Senji Muramasa (千子村正?), Class Name Saber (セイバー, Seibā?), is a Saber-class Pseudo-Servant summoned by Ritsuka Fujimaru in the Grand Orders of Fate/Grand Order. He is also summoned as Alter Ego (アルターエゴ, Arutā Ego?), working as one of the apostles of the Alien God in the Lostbelts. They are working in tangent with the seven Crypters attempting to supplant the Greater History of Man with the Lostbelts.
- 1 Profile
- 2 Role
- 3 Abilities
- 4 Development
- 5 References
A swordsmith from Ise Province, Kuwana. Muramasa is a famed blacksmith within Ise Province. His title by the time of the Bunki era is Uemon-no-jō. He is said to be the founder of the swordsmith school which made the sharpest katana in the Sengoku era. (There are also documents from the Edo period that make a Muramasa from the Jōji era the founder and talk of three generations continuing until the Ōei era, but the oldest sword making by the Muramasa school that has been confirmed is from the first year of the Bunki era. For this reason, the Muramasa from the years of Bunki has been made the founder in the original work)
Legend says that he has forged a demon sword that antagonizes the Tokugawa clan. There were stories about his Katana that killed Tokugawa Ieyasu's grandfather, there's also one that Nobuyasu used to commit suicide, and there’s also one that actually cut Ieyasu himself.
Muramasa theorized that he was summoned in Shirou's body because Shirou has a similar body and mind to that of Muramasa's. Furthermore, he believes Shirou had shared his way of life and experienced a similar end. Muramasa speculates that Shirou could be his descendant, a theory that Parvati also believes to be true.
He appears at "Tournament of the Seven Blade-Master Heroic Spirits" as a Heroic Spirit dispatched by the Counter Force, and in the bleached Earth as a Heroic Spirit summoned by the "Alien God".
His interior, his truth, by any chance―――
"Huh? There's nothing mysterious or strange! As long as I can do a job I'm satisfied with that's fine!"
Like his fellow Disciple Ashiya Douman, the Alien God's Alter Ego-class Muramasa has various Divine Spirits combined into him. They are god-slaying Divine Spirits, giving Muramasa himself powerful anti-divine powers. One is a blind god of war who brought about the Twilight of the Gods, and the other is his dearest wish, his aspiration. The playable guest Muramasa in the English Lostbelt has unique voice lines in combat mentioning Kushinadahime, implying that the second one is Susanoo, the wielder of Kusanagi, the sword that Muramasa recreates with his Noble Phantasm.
As he is summoned in Shirou's body, he bears the same appearance as Limited/Zero Over Shirou. His stage 2 clothes are described as his normal outfit while in his forge. Upon reaching stage 3, his skin slightly darkens and his hair becomes white, causing him to slightly resemble Archer.
An old man who devoted his life to making swords. His appearance is that of a fearless young man, but his spirituality is rather close to his later years. Dashing, no hesitation, and no rot. There are a lot of blunt words, and it be can't said that they are flattering. At first glance, he tends to look like a cold person, but when you associate with him, he's very caring. He is a person with a generous temperament.
This is personality of Muramasa himself, but it is also the personality of the body used as a substitute. ........Or, if this young boy's life reached old age, he would attain a similar personality.
No matter the person or the content, if asked to do a job, he is work (loveable) person, who has the pride to "finish" it. For work, he sometimes uses ruthless and cold means, but he doesn't seem to only work as a bad person.
The ultimate sword he is aiming for is something that can purge the hate. A katana that cleaves through fate, destiny and karma. That can purge one's cause itself.
- Miyamoto Musashi
- "Miyamoto Musashi? I know her. Not the male one, but the female one. She's noisy but she was a swordswoman who had guts and bloomed like a flower. It's one of the few records Muramasa brought back to the throne with him. That vagabond , I hope she reaches the point she set her eyes upon at the end."
- "There's an Archer who wears a red frilly outfit right? I'm not good with him. My back feels ... itchy when I see him. Damn it, what is this feeling."
- EMIYA Alter
- "EMIYA Alter ... at this rate I don't even understand anything anymore. My back doesn't tingle but I feel uneasy looking at him. Also, he treats his weapons very roughly. What ya call it again, commercialism over quality?"
- Artoria Pendragon
- "The king of Britain is here right? Talk to her properly okay. That type of king will try to bear everything by herself ... what? Is it weird that I'm worried about her? I can't help it if I' m genuinely worried okay."
