Hello today I bring the english version of my crossover story between Fate Stay Night: Heaven Feels and Dr Strange. All rights belong to their creator rights Type Moon and Marvel Comics. I hope you understand. Spanish is my native language. Sorry for my bad english

Earth-19999

New York. Sanctum sanctorum

Stephen Strange has already seen in a year more than one would expect in his entire life. Honestly, his life took a 180 degree turn. From being a neurosurgeon he became a guardian sorcerer of the Sanctum Sanctorum of New York.

If he had been told that this was his destiny, that he would face an interdimensional entity, a few years ago he would have laughed. But let's face it. Who would have believed it?

Many things have happened since that day. He also made a list of potentially dangerous beings that could affect this world. He had great power now and he always wondered. With this great power could I fix my hands? Yes, I could. But it did not. Because now he had a greater mission and duty than anyone could have imagined.

This reality is vulnerable and even more so with the death of The Ancient One and the dissolution of the Avengers.

He looked at the place on his neck where the Eye of Agamotto used to be, which, according to Wong, contained an infinity gem. The time gem to be more precise.

But you still need to learn a lot more before you are able to use it properly. He had used it against Dormammu before but with great difficulty and he wasn't sure if his plan would work. It was a miracle ?. Now he was convinced that it was.

He kept thinking about The Ancient one words. The multiverse. Dormammu was a great threat. And as she said there were other realities, some full of benevolence and others full of malice. And there he asked the following question:

Will there be worse things worse or almost the same as Dormammu out there?

A small bump awakened him from concentration.

"Hey stop" said Stephen laughing. "We already talked about this." He couldn't get mad with this cloak. He had saved his life on more than one occasion.

"It seems like he thinks you need to relax" Said a voice that he already knew "I understand that you have a huge load on your shoulders, but always remember that you are still human"

"Thanks Wong" said Stephen. "But he didn't stop thinking about what there are more threats like Dormammu out there. You said it yourself. The news of the The Ancient One death will spread throughout the multiverse. Which is preventing them from attacking at this time."

"The habit of despair is worse than despair itself,"

"Yes I know" Stephen said looking his shaking hands. Other than that there was something that still haunted him these days.

"I need to confess something to you". Said Stephen. "I once thought of using the eye of Agamotto to repair my hands. I looked at my past and now I think every day of those people that I didn't help because of my ego and arrogance. I was the best neurosurgeon but I concentrated on myself and only myself and did not think about the others. A doctor who did not follow the Hippocratic oath. Now that I think about it maybe I was one of the best doctors in the world but everyone knew that I was actually the worst. Everyone except me. I always remember the words of the ancestral. This is not about me. I am just a small piece in the huge mosaic of the universe. Now I see that it will take time, that it travels a long road shrouded in darkness, a road that will not always lead me where I want to go. But I'll go for it anyway".

"I'm starting to see what The Ancient One saw in you"

"That after Hong Kong you didn't see it?" He asked strangely

"I'm meticulous. But after everything we've been through together and see how you've changed from that man who walked through the doors of the temple. I can say that you will be the best of all, my friend".

"Thanks…my friend" said Stephen smiling

"Well I'll go to the deli for a Sandwich, do you want one?"

"Do you have money?" What happened to being attached to the material is detachment from the spiritual?" But Wong was already gone.

Stephen simply denied. Maybe Wong was right. He was worrying too much. He thought of reading one of the books in the library to relax. However, curiosity was too strong and he decided to reread Cagliostro's book again to find out more about the gem. It was his custom to always review a teaching. His whole life as a doctor taught him that. However, when he went to look for the book among others there was one that he had never seen. It was purple in color with almost hypnotic patterns with a circle in the middle. The title had the name:

THIRD MAGIC: HEAVEN FEELS

"Hey Wong. Have you ever seen this book ...?" He asked, but remembered that Wong was no longer in the Sanctum.

Strange took the book and analyzed it in detail. He felt enormous power. Almost as much as when he took Cagliostro's book.

Stephen opened it and looked for the warning before reading the book. However, when he found it it was just a strange set of letters.

"They look like hieroglyphics...wait"Stephen thought "if I look closely, some of the words seem normal rather than being spelled strangely like the others. Not to mention, the uppercase letters seem like they can be rearranged to create accurate text.

It wasn't the first time he'd solved puzzles like this. Even when he was young he had a gift for it.

