In this What is Waver was born Three years earlier and The Fourth Holy Grail War started two years earlier though the result ere same expect Shirou being 5 years old when the fire broke out

A Red Hair kid looked as he instead of fainting on he rubble he kept running as soon he saw a man and tried to go there but a portal opened as Black mud fell on top of the kid as just the Unholy Black fire erupted from the mud engulfing the kid

"Gahhhhh" The kid let out a pain filled scream as the Black mud started dissolving him while the Fire brunt his body and Soul as the mud also in it's twisted way kept him alive to keep torturing him only leaving him in the cusp of death and filling the kid's head with a dark voice

Theft, robbery, kidnap, suicide, rape, arson, bombing, homicide, selfishness that takes away being fortunes, civil war, Misdiagnosis, concealment, violation for benefit, Selfish murder, theft, crime, crime, personal grudge, attack, attack, attack, attack, dirty, dirty, dirty, you are dirty, atone, atone, atone, atone, every violence, every crime, every victim, atone for everything. This world is ruled by something not human. Know the conscience to reform crimes."

DIE! DIE! DIE! DIE! DIE! "DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE!" I WANT TO DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE!"

"MURDER, TORTURE, SUICIDE, THEFT, KILL, BUTCHER, CANNIBALISM, CRUCIFIXION, ADULTERY, BEHEADING, GENOCIDE, HOMICIDE, PURGE, DISEASE, MANSLAUGHTER, SADONISM, HEDONISM, NECROPHILIA, CLEANSING, SLAVERY, MURDER, BURNING ALIVE, EXECUTION, PRISON, PLAGUE, DEATH!"
DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE! DIE!"

POV Kiritsugu

Kiritsugu ran as fast as he could. Moments earlier, he had been digging through rubble when a scream pierced the air. He followed the sound, arriving at the scene in horror. A child's head was visible above the mud, their body horrifically melted and barely held together. One small hand was reaching upward.
Without hesitation, Kiritsugu grasped the child's hand and pulled them from the mud, ignoring the searing burns on his own skin. He quickly retrieved Avalon, inserting it into the child's mangled torso. A torrent of golden energy erupted, enveloping the child. Before his eyes, the boy's body was restored, and the injuries vanished.

The child gasped for air, alive once more. Wasting no time, Kiritsugu scooped him up and rushed to the nearest hospital. as soon they were treated as after a few days Kiritsugu decided to Adopt the boy and named him 'Shirou Emiya' but not before telling him he was a Magus ad they now moved into their new homes

Back to present

Kiritsugu looked as Shirou for the first time showed emotion as he looked annoyed and ran away from the Teenage girl Taiga

Taiga looked at him "Shirou is a bit weird"

Kiritsugu nods "Well he did survive the fire and he remembers other burning but nothing else"

Taiga nods "Why not take him to a Psychologist i hear they fix brain or so they say"

Kiritsugu hums "That might be a good idea"

Three days later, Psychologist "Sir i think the Fire left too deep of an impact what he needs is a purpose"

Kiritsugu nods "A Purpose huh"

At evening, Kiritsugu looked at Taiga as he finished their English Lesson

Taiga smiled "All done"

Kiritsugu nods "Taiga this is not really on our topic… but can you think of this as a game and try answering a few of my questions? You know, just like how you give advice to your juniors and friends."

Taiga grins "Oh, you are being shy again this time~ Or maybe you are trying to test my debating skills here? Ayyyyy, fine! Come at me!"

Kiritsugu nods "Hmm… Alright. Let's say there's a boy who comes to you, asking you to teach him Kendo. Not because he loves Kendo or extracurricular activities, but because he wants to get stronger. His only motivation is strength. What would you do?"

Taiga tilted her head "Hmmm… That's not so rare. Plenty of freshmen join the club with those kinds of motives. But…"

"There's a twist," Kiritsugu interrupted. "At home, he has a real katana within his reach. His family is careless, and he can take it out anytime. If you teach him Kendo carelessly, he might use that katana and hurt someone one day. So, what would you do?"

Taiga furrowed her brow, her playful tone giving way to seriousness. "So, locking up the katana or throwing it away isn't an option here, huh? You're just testing how

I'd handle it as a Senior of Kendo club member right?"

Kiritsugu nodded. "Exactly."

Taiga straightened, a mischievous glint returning to her eyes. "Alright! I'd teach him Kendo since Even if I reject him he might just pursue Online Lessons or resort to even worse methods so i will teach him kendo but only the swings No footwork, no sparring, nothing but swinging. I'd make him do ten sets of a hundred swings every day, rain or shine. Morning and night, without fail!"