- Artoria Series
- "Ya know, I did forge a lot of the same blades ... but ain't there too many versions of you, your majesty? Are you planning to dominate every category?"
- Artoria Avalon
- "That energetic young lady...holding the...staff of selection, was it? Oh yeah, that's right, the girl with the staff. I'm not sure why she bows her head when she sees me, but I wonder if I know her from somewhere. And yet when I talked to her, she said "There you go again, Muramasa!" and starts complaining. Oh but it's not that bad. Plus she eats my meals quite alot."
- Yagyuu Munenori
- "Geh, you're the sword instructor of the Tokugawa huh. It's true that Muramasa is Anti-Tokugawa, but it's not like I have a grudge with them or something. It's a property added on due to records in fiction. Well if said Tokugawa was one of my fans then surely he'd die holding a Muramasa though."
- "Whoa !? What the hell's with that girl !? She's huge! Hold on, what's with that divine aura !? It can't be, could it be, that girl is the avatar of Ibuki !? So that sword ... that's the sword of Kusanagi ...!? Holy shit, offerings offerings!"
Muramasa was freed from Muryan thanks to the currency provided by Oberon. Muramasa states that he likes his bluntness when he told off Koyansaka. Even if it was a lie he applauded his acting skills. Oberon expressed joy when Muramasa stated that he would accept his condition for a forged katana and sadness when he believes that it would not be fufilled, though it is unclear how Vortigern feels towards him.
Subspecies Singularity III: Shimosa
A month prior to Ritsuka and Miyamoto Musashi's arrival, the Counter Force summoned Muramasa to the Shimosa Singularity for the purposes of stopping Amakusa Shirou Tokisada. Not knowing why he was summoned, Muramasa eventually came to Onui and Tasuke's village as he was summoned near there. There he found half of its population were slaughtered by the Heroic Spirit Swordmasters' monsters, including the children's parents. After taking the children in, he took the hermitage from the western village. Given that it previously belonged to a blacksmith, Muramasa was able to set up a workshop.
He meets Ritsuka and Musashi when Onui and Tasuke bring them to the hermitage. He has the children to go inside so he can speak with the pair alone. Thanking them for keeping the children safe, he tells Ritsuka and Musashi that he’ll allow them inside on the condition they tell him about themselves. They’re unable to answer because Houzouin Inshun has caught up to them. Muramasa dodges his attack and destroys his upper body with a single blow. Inshun regenerates and boasts there isn’t any technique nor blade that can reach the Spiritual Core of a Swordmaster. Regenerating from another attack, he reveals massacred the northern and western villages before coming to the hermitage. He claims his body is now a puppet controlled by karma, so only his complete destruction can stop him. Musashi grabs the sword Muramasa recently made to use against Inshun, feeling a divine aura from it. Muramasa considers it a failure, saying it can effortlessly cut through anything, but he pushed it into the realm of demons. After Inshun is slain, everyone heads inside.
Muramasa allows Musashi to keep the sword she used to slay Inshun as thanks for bringing the children back. He calls it is a failure, since it is an evil blade that reached the realm of demons. He then explains the ultimate blade that he seeks. Musashi realizes she freed Inshun from his karma thanks to the sword. Muramasa still considers it failure though since it cannot cut bonds or certainty. He then dubs it Myoujingri Muramasa, revealing his True Name.
Later in his workshop, Muramasa explains the circumstances of his summoning, and how Onui and Tasuke came into his custody. He then recalls several rumors. Monsters started to appear around the time he was summoned. The Swordmasters control the monsters. A man at Katori Shrine summoned the Swordmasters to destroy humanity. The Swordmasters razed the Hitachi Provice. Musashi decides they need more information on the monsters and the Swordmasters. Muramasa directs them to Toke Castle town as a place to get more info.
He has Ritsuka and Musashi take the children with them when they leave for town. However, two days later, he comes to retrieve the children. He reprimands Ritsuka’s party for leaving the children alone with Otama while they went after Tomoe Gozen. He also agrees with Otama that the group caused her trouble by staying at her inn longer than they said. Afterwards, he returns to the hermitage with Onui and Tasuke.
He later hears from a travelling merchant that two beautiful women massacred an army near Arakawa River. The women also destroyed the Sagami Province. Afterwards, they went on a killing spree until high noon. Because they vanished by then, smaller villagers were spared, but larger settlements were nearly massacred.