When he solved it, the only thing he finally found was some strange words:

Silver and iron to the origin.

Gem and the archduke of contracts to the cornerstone.

The ancestor is my great master Schweinorg.

The alighted wind becomes a wall. The gates in the four directions close, coming from the crown, the three-forked road that leads to the kingdom circulate.

Shut (fill).

Shut (fill).

Shut (fill).

Shut (fill).

Shut (fill).

Repeat every five times.

Simply, shatter once filled.

――――I announce.

Your self is under me, my fate is in your sword.

In accordance with the approach of the Holy Grail, if you abide by this feeling, this reason, then answer.

Here is my oath. I am the one who becomes all the good of the world of the dead, I am the one who lays out all the evil of the world of the dead.

You, seven heavens clad in three words of power,

arrive from the ring of deterrence,

O keeper of the balance

Stephen did not understand the reason for those words but for some strange reason he felt a great power when he mentioned the last sentence.

When he got ready to read the rest of the book, it literally shook in his hand. He shuddered and purple light suddenly shone brightly on the pages themselves. Pages flipped by at lightning speed, but no one had a chance to read them because of the brightness. However, that is not what surprised him the most as he had to back off when a huge wave of powerful magical energy surged out of the book.

Stephen could do nothing when runes appeared under his feet and said purple light restrained and enveloped him.

Finally, when the light dissipated there was no sign of the sorcerer and the runes disappeared as if they had never been there. The only thing left that was evidence of what just happened was the old book thrown on the floor and now closed as if it had never been opened to begin with.

Nasuverse

Fuyuki

Almost touching midnight, the moon illuminated the Ryuudou Temple. It is a mountain temple on the outskirts of Miyama and as the name suggests, it is owned by the Ryuudou family. It acts as the cornerstone of Fuyuki's ley lines. It can be said that it is the heart of Fuyuki's spirit grounds. The place was very beautiful. Too bad he was about to go broke with a ghoulish scenario.

Assassin was on guard outside the temple, fighting any intruders that might approach. However he was a prisoner, as his summoning method caused him to be tied to the door itself, unable to go anywhere too far from it because of her. He hated every second, and he wished that his Master, the Caster servant of this war, would release him so he could go out and fight. His legend is not that it helped him much. He was just a disposable swordsman intended solely to play the role of Sasaki Kojirou, a fictional swordsman created from a fictional story.

Poor miserable existence, and it is about to be even more miserable.

Out of nowhere he felt a presence at the foot of the temple. This presence was not like anything he had ever felt. She did not feel like one of the monks in the temple or her teacher. It was different like ...

Suddenly I felt a sharp pain in my chest that caught him off guard accompanied by massive bleeding coming out of his mouth. It was so overwhelming that he dropped his sword which fell down the temple steps. It felt like something was twisting in his rib cage. It felt like something was crawling and eating at him from within.

"I wasn't expecting..." said Sasaki almost resigned " something like this "

A long black arm comes out of Sasaki's chest and continues until a full humanoid body appears.

He only wished he had fought a worthy opponent to make an impression on this world.

At the foot of the Ryuudou Temple

Stephen opened his eyes. He felt totally tired. This had been worse than the astral travel that I experience as ancestral.

He only saw that he was in a forest, or so he would have thought if he ignored the stairs leading to the top. From a mountain. Was the architecture Chinese? ... not Japanese. It almost reminded him of Shintoism. He knew it from some lectures he had given in Japan.

After compiling himself Stephen positioned his hands and tried to use his sling ring to open a portal.

Nothing

"What?"

He try again

Nothing

"I don't understand this. This hasn't happened to me in a long time." Said Stephen confused

After about 20 attempts. He finally gave up and tried calling Wong. Just to be told that the number he was calling didn't exist.

"What happened to this thing?" Said the sorcerer frustrated "This has international coverage."

However, everything went into the background when he felt something in the air. A similar feeling when he read the last word of that strange chant. Other than that he felt various energy signatures in the form of a line. They were all apparently heading for one place, the top of this mountain.

Convinced that perhaps there was someone there who could help him or perhaps some other wizard decided to climb this mountain. Little did he know that that choice would change the course of this story forever.

Returned to the Temple

A beautiful woman appeared outside the temple. This woman had superhuman beauty. She had blue hair. Purple lipstick. And she was wearing a black top with a denim jacket and a long tan skirt.