Kiritsugu raised an eyebrow. "Is that… even Kendo?"

Taiga grinned "Nope I will just teach him some nonsensical essence of Kendo. PAM PAM! I will only make him focus on swinging shoulders and tell him to imagine swinging towards a grandma's shoulder, massaging her and I will teach him the worst way to handle a Shinai where it'd fall off every time even when he swings seriously"

Kiritsugu nods "Ahh I see what you did there"

Taiga nods "If he practices so much nonsense, no joy only misery, plus 0 signs of getting stronger, he'd definitely give up as long he's not a massive idiot and I bet he'd say something like 'Kendo is useless'. Then that'd make him understand that sword will never bring him any good and case closed. But then… if he started thinking like 'If sword can't do it, then I'll go for guns' and went astray, then that'd be outside the concern of a Kendo practitioner and then I'll have to look at the case from the perspective of Fuyuki's justice but that'd beat the purpose of this question, wouldn't it?

Kiritsugu "Hmm true that. To be honest, that was a really unexpected answer… Which means that you'd 'deceive' him, huh?"

"Well, it's only fair," Taiga shot back. "The kid's motive is fraudulent, after all. He doesn't want to be a swordsman; he just wants strength. My approach would help
him realize his mistake in the most sincere way possible."

Kiritsugu's expression darkened slightly. "And what if he believed every word you said? What if you didn't want to betray his trust?"

Taiga's grin softened. "Even if it hurts, I'd still guide him down that 'wrong' path. Sometimes, the only way to correct misconceptions is to let someone walk the road themselves. It's harsh, but it's the fastest way to clarity. Besides, lectures and nagging rarely change anyone's heart."

"And all the effort he put into that 'nonsense' Kendo… it'd just be wasted time?"

"That's fine," Taiga said with a shrug. "Time wasted is what youth is for. Call it a tuition fee for life lessons."

Kiritsugu's eyes narrowed. "But what if he never realizes it's nonsense? What if he follows that path to the end?"

Taiga's smile widened. "Then that'd be a very amazing thing to witness, So i'd praise him. If he invests his time and passion into something and sees it through, then it's no longer nonsense but rather a whole new path different from that of a Kendo the boy has mastered, he will become a charismatic figure that developed a swinging technique that tests one's undying will. "

Kiritsugu leaned back, slightly impressed. "And you think such a person wouldn't harm others?"

"Of course!" Taiga laughed. "If he has become such a figure then they wouldn't have room in their heart for ill will. I'm pretty sure he won't harbour any ill feelings towards his Master that thought him such a 'nonsense'. Everything would work out in the end!"

Kiritsugu smiled faintly. "You're amazing, Taiga-chan. Really something else."

"Heheheheh, stop it! You're gonna make me blush!" Taiga puffed up her chest. "If you keep flattering me, I might just end up getting a teaching license! What would you do then, huh?"

Kiritsugu shook his head, a small chuckle escaping his lips.

Few minutes later

Shirou looked at his Father "What is it old man"

Kiritsugu hums "Shirou, once Taiga returns home, can you come to the Dojo for awhile i will start your lesson of Magecraft"

Shirou eye widen "Eh? O-ok"

At night,

The sound of the starry night reverberated as Shirou sat on the Dojo Floor "Hey Old are you really going to teach me some Magecraft"

Kiritsugu nods "Yep. Shirou I will only teach you within my capabilities. But the content might not be what you wished for. I'm pretty sure you will be disappointed. If you got tired of it, don't hesitate to stop, ok? I know I have been saying these a lot of times, but this exercise, is truly unnecessary"

Shirou smiled "It's fine! I just wanted to be able to do what you can do, Old man"

Kiritsugu hums "Listen, Shirou to learn Magecraft, is to depart from common sense. We die when the time comes. We kill when we have to. That is our true nature. We do not live by the living, we live by death. Magecraft is something that destroys oneself from the inside. There's no other way around it. What I'm going to teach you is something that would stir more conflicts than not. And so… never use it in front of others and it's also quite difficult so you should take the practice seriously."

Shirou nods

Kiritsugu looked at him "The most important part of a Magecraft is You mustn't use it for your own sake. You can only use it for other's sake with that Shirou You may be able to use Magecraft but you will never become a magus."

Shirou blinks "I see It sounds complicated but I more or less understand now. I never wanted to be a Magus, I just wanted to learn Magecraft from you, Old man. So
I'm fine! I'll listen to what you have said."