He meets Katou Danzou when Ritsuka’s party returns to the hermitage. Deducing that she works for Yagyuu Munenori, he doubts she is a Swordmaster since she bypassed his Bounded Field. He invites her to stay, and she accepts. After supper, he tells the others about what he heard; they deduce the women are Swordmasters. Muramasa then examines Myoujingri Muramasa to determine three Swordmasters were slain. He deduces one was Tomoe, and the other was Mochizuki Chiyome, who tried to assassinate Kiyohime. Suddenly everyone hears Onui screaming from outside.
They rush out to find her and Tasuke captured by Shuten-douji and Minamoto-no-Raikou. The Swordmasters overwhelm the group using only a fraction of their power. Raikou tells them to come to the peak of the nearby mountain before high noon if they wish to save the children. After they escape, the group prepares to go to the nearest mountain.
After Muramasa forges a new sword, the group leave for the mountain. They cut through the nearby bamboo forest into a mountain trial. As they continue to ascend, Muramasa confesses he forged many things to save up money for Onui and Tasuke’s futures. When he disappears, he wants the children to have happy futures of their own choosing, and grown up in a peaceful world without knowing hungry. Therefore, he won’t let anything get in his way, not even a giant snake. Orochi then suddenly appears, even though Chiyome is long gone. Fuuma Kotarou realizes Shuten can summon it because she is a descendant of Orcohi. With the last of its energy, Orochi knocks Ritsuka down a slope. Kotarou goes to save them when another Orochi appears.
Musashi, Kotarou, Muramasa, and Danzou eventually find Ritsuka. Kotarou uses his clan's secret ointment to close their wound made by Shuten. After getting more rest, Ritsuka continues onward to the peak with the others.
There the group demand Shuten and Raikou to give the children back. They doubt Shuten’s claims that she ate them and kill the Orochi she summoned. After Shuten disappears, Raikou tells the group the children are safe and unharmed in a nearby shrine. She asks Muramasa to apologize to Onui for her, for tying her up, and getting a little rough when she cut her ropes. Muramasa replies whether he passes on her apology depends on what Onui thinks of her. Raikou then asks the group to defeat the Swordmasters and prevent the Onriedo’s arrival. After she disappears, Kotarou arrives with Onui and Tasuke. Muramasa gives Onui Raikou’s apology for tying her up. Onui responds the ropes were loose, and she tearfully recalls how Raikou was exactly like her mother. Everyone then returns to the hermitage.
At the hermitage the group sees day become the blood moon night. They assume another Swordmaster has arrived. Danzou sends up a flying observational device to see that Toke Castle has been transformed. With Muramasa and the children, the group ride to town on the horses he provided.
Arriving in town, Kotarou scouts on ahead, and assumes the castle is the cause of the monsters in town. He also says several townsfolk were turned into monsters. Danzou confirms the eastern area has been completely wiped out. Since the east is closer to the castle, the group assumes people become monsters when they get close to it. They then notice Otama helping people evacuate. She confirms most of the survivors have already escaped an hour from when the carnage began. Munenori and his samurai fought the monsters long enough for the survivors to escape. Leaving the children with Otama, the group leave for the castle when two Orochi arrive. They slay one, then encounter the missionary who fought the other Orochi. He explains Amakusa Shirou Tokisada plans to sacrifice Kiyohime to Onriedo Castle to destroy every world where the Tokugawa exists. The group then rush towards the castle to save Kiyohime and stop Amakusa Shirou.
Danzou guides the group to the castle courtyard. There she tries to confess she is an enemy spy, but Musashi reveals it before she can. The group suspected her at different times; Musashi and Muramasa from the beginning; Kotarou after Chiyome’s demise; Ritsuka after Onui and Tasuke were abducted. Danzou reveals Saber commanded her to aid the group against the Swordmasters, while Ashiya Douman ordered her to kill them if the chance presented itself. Danzou believes she gained a soul, and guided the others to the castle of her own volition to stop its activation. Douman appears and mocks her for thinking such. He then explains how he found and altered her to serve him. Musashi attacks him, but a barrier stops her. Danzou also tries to attack her from behind, but Kotarou stops her. Danzou realizes Douman has been controlling her actions the whole time. Douman then calls the monsters that he’s been keeping at bay, which is why the group never encountered any in the castle so far. He also has Danzou fight the group, revealing he imbued her with a sorcery that recreates the Curse of Annihilation’s karma through machinery. The group slay the monsters, but Danzou is too fast for them. Danzou then self-destructs herself.
