AN: This is my first fic so I apologize if my writing is shit. I have read a lot of fics here and I decided to do a Karna!Naruto fic. This is probably the only one around so I hope you enjoy it!

WARNING: Has spoilers for Fate/Apocrypha.

I do not own Naruto or the Fate series.

"Normal Speech"

'Thinking'

Technique

"Heroic spirit/Demonic speech"

'Heroic spirit/Demonic thought'

CHAPTER 1: The meeting and flashback

October 10th, 5 Years after the Kyuubi attack:

" KILL THE DEMON!" roared a member of the mob that was chasing around a young boy who looked to be around 5 years old. He was a very small, malnourished boy with pale skin, dull blue eyes and short spiky whitish-silver hair(1), which was matted with blood and grime. He was wearing simple black shorts and a black T-Shirt, which was riddled with holes and burn marks. But what made him stand out was the whisker marks on his face. This was Naruto Uzumaki, the Jinchuriki of the Kyuubi no Kitsune, the Nine-Tailed fox that attacked Konoha 5 years ago.

"PLEASE! WHAT DID I EVER DO TO YOU!" He screamed as they appeared to be catching up to him, due to his tired body not being able to handle this level of stress.

" YOU KILLED OUR FAMILIES! THAT'S WHAT HAPPENED! NOW COME HERE AND LET US FINISH OFF WHAT THE FOURTH STARTED!" Said the leader of the mob, who was an ex-Chuunin. His family was killed when one of the Kyuubi's tails and now, he wanted revenge. And what was a better target than the demon itself, stuck in the form of a little child.

As he was running, Naruto spotted an alley nearby and ran into it. Unfortunately, it turned out to be a dead end and now he was trapped there."P-Please d-d-don't h-hurt me..." he whimpered as the mob surrounded him. They were wielding all sorts of weapons. Pitchforks, torches and some even had kunai and shuriken.

"Now now demon, be a good thing and let us kill you.." Another member of the mob said, as they approached the boy, when suddenly, an ANBU wearing a dog mask dropped in from above."What are you doing here?" said the ANBU as he approached the group leader. The mob immediately tensed at the sight of the ANBU. Now they were sure that they were going to be punished.

"W-We were j-just trying to k-kill the demon here and a-avenge our f-families" stuttered out the leader as he knew who the ANBU was. The legendary Copy-ninja of the Leaf, Kakashi Hatake. He prayed that the ANBU would buy it.

"This is wrong, all wrong" said Kakashi, making the mob tense even more and making Naruto relieved as he thought that he was about to be saved."You ... are supposed to do it.." hand signs were made and the sound of birds chirping was heard. "... LIKE THIS" roared Kakashi plunged his lightning encased hand into Naruto's stomach, who coughed up blood and immediately passed out afterwards. The mob immediately cheered and praised Kakashi for ending the demon's life. Under his mask(s) Kakashi was smirking. He had finally avenged his sensei by killing the demon that took his life. Little did he know that this night would be the night of the greatest change in the nations.

NARUTO POV:

"Am I dead..." Whispered Naruto as he woke up in what appeared to be a sewer. He was confused. The last thing that he remembered was the appearance of the dog-masked ANBU, the flash of lightning from said ANBU's hand, the sound of birds and then everything went black. He managed to stand up looked around to see if he could find out something about this place. It felt unusual for him, as if he belonged here. He suddenly felt a jolt of pain and was on his knees.

'Looks like I can still feel pain huh... I must still be alive then. Those fools must have thrown me in here and left me to rot.' thought Naruto as he tried to get up. He managed to stand up again and noticed two pipes. One glowing blue and radiating calmness, and one glowing red that was radiating ferocity. He was about to go to the blue one when he suddenly heard a voice. "Come to me young one...",it said, and Naruto followed, thinking that he may as well asked the other person where he was and how to get out. If he had noticed, he would have known that he was following the red pipe.

KARNA POV:

"Looks like the child is finally here then..." he said "Even after all these years being here, I still cannot believe how I ended up here"

(Flashback)

'Seems that my strongest technique was unable to defeat my new rival.' thought Karna, as he began dispersing into magic particles 'But at least it was a good fight. I have no regrets now.' These were his final thoughts as he dispersed completely, preparing to return to the Throne of Heroes. Suddenly, a rip appeared in the sky that absorbed all the magical energy in the area, which just so happened to include Karna's soul. It then closed, as if it were never there in the first place.