Kiritsugu nods "Good. Let us start from the basics of basic. First you project an image of your entire body, from your organs, to your fingers, to every single nails, even to every strand of your hair and manipulate them. You must learn to retain that level of focus concentration first."

Shirou blinks "The first step sounds rather hard old man"

Kiritsugu nods "Of course you have to rework your body into the equipment to use Magecraft. Then think of a word that'd become the trigger to raise your concentration level to the maximum. Just like how you push a button, you need that one word that can flip your consciousness around. You need that one strong word"

Shirou scratched his head. "Is that something like… a magic spell?"

Kiritsugu gave a small nod. "Not far off. It's a spell meant only for you. A word that has a deep meaning, a word that will motivate you. It's something that will resonate in your heart."

Shirou frowned, trying to find the right word. "Hmm… I see… but it still hasn't come to me."

"You don't need to rush," Kiritsugu said. "It's just a word that should be persuasive to you, and you alone. Project the image of your body, and declare your virtual consciousness. Your double, as if you're going to trace it, and observe it."

"Trace" Shirou asked, slightly confused.

Kiritsugu nodded. "It roughly means to copy something"

Shirou murmured to himself, trying to grasp the idea. "Just like how you press a button… just like how you flip a switch… to trace yourself…"
"Yep," Kiritsugu affirmed. "Take your time. No need to rush."

Shirou nodded slowly. "Understood… 'Trace'... Trace, huh?"

One month later, Raiga sighed "Are you sure you have to go it only been a month since yo adopted Shirou"

Kiritsugu nods "This is an important and my last job"

Raiga nods "Don't worry me and Taiga will take care of Shirou"

Kiritsugu smiled "Thank you" as he went to Shirou room

Shirou looked up "So you are leaving"

Kiritsugu nods "Only for a few days"

Shirou hums "Can you get me books on Magecraft then"

Kiritsugu sighed as it was one the mystery he never got as someone Shirou was able to activate his circuits even with the Nonsense he taught the kid as he figured that Shirou circuit must have activated previously when he used Avalon that rebuild and filled Shirou body with its energy and he ended up activating it again by accidently forming a 'Trigger' for his Circuits

He nods "Fine i'll get you a few book on Magecraft"

Shirou smiled "Thanks"

After a Few days,

Kiritsugu glared "Acht give me my daughter back"

Acht scoffs "You will never see your daughter again Emiya and if you try i will eliminate her regardless if he is our most perfect Homunculus or not"

Kiritsugu glared

Acht sneered "I would normally kill you but i know not seeing your daughter will cause you much pain now you throw this man away"

Why do this why keep her she is of no use to you

Oh but she is far more than you know

What do you mean

Seeing you are a dying man let me tell you

Kiritsugu eye widen

Oh don't be a fool Emiya i know you visited that Healer i have to say quite a nasty curse Gilgamesh work i presume so live the rest of you life knowing you daughter is now mine, Gove live the rest of you agonizing life in misery, now take him away.

Kiritsugu snarled "You"

Acht looked at him "If you want your new son to survive then give you"

Kiritsugu eyes widen

Acht scoffs "Of course we know you didn't change your name everyone know by now, Throw him out now"

Soon the Homunculus threw Kiritsugu past the border and erected a Bounded field as he got up when he heard footstep and saw his newly hired partner Kairi Sisgou there

Kairi looked at him "You look like shit Emiya"

Kiritsugu glared at the man "Uhh help me get up"

Kairi did

Kiritsugu looked at him "Did you get them"

Kairi nods "Yeah yeah i did i got Six Homunculus three battel type and three caster type plus i also took their weapon also one of them is still alive"

Kiritsugu nods "Good let go find me a healer and then Atlas"

Kairi nods "As long as you pay buddy"

One week later, Kiritsugu looked as Shirou was practicing Kendo something Shirou picked up when living with Taiga

Shirou stopped "So how did i do old man"

Kiritsugu nods "Very well for someone practicing for barely two weeks"

Shirou nods "So what about the Books"

Kiritsugu took out a suitcase "I have it here and more"

Shirou looked at him more

Kiritsugu nods "I hired someone to trin you"

Shirou tilted his head "What about you"

Kiritsugu sighed "I am not suited to train you but that man is he will be here by tomorrow but i need something from you in return"

Shirou nods "What do you need old man"

Kiritsugu looked at him "I need you to rescue my daughter you sister"

Shirou blinks "What"

Kiritsugu nods "Let me tell you all about my life and why i have enemies and about the Moonlit world"