The explosion takes out Musashi’s eye while leaving Danzou in critical condition. Ritsuka stops the bleeding with their Mystic Code, but Douman’s curse prevents the eye from healing. Douman summons more monsters after stopping a slash from Musashi that would’ve beheaded him. Then, imparted with the first Kotarou’s magical energy from Danzou, Kotarou helps slay the innumerable monsters summoned by Douman. Douman casts the Curse of Annihilation on Musashi to transform her into a Swordmaster. Ritsuka however, uses the Mystic Code Rain of Isis to remove the curse. Musashi uses this opportunity to slash through Douman’s multi-layered barrier. Kotarou wounds Douman after Musashi slew the spirit he summoned for their duel. While Myoujingri Muramasa should be the only blade capable of harming him, Kotarou was able to thanks to Danzou passing her will onto him. Kotarou then seemingly finishes off Douman.
Mash, Leonardo da Vinci, and Sherlock Holmes contact Ritsuka, and explain what happened to them. Sherlock reveals Shimosa isn’t a Singularity, instead it’s an alternate world that poses no threat to humanity. Musashi is a Mobile Singularity, but she isn’t the only factor responsible for what happened to Ritsuka. When multiple Mobile Singularities are in the same world, a number of abnormalities and unusual phenomena will occur. Ritsuka and Muramasa deduce Amakusa Shirou is the other Mobile Singularity. After communications end, the group enters the castle keep.
The group reaches the keep’s 4th floor when Douman tries to ambush Musashi. However, before either can do anything, Saber of Empireo kills Douman. Saber then reveals himself to be Munenori, the only human among the Swordmasters. He reveals he joined Amakusa Shirou for a chance to duel Musashi again. While Ritsuka and Mushai stay to fight, Muramasa and Kotarou head for the 5th floor.
Confronting Amakusa Shirou, Muramasa realizes why he was summoned. He calls him a vengeful ghost in human form whose mere existence threatens this Shimosa. For Onui and Tasuke’s sakes, he fights Amakusa Shirou with Kotarou, but their attacks are useless. Ritsuka and Musashi then arrive to help fight him until he traps them in Shimabara Hell. However Muramasa forges Tsumukari Muramasa upon hearing Onrideo Castle is ready to activate, and bisects both the Reality Marble and Onriedo Castle.
As the castle burns, Muramasa explains his sword could reach outside the Reality Marble because Onriedo Castle shares part of its name with Edo Castle. The name Muramasa is synomous with the Tokugawa’s downfall, so Amakusa Shirou would have succeeded if he didn’t rhyme the name of his castle with the Tokugawa’s own. Kotarou then pierces Amakusa Shirou’s heart with the kunai that Chiyome left behind, and finishes him off. Deducing Ritsuka and Musashi are on the other side of the keep, Muramusa has Kotarou escape with Kiyohime. He then disappears since he used a divine sword without the body of a god.
Lostbelt No. 5: Atlantis
He was sent as part of the Olympus Defense Force to deal with the Servants of Panhuman History. They take refuge in the Temple of Astraea, and in gratitude to the goddess' hospitality, he sculpts several statues in her honor.
Astraea, recognizing him as a servant of Panhuman History, asks him why he is against them now, to which he replies that being a servant may be convenient, but he cannot choose his master. He was summoned as an Alter Ego by the Alien God. Although he has no idea what his master is like and what its true intentions are, he will focus on the tasks entrusted to him, even if his actions are considered unjust to others.
Their talk is interrupted by Rasputin, who reports the sudden appearance of the remaining enemies. The Alter Egos can return to Olympus if they take care of the last one of them. Muramasa asks if they are going to deal with the remaining servants in the usual way, to which the Priest responds that both of them are enough for the task, so Limbo's assistance won't be necessary. Concerned about the Priest's mood, Senji asks if he is enjoying the situation. After a brief talk about their pasts, Senji ends up admitting that he is not the type of person who trusts his back to someone else, but as long his partner is protecting his back, he can swing his blades in battle without worries.
At some point before leaving Atlantis, Muramasa visited the Temple of Hephaestus by Zeus' order to prevent Chaldea can make use of the remains of the smith god, but he just cut off a part of the temple that contained a portion of the Hephaestus' data store, taking it with him to Olympus.
Somewhere in Olympus, he is forging some artifact while Hephaestus observes his skills for the smithy, which he exalts them like those of a blacksmith who surpasses the duality of good and evil, creating exactly what he was asked for. Muramasa agrees that he has to forge what his client seeks, even if it is some kind of weapon to destroy the world. When Hephaestus asks him if he is not satisfied, Muramasa replies that he is only doing what he was tasked for, so he is unsure about that.