On the night of the Kyuubi attack:

Minato Namikaze, the Yondaime Hokage of Konoha, prepared to seal the Kyuubi into his newborn son Naruto. As he summoned the Shinigami, via Shiki Fuujin, and was in the process of sealing the Kyuubi, a rip in the area appeared and a bright light shone, which blinded everything in the area. Minato, thinking that it was just a side effect of using the jutsu, failed to notice something else enter the seal.

(Timeskip - around 10 minutes later)

Minato and Kushina had said their last words to their son and had just died. Had they stayed alive longer for a few seconds, then they would have seen his hair turned whitish-silver from the original blond that it was. It was then, Sarutobi Hiruzen, The Sandaime Hokage, along with a few ANBU, appeared at the scene. He looked down in sadness at the demise of a powerful shinobi and kunoichi. He then noticed the creature that was responsible for his successor's death and glared at it with malice.

"Take the bodies away. We shall have a proper burial later. Meanwhile, I shall deal with this thing" ordered Hiruzen. The ANBU saluted, picked up the bodies and left.

(Meanwhile, in Naruto's Mindscape)

Karna was very confused. How did he get in here? He should have awoken in the throne of heroes with his rival looking at him with a disappointed stare that said 'How could you lose to anyone but me?' (2). Instead, he woke up in a dark void(3). Behind him was a huge cage, which had a red glow behind it. He approached the cage, only to be on the other end of a massive roar by a giant nine-tailed fox. 'Must be a Phantasmal Beast' he thought as he analyzed it. He sensed a lot of hatred emanating from the beast but at the same time, much to his shock, sensed the fragment of a god (4) as well! 'Well this is interesting' he thought."What kind of Phantasmal Beast are you and why do you have the power of a god?" he demanded, wanting to know what situation he got caught into.

"YOU DARE COME HERE AND MAKE DEMANDS FROM ME? THE GREAT AND ALMIGHTY KYUUBI NO KITSUNE, STRONGEST OF THE NINE BIJUU? WHO DO YOU THINK YOU ARE?" Roared the Kyuubi, obviously still angry because it was sealed again.

"My name is Karna, and I am a heroic spirit" he said, while at the same time, checking how much magical energy he still has, in case he needed to fight this 'bijuu'. He felt his reserves being full. Not willing to ponder over it, he prepared for a fight, though he was still tired physically(5).

"I HAVE NEVER HEARD OF A 'HEROIC SPIRIT' BEFORE AND I DO NOT CARE! ONCE I HAVE KILLED YOU, I WILL BREAK THIS SEAL AND BE FREE ONCE AGAIN!" Roared the Kyuubi as it lunged for Karna, who stepped a good distance behind in order to avoid the Kyuubi's claws. He then looked up to see a piece of paper on the cage. Using his sensory ability(6), he noticed that the beast was sealed into something. A human child to be specific. He also noted that there was a direct link between the child and the seal. If the seal was broken, then the child would die, and he wasn't going to let it happen.

He was brought out of his thoughts when he noticed a build-up of energy coming from the fox. When he saw that it was aimed at the seal, he used his Mana Burst, summoned his spear and attacked. The fox was surprised by the blow that it received and lost the concentration that it needed from the attack. While it was recovering from the surprise attack, Karna was panting. He was too exhausted for a prolonged battle and wanted to end it quickly. He dispersed his spear and began to bring forth his most powerful Noble Phantasm. 'I never thought that I would have the need to use this so soon.' he thought, as he shed his armor, in doing so, he has given up all of his defense and focused his offensive power on this last attack.

"THAT'S IT NINGEN! YOU WILL PAY FOR -" the Kyuubi roared before being interrupted by an enormous explosion of energy. When the explosion died down, Karna was seen floating in the air, holding an odd weapon in his hand, held up high.

'W-WHAT'S WITH THAT WEAPON? AND WHY AM I FEARING IT?' (7) Thought a frightened Kyuubi, due to the attribute and sheer amount of power that was radiating from the weapon. Not wanting to be on the opposing end of the attack, the Kyuubi began charging up for its most powerful attack, the Bijuudama. In preparation for his own attack, a wing like armor extended on his left and a flame-like wing emerged from the right.

"For attempting to harm an innocent child just after he is born, YOU SHALL BE PUNISHED!" roared Karna. He then began chanting:

"Know the mercy of the King of the Gods.