However, this was only her informal appearance since she was actually the Servant Caster from this Holy Grail war. He had used the ley line of the Ryuudou Temple to obtain the mana of the people who lived in Fuyuki. His actions had caused several people to fall into a coma. All this because his master Soichiro Kuzuki was not a magician and he needs this mana that he collected to stay with him. She did not like the idea of extracting the mana from civilians but to stay with the man she now loved and be together forever she would do anything. This was a woman who had done numerous calamities when she was alive. From killing her brother by the spell of the goddess of love Aphrodite, betraying her kingdom, her family, the murder of her ex-husband's children, the man she hated until these days, among other things. This woman was Medea from Colchis. Former princess and now known as the witch of betrayal.

Said woman was now looking for the Servant Assassin, who had been summoned by herself, breaking the rules of the Holy Grail system.

She felt that something was interfering with the connection with his Servant so he decided to investigate.

"Assassin show up!" she yelled "Assassin".

But there was no response from said Servant. Out of nowhere he felt a strange signature coming from the stairs of the mountain and it seemed that he was approaching little by little. When she suddenly saw Assassin's sword and it slowly began to fade indicating the Servant's death.

This alarmed her and she also felt the metallic smell of blood coming from the temple. Said temple was now silent. None of the monks were in sight. Forgetting the presence of the signature, he knew that someone had entered his territory and attacked the temple. So he rushed inside to protect his master. Now the Servant wore a hooded bluish purple robe which gave her an appearance that honored her legend.

She came to the room where she found her teacher, when she is he brought her here. She pushed open the sliding door and entered confirming his greatest fear.

"Soichirou ... sama" Medea said almost breaking

His master, the man he loved, had been brutally wounded, his legs and arms had been cut but not amputated, his eyes were cut off leaving him blind, and his belly had been opened causing great loss of blood.

The person in charge was a dark man, thin and tall, too tall. Wearing dark rags that hid his body. The detail that stood out the most was that he was wearing a skull mask.

"This man, what is he?" Asked the hooded man turning his head. "First, I sliced his head…arms, legs…I have cut it as well. I have opened his stomach. But still, he keeps on moving…" he said looking at the shattered man.

"A-Are you the True Assassin?"

The now known as True Assassin raises Soichirou's head showing that he is alive, threatening to terminate him if he tried anything. As if he knew the witch's weakness for his master.

"Release me witch" said the hooded man

Seeing that there was no other way out, seeing that it was the only way to save his master's life. She could still heal whatever mana she had with him. Caster discarded his command seals and drew his Noble Phantasm "Rule Breaker", an irregular dagger, which, while not a weapon to deal physical damage, did serve to sever a master's bond with the Servant.

With all this he stabbed himself with this weapon ending his contract with Assassin.

"Are you happy now?" she asked hopefully that with this action he would release his master.

All hope died when True Assassin stabbed one of her knives into his neck. She could only give a cry of pain before True Assassin stabbed her 3 times in the back until she stopped moving.

Once he reaches the end that the man he had destroyed was still struggling to move so he throws the knife at him giving him the fatal blow. Satisfied with his murder he was about to leave when he heard footsteps and a voice coming from outside the room.

Outside of the temple 1 minute ago

It took a long time but finally Stephen made it to the top. It turns out that it was a temple, and because of its architecture it belonged to the Shinto religion. However, the atmosphere was very heavy and everything was too quiet. It was truly unsettling. The sensation was almost as similar to what he felt when he entered a dark dimension to make the deal with Dormammu.

As he searched the entire temple he found an open room.

"Good night I am looking for the guardian of this ..." said the sorcerer when he looked at the horrible scene in front of him.

A brutally murderous man with his legs and arms severed, his belly split open and a knife to his head. He was definitely dead. In front of him and closer to the door was a hooded figure on the ground bleeding. But most disturbing was the figure wrapped in dark rags with a skull as a mask staring at him. He felt a very similar signature in this presence and in the one lying on the ground, although the latter clung more to life.

This was definitely a crime scene. And he was right in the middle of it. And the murderer did not want to leave any witnesses. Instantly the hooded figure threw the knife at Strange and he activated his mandalas and with sheer luck he managed to block the attack.