Lostbelt No. 5: Olympus
He appears suddenly in the workshop, joking about Caenis' bad mood, who is making a fuss all over the place. Caenis points her spear at him, asking him who he is and if his class is Assassin, since she was not able to detect his presence, which he answers that if they are in the atelier of the god of the forge, then he would be a simple blacksmith. Mash identifies as the servant who helped Ritsuka back in Shimousa, but now he is one of the Apostles of the Alien God. He talks about how much has happened since then to end up being summoned as an enemy of the Human Order, which he doesn't find funny. However, he expresses his happiness in meeting a true blacksmith god, even if he is older than he expected. Hephaestus lets him know that it's rude for a grandfather to call another grandfather, to which Muramasa sarcastically apologizes.
Having suspicions about Muramasa helping Hephaestus to complete the Summoning Vessel, Musashi asks him if he plans to destroy it as soon as its completed. Senji tells them that Rasputin entrusted him with two tasks: to protect Prometheus-Hephaestus and preventing Chaldea from encountering Hephaestus' iteration in Atlantis. Destroying it would be the easiest option, but due to deicide being a taboo in Atlantis and an Odysseus unable to bring himself to do it, it was time for the Alteregos to act. But Prometheus-Hephaestus threatened him with self-detonating if he did not help him with his project, so he didn't destroy Hephaestus, although he did report to Zeus that he did, and became the disciple of the blacksmith god. Muramasa mentions that Zeus entrusted him with a third task: the elimination of Chaldea. He has no plans to betray the Alien God or Zeus, but because he is accomplishing his tasks in sequential order, the completion of the Summoning Vessel is a priority. Macarios asks him if he can really ignore Zeus' order until then, to which he replies that time is upon them, and that as a blacksmith he doesn't think he can have a chance against Chaldea's servants. He reveals about the roles of his fellow alteregos: Rasputin, who is in charge of supervising the crypters; Douman, who is in charge of supervising the Lostbelt Kings; and him, whose role does not begin until after the descent of the Alien God, is to be a kind of "steward" who can be trusted, so he cannot allow himself to die yet. After revealing that, the Alien Priestess suddenly appears. Muramasa calms Musashi by telling her the Priestess' role is to be an arbiter, so there is nothing she can do but observe. Having finished helping Prometheus-Hephaestus, he advises both Adele and Macarios to not recklessly sacrifice their lives before leaving the atelier.
At some temple in Atlantis, Muramasa is seen conversing with Rasputin. Senji asks if the Alien God suffered damage due to Wodime's Sirius Light, which the priest denies. Rasputin admits that, thanks to Kirschtaria, the apostles who would be considered unneccesary after the arrival of the Alien God can continue to live, although for some reason the efforts to communicate with Limbo have been unsuccessful. Muramasa asks which orders their master can have for them, to which Rasputin clarifies him that the Alien God has two interests. Senji is entrusted with the investigation of the spear that is capable of burning the Fantasy Tree in the English Lostbelt. When Muramasa asks the Priest if he is going to act as her bodyguard, Rasputin tells him he is in charge in obtaining a more powerful vessel than the one the Alien God is currently inhabiting. An incredulous Senji is unable to believe there is a stronger vessel for an existence who can be considered supreme, but Kotomine affirms that it actually exists: the Ultimate One of the Oort Cloud.
Lostbelt No. 6: Avalon le Fae
Muramasa is sent by the Alien God to assassinate Morgan, the Lostbelt King of the English Lostbelt. Muramasa beats Fairy Knight Gawain and Fairy Knight Tristan, but he is ultimately defeated by Fairy Knight Lancelot and ends up falling into the the great pit. He survives however and climbs out. Wandering he eventually finds himself in the nameless forest at Cronwall where he promptly loses his memories for a time. After leaving the forest he spends his time as a blacksmith, where after feats of his strength are witnessed he is then captured, to be sold for auction as a slave by Muryan. It is at this time when he recovers his memories, and Muryan attempts to convince him to become hers which he rejects.