With this single strike, I shall inflict extinction

Be reduced to cinders,..."

"BIJUUDAMA!" "VASAVI SHAKTI" Both the Kyuubi and Karna roared as they released their most powerful attacks. However, Karna's attack, owing to its anti-divine property, completely overpowered the Bijuudama and struck the Kyuubi. There was a huge explosion in the mindscape and a flash of light. Unable to handle the stress caused by the attack, Karna passed out.

(Timeskip - around 2 days later)

Karna woke up with a groan as tried to remember what happened. He then caught view of something in the distance and rushed there. To his surprise, it was the Kyuubi, who was simply laying down. Karna immediately summoned his spear and wondered how the Kyuubi had managed to survive his most powerful attack when he had witnessed it striking the target's divine soul. When he reached its face, he was surprised to see that the Kyuubi's eyes were nothing more than pitch black orbs. It was like looking into a void of darkness. After a closer examination, he concluded that the soul must have been destroyed, but the energy that was held together remained. Now the Kyuubi was nothing more than a shell.

He then took a sample of the Kyuubi's energy in order to look at its memories(8). He then promptly passed out due to the large amount of memories that he received.

(Timeskip - another 2 days later)

Karna was busy analyzing the memories that he had taken. Apparently he was in a new dimension itself, a place called the Elemental Nations. Over here, people used this energy called chakra, which enabled them to perform feats that people in his old world could only dream of. Wielding the five elements, summoning Phantasmal Beasts and cloning oneself was just a few of the things that this energy could do. Another thing he learnt was about nature chakra, which was very similar to mana, so he decided to try and see if he could refill his almost empty mana reserves. He sat down in the lotus position and closed his eyes. After a few minutes, he could feel his mana reserves rising, so he continued to fill them until they were filled.

After much contemplating on what he wanted to do in this new world, Karna decided to stay in the mindscape and help his host out wherever possible. After a year, he linked himself to Naruto's senses to experience what was going on in the outside world and he did not like it one bit. For the first two and a half years, Naruto was given the barest minimum that he needed to survive, something about Hokage-sama's orders, was what he heard. After that, he was constantly isolated and even beaten up by the other children and even the matron of the orphanage, who rewarded the children that beat him up. At the age of four, he was kicked out of the orphanage by the matron, who said "Get out demon! We don't want you corrupting the other children!".

A month later, he was found by a man who the people called the 'Hokage', who offered to treat him to some food. Karna noticed that although the old man had a kind smile on his face, he also had that glint in his eye whenever he looked at Naruto, as if he was plotting something. The Hokage then gave him a place to live ( which was in a very poor condition ), told that people would be nicer to him if he smiled and gave them time, and simply left. Afterwards, the beatings started. People suddenly running at him, wishing for his death so they could have their 'revenge'. After learning of the Kyuubi's healing powers, Karna decided to help Naruto by channeling it's chakra to any wound that he had received(9). Even after months and months of these attacks, Naruto still smiled, so that they wouldn't attack him anymore.

(End Flashback)

Returning to the present, Karna saw Naruto approaching him and smiled."So you have finally arrived young one..." he said in order to catch Naruto's attention. Naruto quickly turned to face the source of the voice that had called him. (AN: I don't feel like describing Karna's appearance so just look up Karna Fate/Apocrypha) "Who are you mister?" Naruto asked cautiously.

"Oh forgive me. I have yet to introduce myself. My name is Karna and I am a Heroic Spirit" said Karna and inwardly chuckled at Naruto's expression.

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(1)You may know where it comes from. Please tell me I'm not wrong. I just see it that way.

(2) I'm guessing that's how Arjuna would act. I don't know if I'm right

(3)He's just born. You can't expect him to have a fully developed mindscape.

(4)Shinju - 'GOD' Tree . Enough said

(5)He just came out of a fight in which he used his strongest weapon and still lost. He has to be tired.

(6) He can do this in the fic. Please go with it.

(7)Anti- Divine NP. It has part of the Juubi's soul as well. Just go with this please.

(8)Please go with this.

(9)Please go with this also.

AN: That's it for the first chapter! Please review so I can improve on any future chapters. I don't mind anything negative. Just a reminder that this is my first fic so I probably suck. Just tell me if I'm going wrong anywhere.

PEACE!