Unfortunately the assassin did not stop there. In a moment, with an imperceptible movement, he cut the distance between him and the Doctor and instantly threw a series of cuts. The killer was too fast. His movements were imperceptible. None of Kaecilius's acolytes had the same speed as this creature. He dodged all their attacks with difficulty. All they were achieving at the moment was that much of the room was destroyed. His own reflexes and mandalas prevented the cuts that were thrown at him and that some of the knives that were thrown at him like projectiles ended up on his head. His speed and reflexes told Stephen something. This thing was far from human. Unfortunately his resistane was not eternal, a knife managed to cut part of his forearm making him scream in pain.

"What are you?" Stephen demanded very exhausted and with the pain from his arm "I have faced many acolytes, but you are far from being a normal one. Did you use some kind of dark magic to increase your power? Or are you some follower of Kaecilius? "

But the Assassin did not answer any of her questions.

"If you are a follower of Kaecilius" Stephen said "You are doing all of this for nothing. He lost. Trapped forever in that damn place with his master, and he will never return"

These words to the masked man were just the talk of a madman.

"You shouldn't have been here" he said in a deep voice only to return to his attack.

He then attempted to restrain the assassin with one of his energy whips using the arm that was not injured.

True Assassin looked at this attack curiously. It was not at all like the magic of the magi of this age. I could even tell that it resembled true magic. This feeling was also not ignored by his master.

Stephen kept throwing whip after whip, the assassin was too fast, easily dodging any attack. Finally, True Assassin takes one of the whips, but uses it to cut the distance between Strange by knocking him to the ground and kicking him towards the room door, finally getting behind the sorcerer's back. True Assassin received a mandate from his master, to kill this man immediately, therefore, he raised the knife to deliver the death blow just as he did with that human master of Caster. When suddenly her cloak wrapped around the assassin's head and she began to shake him as True Assassin tried to rip her free.

Stephen did not know how lucky he was. This cape was the second time he had saved his life. He instantly seized this moment and prepared to conjure an attack that he had practiced a long time ago. He could never perfect it and now was the time. It was very powerful in destructive capabilities and also in dispelling the underlying darkness.

Seven Suns of Cinnibus. Stephen, joined his hands in two circles and two rays came out of them, which zigzagged at seven points across the room at great speed before finally becoming a single attack. He had used it once as a practice and ended up nearly killing him. Now was not the time to doubt or ponder it, it was a life and death situation. And honestly he would rather die at least attempting this attack than give the satisfaction to this assassin of being killed by his hands.

The high-powered attack was in the direction of the assassin who was still trying to free himself from the cloak. However, it went out of the way with a few rips from his knife before it was struck head-on. However, the assassin did not have the same luck and received the full attack sending him flying through the walls of the temple and destroying much of the room.

Stephen didn´t know, but the attack also scared away a kind of creature that was a rotten mix of black and red that was crawling on the ground. But this was not perceived by the magician.

Stephen knew that he had survived because for a human being that attack would have been deadly but he could still feel his signature. Whatever that thing was definitely not human. He could also say the same for the figure lying on the ground, whose life was slowly dying out. Putting the cape back on, he went to the survivor and examined her.

Lower the hood to get a better view of the injury. I could tell that she was very beautiful. The most beautiful woman he had ever seen if he was honest. For a moment he was stunned by her beauty before reality hit him. Now was not the time for that. He had an emergency on his hands. A Cut in the neck and the cause of the bleeding in the back is for 3 stabs.

"Hey, do you hear me?"

He received no sound. He could only see how his breathing became more and more agitated. He had to do something now. Possibly he was no longer a doctor, but his Hippocratic oath now was untouchable. Always help the injured. Perhaps he did not put it into practice correctly in his years as a neurosurgeon due to his ego and arrogance, but that Stephen Strange died in that car accident a year ago, now he was another. He wouldn't make the same mistake.

Stephen touched the part of his neck only to see that Eye of Agamotto was not with him. With that gadget he could practically fix all of this. Well there is no time for regrets. He had to act now.

It was too far from the hospital judging from the location of the temple. At that moment, without him knowing it, a drop of his blood from the murderer's previous cut fell towards the mouth of the woman he had on the ground and she reacted to that by giving light murmurs. This caught Stephen's attention. But this lasted a short time because he felt the presence of that murderer approach from where he had been thrown.

Stephen tried to use his wave ring again until for a moment he remembered that he could not use it. Before patting his face for forgetting something so recent, which should not be normal with his photographic memory, a miracle happened.

"Seriously, right now?" Stephen wondered watching the portal open.