A month after Muramasa's arrival Chaldea finally arrives at the Britian Lostbelt where they than get seperated. Joining up with the Artoria of this lostbelt, and a fairy who calls himself Oberon both Ritsuka and Da Vinchi head to Gloucester. Upon reaching there they here rumors that the fairy for auction and sale is the fabeled "Child of Prophecy" who is rumored to save Britian. Described as a powerful fairy wearing foreign cloth and weilding a strange iron weapon, they assume it to be Mash who has been seperated from them. Entering the auction they are shocked at the reveal that it is in fact Muramasa who was supposed to be an enemy. The auctioner state's that due to Muryan's statement of "he's at least 30% a Child of Prophecy", he's attire, and the fact he almost defeated Morgan, the auctioner states that the auction is legitamate, however Oberon claims that it feels like nothing more than a scam. The bidding starts the Chaldea party decide to bid for Muramasa, with Oberon placing Artoria's name as the bidder, which he retorts saying "It would make for a good story the Fake Child of Prophecy being purchased by the Real Child of Prophecy" which Artoria voices her displeasure on. Eventually the bidding reaches a tie with Artoria putting up Oberon's land as colatoral, which now makes it Oberon's turn to voice his displeasure. Muryan asks both buyers to come to the stadium for the final verdict to be decided. Artoria walks up to the stadium where she than faces the competing buyer who it turns out to be in fact Fairy Knight Tristan. Muryan reaveling both Artoria's status as the Real "Child of Prphecy" and Tristan's status as Morgans deemed successor they than contest in a magecraft competition for who will obtain Muramasa. Artoria wins causing Tristan to turn and flee. Muramasa is released and in turn thanks Artoria for granting him freedom.
Because the English Lostbelt is a threat to both the Alien God and to Proper Human History, Muramasa teams up with Chaldea to defeat Morgan. He befriends Lostbelt Artoria, though gets on her nerves quite often. While traveling Muramasa states that he dosen't like working for his employer, and it compelling him to do its bidding, saying it puts a bad taste in his mouth. When the group travels to Avalon to forge Excalibur, which would kill Artoria by making her one with the blade, Muramasa sacrifices himself in her place, allowing Artoria to survive and making him one with Excalibur.
Muramasa claims that he is not qualified to be a Heroic Spirit because as a blacksmith, he lacks the heroic deeds necessary to make him a hero. It is for that reason he is manifested as a Pseudo-Servant in a suitable human body. It is unknown if he is a Heroic Spirit Candidate, Wraith, Phantom, or some other subset of spirit.
Although he claims to be a simple blacksmith and lacking any great military strategy, as expected of a Heroic Spirit summoned by the Counter Force, Muramasa is a very powerful and skillful combatant. He is mentioned as being a swordsman skilled enough to cut even causality. His reflexes are fast enough to dodge Lancer of Purgatorio's spear, who was empowered by the Curse of Annihilation at the time and counter at the same time with his Sword Trial Art, blowing up his entire upper body apart in the process. According to Miyamoto Musashi, Muramasa may be strong, but his is the kind of strength you get by not worrying about protecting yourself. When facing off against a Heroic Spirit Swordmaster, who has the ability to regenerate, it'll end up on a draw. When fighting with just a "pathetic little knife", he is unable to harm Shirou Amakusa even when having the aid of Kotarou.
As a blacksmith, he is confident about his skills as he has reached the territory of God. He is capable of using a Reality Marble of a similar nature to Shirou Emiya's Unlimited Blade Works, utilizing the countless swords within it to forge Tsumukari Muramasa.
- Magic Resistance (B Rank): No information available.
- Territory Creation (A Rank): Muramasa's whole workshop just never stops following him. Senji Muramasa's own workshop ――― acts with a smithy as its base. Obviously it's completely different from that of a mage, but apparently the class skill of Casters was given as an interpretation at the moment of manifesting as a Servant. As the most excellent of craftsmen, he has an exceptional Territory Creation ability.
- Appreciation of Swords (A Rank): A skill similar yet different to Appreciation of the Arts. Comprehension related to armament. With just one glance, he can grasp how to confront ordinary weapons that aren't Noble Phantasms. In the case of the rank being A or higher, it's possible to understand armament other than swords and blades. It works as accurate advice for allies, and perceives the weak ponts of the enemy.
- Contemporary Ill Omen (B Rank): A skill derived from the legends revolving around the katana with the signature of Muramasa, the so-called "Wicked Sword Muramasa". The katana created by Senji Muramasa and his school are said to bring misfortune to the rulers of the Tokugawa family. In FGO, it works as a "special attack against governors/kings".
- Sword Trial (B+ Rank): Trying out the sword. Test slashes, test swordsmanship. A method to measure the sharpness and performance of swords. Senji Muramasa can freely draw out the power endowed to a weapon. If he felt like it, he could even draw out its maximum power to the point of the weapon self-destructing in a single stroke.