The next day

Shirou walked into the dojo as he saw a Old women there

Kiritsugu signaled him to come closer "Shirou meet Aurora she is an Exorcist/Executor who became a Burial Agency member and your new teacher for Seven years"

Aurora nods "So you are my student huh well let's get to work"

Kiritsugu sweat dropped as he knew the women was a Sociopath and sadistic Teacher but he though she would at least wait for him to finish his explanation

Shirou nods "Ok"

Kiritsugu stood up "I will also be training you on using Guns along with Tactics and strategy while Aurora will teach you Church Magecraft and Combat of all forms she is one of the best Martial Artist in world"

Aurora shrugs "No need for such praise"

Shirou looked at them "What now"

Aurora hums "Now run around the house until the say stop"

Shirou nods

After a while, Shirou fell down from having run so much as his legs were now numb

Aurora snort "Only this much i expected more" as she took out her cross and touched it Shirou as he glowed green and got up

Shirou stood up "What was that"

Aurora held her cross "This is a Supreme Mystic Code used for Healing now give me Push-ups like this" as she showed how to do push up

At night, Shirou looked at his father "Old man why do i have to train so much"

Kiritsugu hums "Shirou you need to possesses a superhuman trained body to support the load of firing Spell repeatedly and for superhuman close combat in future combat situations where you have run out of Od which is very important"

Shirou nods "Ok"

Kiritsugu looked at him "Good now let start on lessons on how to use Magic circuit to Draw Mana from the Air and use it to fuel your Spell and after this lesson's on Anti-Magus tactics"

Shirou nods "Will i learn any new spell"

Kiritsugu hums "Tomorrow we will start lessons on Formalcraft"

A While later

Shirou looked at his father sleeping as he closed his eyes and turned his nerves into a Magic circuit le gritting his teeth as he the touched him and analyze his Body as he found the circuit engraved on his Back as he analyze them and how they connected to something immaterial through the Brain as he let it go

Two years later

Kiritsugu coughed "Shirou i am going to my Healing session you keep practicing"

Shirou nods "Yes"

Aurora grabbed Kiritsugu and helped him got on his feet as they both took a cab and went to meet the Japanese Healer

A While later, Shirou looked as he finished the Formalcraft Magic circle for Healing as he the took out a Live chicken and sacrificed it as the Magic circle lit up as he stepped in and then started turning his nerve into a circuit as he then used the Od he got from it and used Reinforcement Alter and Alteration at the same time to change another Nerve to now match the circuits on his father back

"Gahhh" Shirou shouted as he felt more pain the ever and then he felt something click in him as he fell on the floor and activated the Magic circle as he felt his pain sooth as he the analyzed himself and found he now had one Magic circuit that used his brain to bypass and connect to his soul

He smiled "I-I did it"

After two days, Shirou looked as he laid naked on a Magic circle "So what dose this do"

Aurora smiled "Supposedly this determine your Elements we have two more for Sorcery traits and Origin your father was going to do this but he got curse so i have been learning this Emiya Familia ritual" [P.S Kiritsugu Father is said to have found out his Origin and named him Kiritsugu based on it so there must be a way to find it when he was a Toddler ]

Shirou nods

Three rituals later, Aurora looked at him "You have dual Origins of Creation and Sword with the Elemental affinity of Curse, Flesh, Fire and Sword along with the sorcery traits of Wisdom, Materialization, Curse, Curse-&-Sin Eater, Sword, Supreme Healing, Barrier, Absolute defense, Reinforcement and Alteration sheesh no wonder you are limited one of you Origin and Element is aligned anyway now we know what books to get you"

-[P.S Avalon is said to have changed his Element and Origin slowly after it became inert in this Shirou had Origin of Creation and Hallow along with Elemental affinity for Earth, Fire and Ether(Basically a Blacksmith who also had an affinity for making dimensional storage) as due to the Mud it was changed to Creation and Curse with Elemental affinity for Curse, Flesh, Fire and Nothingness as he had aligned Origin, Element and sorcery trait of Curse but due to Avalon it first changed his element of Nothingness into Sword and then his origin of Curse into Sword and gave him other sorcery traits but it has not fully overpowered all of his soul yet ]
Kiritsugu nods as he thinks [Sword huh that an Odd Origin and Element it cant be a coincidence i wonder if that's because of Avalon maybe i should ask Aurora advice]

At night

Aurora looked as she touched Shirou chest and pushed her energy as soon a Golden ripple formed as a sheath materialized

Kiritsugu nods "That's it"

Aurora took it out "What now"

Kiritsugu held out his hand "Now i hide it"

