck me like some kind of hermit" Saber said in a teasingly humor.

"No, no. It's not like I don't want to go out of there, but father would be angry if I did" She said.

Saber didn't know what to do with that reply. In one hand she didn't seem upset but in the other hand he shouldn't have brought that topic at all.

Should he apologize...or not?

In the end he did the first thing that passed through his mind.

"Please stop the car" He told to the driver while opening the door.

"Saber? What are you-?" But she didn't have time to ask her question as Saber took her out of the car grabbing her hand.

"If this is truly your first time out of the castle, let me show you the world then!" Saber said while running with his left hand grabbing her's

"R-really? But...if we get lost? What would Kiritsugu said?"

"Ah, don't worry about it, we won't get lost, I promise. And about Master getting angry? He would probably encourage you to follow me so don't think to much about it.

"A-are you truly okay with this, Saber?"

"Sure, let this job to your incredible Servant" Saber said with a smirk and started running again.

"Okay!" Irisviel replied while running with him.

OOOOOOOO

While they were walking through the riverside, Saber noticed something.

"Another Servant, they are near. How should I proceed, Irisviel?"

"Let's go after them. We should take down any enemy Servant as soon as possible."

"...As you wish" Saber said and they started walking towards where Saber have sensed the other Servant.

OOOOOOOOOO

The energy came from some kind of container deposit. Probably this place was used to keep everything that arrived from the sea.

In the middle of it, there was a man with two spears in his hands. Gae Dearg and Gae Buidhe Saber noticed instantly. Thanks to his Structural Analysis and Unlimited Blade Works he could tell everything about any weapon with just looking at it.

They were exceptional Noble Phantasm.

Gae Dearg was a B-rank Noble Phantasm that could make any magical enchantment or constructs useless temporarily such as Bounded Fields, his armor or projections with just one touch.

Gae Buidhe was a B-rank Noble Phantasm that any attack infringed by it could not be healed, not even magically.

And their owner could only be one person, the Irish hero Diarmuid Ua Duibhne.

Saber wasn't going to take him easy at all.

"Lancer, I presume?"

"And you should be Saber, you're the first one to take my challenge. Such determination could only belongs to the Saber class"

"You're right," Saber said and turned to look at Irisviel "Irisviel, be careful. I can't find his Master anywhere and I can't protect you while I'm fighting him"

"Understood. Saber, I can support you with healing magecraft but that's all I can do, please be careful"

"Don't worry, let this to your amazing Servant" Saber said while smirking.

"I am the bone of my sword"

The moment those words were pronounced, a limitless wall of blades could be seen in the sky.

Swords, spears, axes, daggers, every kind of bladed weapon could be seen in their numbers.

"W-what is this?!" Lancer said,

"I was going to have a fair fight with you, but with Gae Dearg and Gae Buidhe I cannot take that luxury, right, Diarmuid Ua Duibhne?"

"H-how could you?!"

"Let's just say that nobody understands blades as I do"

"Sword Barrel: Full Open"

And with those words, the limitless blades descended all at the same time towards Lancer.

OOOOOOOOOO

'What kind of monster did the Einzbern summon?'

That was the only thought in Kayneth El-Melloi Archibald's mind as he saw what Saber was doing.

Lancer didn't have a chance. Kayneth saw as Saber's blades flew towards Lancer and destroyed him.

He blocked a few, that was certain, but Saber's blades were at least a thousand.

In the end, Lancer got impaled by dozens of swords and fell to the ground.

After that Kayneth escaped praying that Saber couldn't see him.

OOOOOOOOOO

Kiritsugu couldn't believe what he was seeing. Not only Saber discovered Lancer's identity just by looking at his spears, but he also killed him summoning THOUSANDS of swords in the air and made them fly towards Lancer.

Any possibility of Saber being Arthur was destroyed in that moment, however, Kiritsugu wasn't disappointed at all.

'It seems I was wrong about you, Saber'

OOOOOOOOOO

Rider didn't like what he was seeing. He was going to watch how Lancer and Saber fought until another Servant appeared and then show up, but it seemed that wasn't going to happen.

In one moment Saber spoke and in the other one Lancer was dead.

Rider couldn't hear what Saber said, but whatever it was just after that appeared thousands of weapons in the sky, and all of them flew towards Lancer killing him.

What kind of monster was Saber? Was it his Noble Phantasm? It was similar to what Waver told him about the one who killed Assassin, however here there wasn't any gold light at all.

Was it possible that Saber and the one who killed Assassin were related somehow and their Noble Phantasm was alike? Perhaps, but he couldn't be sure.

However, killing Assassin should have been easy to any Servant, but to destroy Lancer that easily? Very few could claim that honor.

What should he do now?

OOOOOOOOOO

Tokiomi Tohsaka was left speechless after Kirei's explanation.

Not only Saber's stats were amazing (That was to be expected, though) but he also discovered Lancer's identity just by looking at him and had a Noble Phantasm similar to Archer's.

What could he do against such a monster? Assassin would be useless and he couldn't be sure if Archer would win if he and Saber fought.

What should he do now?

OOOOOOOOO

"Irisviel, we should be going. I can feel two Servants more coming here and I can't be sure if I will win shall I fight against two Servants at the same time."

"Y-yes, we should look for Kiritsugu" Irisviel said. "So, Saber...was that your Noble Phantasm?"

"My Noble Phantasm? No, it wasn't. That technique is called Sword Barrel: Full Open but it isn't my Noble Phantasm"

"Really? Then, what's your Noble Phantasm's name?" She asked.

"...My Noble Phantasm is called Unlimited Blade Works or in Japanese Mugen No Kensei

"Infinite creation of swords...Yes, I think Kiritsugu won't be angry anymore"

After that, Saber and Irisviel found Kiritsugu and Maiya and escaped to the Einzbern Castle in the forest before any other Servant arrived to the battlefield.