- Eye of Karma (A Rank): A dormant ability possessed by the body. A subspecies of the skill Clairvoyance. Improves both static and dynamic visual acuity. Insight specialized only for battle action. With this body he can't set his eyes on destiny like with Clairvoyance… Supposedly, but due to the values of Muramasa, who set his eyes on the "karma" within the flames during his lifetime, the hawk eyes pierce not only the prey, but also their destiny that lies ahead.
- Flame (EX Rank): Casting and forging with one's whole body and spirit, to the point of burning up oneself. "Every astrigency, every longstanding desire, every unnaturality――― Everything in order to reach this single stroke"
- Main Article: Myoujingiri Muramasa
- During the Greek Lostbelt, he was capable of crafting a weapon to strike down Titan Atlas, leaving the void within the Fantasy Tree available for the Alien God to descend.
During the Sengoku era, when a huge number of swords were prepared, several outstanding swordsmiths set up workshops at various places in Japan. At times, they followed the battle, and there were also those who repaired damaged swords in the middle of battles. Among them, the swordsmith from Ise Province, Kuwana, Senji Muramasa, was known as a skilled artisan, and was demanded swords by the warriors of Migawa in special. There is a legend to the katana of the Muramasa school. They are wicked swords, and will bring disaster upon the Tokugawa shogunate.
The katana used to put Ieyasu's grandfather, Matsudaira Kiyoyasu, to the sword, the katana that slashed at the father, Hirotada, the katana that beheaded the eldest son, Matsudaira Nobuyasu, and the katana that wounded Ieyasu himself……
All those katana had the signature of "Muramasa". Excellent swords, and Tokugawa-slaying wicked swords. The fearsome Muramasa. In several kabuki/kōdan, "Muramasa" appear as bloodstained wicked swords. There are also legends to the adversaries of the Tokugawa.
Yui Shōsetsu, who planned to overthrow the Bakufu in the year 1651 AD, was said to be the owner of a Muramasa, and Sanada Yukimura was said to own one as well in "Meishō Genkōroku". During the Bakumatsu, patriots from the movement to overthrow the shogunate, with Saigō Takamori first on the list, sought the Muramasa. At the Boshin War, the governor-general of the Eastern expedition, Prince Arisugawa Taruhito, wore a "Muramasa".
Grand Servant Summoning Circle-During the 5th lostbelt the servants of Pan-Human History, Prometheus-Hepheastus, and the Godbreaker Alliance worked tirelessly to complete a summoing circle that would have enabled a Grand Servant to come forth and aid them. During the final process, Muramasa had arrived to capture Hephastus, but Hephastus threatened to destroy himself before the circle's completion. Not actually wishing to fufill the order he was given, Senji decided to help complete the circle in an attempt to accelerate the process.
Holy Sword-Originally forging the Holy Sword that would later become Excalibur to defeat Sefar and, in the Lostbelt's case, stop Cernunnos would have caused the forger's death by becoming one with the blade...which in the Lostbelt's case was Artoria. When she entered into the Star of the Planet, its heart or core, to forge the Holy Sword, right before the process would cost her life, Senji Muramasa stepped into the Planet's Star, taking her place during the final forging stages and, at the cost of his life, saving Artoria while finished forging the Greatest Holy Sword.
As an Alter Ego-class Servant of the Alien God, Muramasa was fused with a smith known for being able to kill a God, seemingly to be used by the Alien God for being a God Slayer. In gameplay, Muramasa has the God-Slayer Skill at EX Rank.
The Alter Ego-class Muramasa working for the Alien God is specialized in killing Divine Spirits and can show overwhelming power against them, due to the Divine Spirits the Alien God put inside him having being god slayers. However against non-divine enemies he is not nearly as strong, such as when Fairy Knight Lancelot was able to defeat him.
- Fate/Grand Order: Epic of Remnant - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Chapter 4
- Fate/Grand Order Material Book V - Parvati Profile.