Aurora gave it to him

The next day, Shirou looked at them "So this will be my first mission"

Kiritsugu nods "You will just snipe the Magus from afar is anything happens run"

Shirou nods

Aurora looked at him "You will start doing mission with Executor one you are 9 so Two years later and when you have been Deputized as a Freelance Executor"

After a few weeks

Shirou looked at the ton of Books

Kiritsugu looked at him "These are books on basic of Healing Magecraft, Fire Element Magecraft and books on curses useful in battel plus books on Alchemy since

Aurora suggested you may be able to use you power to change anything into sword to attack other like Heine Istari dose"

Five years later

Shirou looked as his father grave who had died One year ago

Aurora put her hands on his shoulder "This is where we part ways as well"

Shirou blinks "So this is the end"

Aurora nods "Sadly this is or final day of training"

Shirou shook his head "You training will be missed and is this the last time we meet" as he did not display much emotion being Empty from the Fire plus both

Kiritsugu and Aurora had trained him to be ruthless, calculating, stoic, and cold-blooded though Kiritsugu also told him to always protect his Loved ones and that "Boy who makes girl end up in ruins" while Aurora trained him to have Faith in himself and have an Iron will no one could break

Aurora nods "Now like your father i am dying as well" as she held out her cross

Shirou blinks "You are giving it to me"

Aurora nods "Better used by someone that lying in dirt with me also take my ring it fire an Invisible Curse that can affect spirits"

Shirou nods "Thank you" as she took the Cross and her Ring

Aurora smiled "It was nice training you kid" as she walked away

Shirou looked at the cross as he casted his spell 'Analyze' while dividing it into Ten Steps

Analyzing the concept of creation.
Analyzing the basic structure.
Analyzing the composition material.
Analyzing and Learning the skill of its making.
Analyzing the experience of its growth.
Analyzing and Recording the accumulated years.
Analyzing and Recording the Mystery present on the Item Analyzing
Recording the Concepts Imbued into the Item Analyzing
Recording the power of the Creation
Analyzing every manufacturing process
Shirou closed his eye absorbing the information about the Cross and its power

At night

Shirou was in the Ryuudou Cavern as he had been using the Cavern to do his Formalcraft rituals since they had Laylines intersecting beneath them to supply Mana to the Greater grail which he had tapped into for his own proposes

He did the final stroke and finished the Ritual as it was a Formalcraft ritual designed to heal his body but not revert the change he had done to his nerve but rather help sooth his nerves as he based it on the Healing Magecraft he learned from the book's his father wrote as according to his father it was Alchemy based healing done to lessen the great burden felt by a subject who received an organ that was tempered with Magical Energy and help his body get used with the newly transplanted organ

Shirou looked as he started the ritual as he then started changing nerves into Magic Circuits again

"Gahh" he screamed as even after the conversion he did monthly plus the torturous training he did the pain he felt turning his new nerves was immense mainly since that nerve was connected to one of his sensitive Pain receptor

After a while

Shirou laid on the ground panting as the ritual was healing his body as to district himself form the pain used Analyze on the line on the floor which were the Greater Grail Magic circuit as soon he reached the Great Grail as but chance due to presence of his Magical energy that was currently being converted using he energy he got from the Ley-lines a chain reaction had started as the whole cavern lit up

The Grail tapped into the reservoir of Mana and performed it's main function and opened a small gate to 'root' which Shirou energy touched as Shirou felt a pull and he saw darkness and then he felt his body float forward as he kept going forward as soon his feet touched ground as he started running towards anywhere endlessly as after a while he felt the ground disappear of his feet as he started falling and then he saw a Bight light as Infront of his eyes was a Blue Spiral of pure energy as he felt moving closer and closer. Soon he was almost touching it but not as curious he casted his spell Analyze as he felt as if his mind was exploding

Just then a beam of energy shot out from the spiral and hit him as he felt pain like never before as he was now constantly moving around the Spiral for what felt like an eternity as he then jerked back as soon he landed somewhere as he looked to see the Ground and sky were made out of Blue mist as he looked around just then he saw a Red Shadow appears as soon the figure was Infront of him

"$#*&&*&%#$%" Shirou could not understand what the being said but he could tell the being held power he could yet not understand as he then felt a jerk as he opened his eye's as he saw the ritual was still conducting as unbeknownst to him his Body and both Circuits had changed from being so Close to Root plus it had stabilized and completed his special Magecraft and Reality Marble [P.S it is stated that a Magus can get Close to the Root to stabilize their own Magecraft in a Hurry]

"The Hell kid" a voice reverberated