However, where this portal led was at the foot of this temple. Place where he had woken up after reading that damn book. Sensing the presence of the assassin near, Stephen carried the woman in his arms, pressing on the bleeding in her neck with his hand and with his arm behind her back. Too bad it didn't have bandages it would be more suitable, but it's the only thing he has now.

True Assassin arrived, with his rags damaged from the previous attack, which revealed his deformed and thin physique, to kill the sorcerer only to see the portal close with the doctor carrying the body of his victim. His master was definitely not going to be happy about this.

At the Matou Residence

Zouken Matou, you could call him that is everything bad that existed. His plan began when his useless grandson lost in a fight with Saber's master. So he had to enter the Holy Grail war to achieve his goal, immortality. His plan was to summon True Assassin through the Assassin who had been summoned by Caster. Once summoned his Servant, he intended to use his familiars to revive Caster's corpse when she died so that he could easily destroy the other masters. But now that plan fell apart. All because of that mysterious anomaly that had appeared in the temple which took Caster's body before she died.

This man. Those techniques that he use. He had used spells that he had never seen. And he was not talking about a new kind of thaumaturgy, this artificial creation of men. He talk about true magic, that same one from the era of the gods, the highest class of mysticism. The same that was obtained from the Root. The true purpose of this war. That purpose that he had unknowingly forgotten a long time ago. He had ordered True Assassin to kill him so he could study him. This man could be the key to his current goal. However, he turned out to be more powerful than he expected. That attack not only caused a great destruction, but also scared away several of his familiars who tried to take the Caster's body. Well, he'll have to improvise with recent events.

In a citadel outside of space and time

A purple-cloaked figure on a chair sensed a disturbance in the sacred timeline. He simply smiled at this change. Now the timeline was more vulnerable. Everything was going as planned. From here Strange would not play any role in his plan. But without knowing it, he had taken the first big step. The first step to the fragmentation of the sacred timeline.

The first step to fragmentation. Meanwhile he looking closely a certain branch and from this branch, others sub-branches came out which were advancing at a slower rate than any other that had been generated. This was the cause of the delicaded state of the line.

It had long since kept this branch out of sight of the TVA. And he planned to keep it that way until the time comes.

Well as I said at the beginning. This story will be a crossover between Fate Stay Night: Heaven Feels and Dr strange (MCU). The story occurred to me after reading some Fate fanfics and saw that it has almost few crossovers with Marvel. But most always put Spiderman as the one who has the most interaction with this universe. And it always surprised me that when they do these crossovers they always leave out the one that should make the most sense to appear, which would be Dr Strange, being one of the most powerful magical characters in Marvel.

Well as you see this story will be a Dr Strange x Medea (Caster). Because, well I've seen that Caster has so few good stories either here or in fanfiction. And she is a character that I really always see her in Fate, I empathize with her. No matter how bad she has done, I always end up empathizing with her. It is for me one of those villains that I cannot hate. Something very similar to what happens with Loki from the MCU. And because I chose this route, because I feel that this route was too cruel to her. But don't worry, I know that she is not entirely innocent.

The Dr Strange we see in this story is from the MCU. Because I chose this Dr, well because the one in the comics is practically OP for this universe. If I put the 616 version, the holy grial war would not last two days. Which is why I feel like the MCU version is a bit more Fate-level. I do not speak for the Servants, because well here we saw that Hassan almost killed him, but at the level of masters, except for Shirou of course. At least for now.

About The sling ring that doesn't work and then it does. Well in my opinion I think the Doctor has to have been somewhere to be able to go there. Kind of like the World of Warcraft flight paths, that you need to have discovered the area to be able to go there. The only thing that ties me to this theory is when in Endgame it opens like 15 portals to bring various troops including several from other planets. But I still think Strange couldn't perform that act alone.

About what haunts strange to this day. It is something that until now has not been seen in the MCU.

By the way, He Who Remains will only appear here. I only put it on because having a journey between realities he should have felt it.

The scene of the blood healing Caster, as the servants need mana. So the blood of Dr Strange being a sorcerer with a magic that resembles that of the age of the gods (for the Marvel universe), it must have large amounts of mana. I got the idea from a Harry Potter fanfic, where he also healed Caster using his blood.

Sorry if the battle is too short or hasty. I'm not very good at writing fights. Another fact is that I am not a Fate loremaster. I know all the basic like the three main routes, Fate Zero and Apocrypha.

This is an idea that I had in my head a long time ago. Leave your comments. I hope you like it.