- Fate/Grand Order: Cosmos in the Lostbelt - Lostbelt No.6: Fairy Round Table Domain: Avalon le Fae - Chapter 6 Section 1
- Fate/Grand Order: Epic of Remnant - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Chapter 3
- Fate/Grand Order - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Section 4: Inferno (Beginning)
- Fate/Grand Order - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Section 15: The Stage of Carnage, Onriedo (Ending)
- Fate/Grand Order - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Section 5: Inferno (Middle)
- Fate/Grand Order - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Section 8: Paraiso (Middle)
- Fate/Grand Order - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Section 10: Kalasutra Hell (Beginning)
- Fate/Grand Order - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Section 11: Kalasutra Hell (Middle)
- Fate/Grand Order - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Section 12: Kalasutra Hell (Ending)
- Fate/Grand Order - Shimosa Province: The Stage of Rivers of Blood and Mountains of Corpses, Section 14: The Stage of Carnage, Onriedo (Middle)
- Fate/Grand Order: Epic of Remnant Shimosa: Section 15 Ultima Cantica: The Stage of Carnage, Onriedo (Ending)
- Fate/Grand Order: Cosmos in the Lostbelt - Atlantis: Ocean in the Age of Titans, Chapter 13
- Fate/Grand Order: Cosmos in the Lostbelt - Atlantis: Ocean in the Age of Titans, Chapter 10
- Fate/Grand Order: Cosmos in the Lostbelt - Olympus: Interstellar Mountain City, Chapter 17
- Fate/Grand Order: Cosmos in the Lostbelt - Atlantis: Ocean in the Age of Titans, Chapter 26
- Fate/Grand Order: Cosmos in the Lostbelt - Olympus: Interstellar Mountain City, Chapter 15
- Fate/Grand Order: Cosmos in the Lostbelt - Olympus: Interstellar Mountain City, Chapter 24
- Fate/Grand Order: Cosmos in the Lostbelt - Olympus: Interstellar Mountain City, Epilogue
- Fate/Grand Order: Epic of Remnant Shimosa: Section 14 Ultima Cantica: The Stage of Carnage, Onriedo (Middle)
 Fate/stay night [Unlimited Blade Works] Animation Material I - Kinoko and Takashi Q & A, p.041 [T]
Q: Sasaki Kojirou spent his entire live sword training in the mountains, so how did he acquire a sword like the Bitchu Aoe (Blue River of Bitchu)? Was he not spending his time farming on the farmlands?
Q: Sasaki Kojirou spent his entire live sword training in the mountains, so how did he acquire a sword like the Bitchu Aoe (Blue River of Bitchu)? Was he not spending his time farming on the farmlands? <Sunday>
Nasu: Kojirou is the son of a ordinary farming family, living an ordinary farm life and separated from ordinary common sense. Ordinarily He met a master swordsman who had retired deep into the mountains, and began his ordinary life in the mountains himself. He was enthralled by the swordsmanship of the master, and he began training under him the next day. After one month, the master swordsman drew his last breath, and Kojirou completely threw himself into the path of a swordsman. By the way, what the master swordsman talked on about was the refined behavior of a swordsman--a communion with nature, so to speak. He did not instruct Kojirou on anything related to sword techniques. The Bitchu Aoe may have been the master's, or perhaps he received it from the Holy Grail when the legendary soul was summoned. It is simply something thought to be part of who he is.
Takeuchi: So he only witnessed the opening of a performance [referring to swordmanship]... so he's really a genius among geniuses isn't he!?
Nasu: Isn't it obvious. Don't underestimate a chivalrous man person who is eligible as a Servant despite being nameless. He was raised in both mind and body in those mountains. Even without a katana that master swordsman can cut through dimensions. Sengo Muramasa, that which can cut even casualty.
佐々木小次郎は生前ずっと山で剣を振るだけの人生を過こしたそうですが、そうするとどうやって備中青江のような業物を手に入れたので しょうか？というか、ちゃんと農民として農作 業をしたりしてたのでしようか？ ＜Sunday＞
奈：あの男はフツーの農家の子供で、フツーに村の暮らしとか人間の常識からズレていて、フツーに山奥に隠れるように隠居した剣聖に出会い、フツーに山で暮らすようになったんだ。はじめて剣聖の太刀筋を見た時に心奪われ、翌日から弟子入りするも剣聖はひと月ほどで息を引き取り、後はいびつながらも純粋に剣の道を究めた。ちなみに、剣聖が話してきかせたものは剣士としての雅な立ち振る舞いーーー即ち花鳥風月のみ。剣に関しては佐々木某に何一つ教えなかつた。備中青江は剣聖の持ち物か、 あるいは英霊と して召喚された時に聖杯から与えられた。佐々木小次郎としての出で立ち、と思われます。
- Fate/Grand Order: Epic of Remnant Shimosa: Section 3 Prima Cantica: Purgatorio (Ending)
- Fate/Grand Order: Epic of Remnant Shimosa: Section 10 Quarta Cantica: Kalasutra Hell (Beginning)
- Fate/Grand Order material I - Emiya, p.105