Immortal Slaying Scythe, Harpe (不死身殺しの鎌・ハルペー, Fujimi Koroshi no Kama - Harupē?) is a divine sword from Greek Mythology used by Perseus to kill the Gorgon Medusa and one of the many weapons inside Gilgamesh's Gate of Babylon. It is described as a monster-killing holy sword with a special shape similar to a scythe, having the cutting edge on the inside of the blade, though it isn't actually an outstanding sword by itself. Its true strength is its trait of Refraction of Longevity (屈折延命, Kussetsu Enmei?), which is a divine ability that nullifies the "undying attribute" of immortals and inflicts wounds that cannot be restored by any methods other than healing in accordance to the natural laws. It is one of the five Noble Phantasms given to Perseus, the greatest amount of legendary artifacts given to a single person in Greek history, for his quest to slay Medusa. It was given by Hermes, and as it was returned to him once the task was completed, it can be called an “Anti-Medusa” weapon.
Medusa in her child form as a Lancer wields Harpe as her primary weapon for combat. With it, Ana was capable of stripping Gorgon of her immortality in Babylonia Singularity. Medusa Alter also wields the scythe Harpe as her primary weapon.
Harpe was an Authority of Zeus which he used in his battle with Typhon. Typhon stole it from him. Bai Ruolong, a magus of the Wandering Sea fed the flesh of Typhon and in possession of his Dragon Core, should possess the capacity to utilize Harpe, but makes no attempt to utilize it in his second battle with Ergo even though it could have changed the outcome of the fight in his favor. Lord El-Melloi II's analysis of the battle causes him to theorize Bai Ruolong may not have access to all of Typhon's Authorities, the cost of deploying Harpe would have taken too much energy to utilize, or Bai Ruolong personally did not want to use it in that fight.
 Fate/complete material II: Character material - Weapons: Harpe, p.135
A divine sword from Greek mythology. One of the Noble Phantasms owned by Gilgamesh. It has a special shape similar to a scythe, with the cutting edge on the inside of the blade. It also has the power to negate the “undying” attribute. The hero Perseus received the sword from Hermes, so that he could exterminate the snake-haired witch Medusa. The legend goes that Perseus approached Medusa – who would turn everybody that looked at her into stone – by using a mirrored shield, and then cut off her head with Harpe while she slept. Because Perseus returned Harpe to Hermes once the task was completed, it can be considered an “Anti-Medusa” weapon.
ギリシャ神話に登场する神剣。ギルガメッシュが所蔵する宝具のひとつ。鎌のような特殊な形状をしていて、 内側に刃が付いている。また、この剣には不死属性を無効にする力があるといわれている。髪の毛が蛇となって いる魔女メデューサの退治に向かう英雄ペルセウスに、オリンポス十二神のヘルメスが与えた。ペルセウスは、 見たものすべてを石に変えてしまうメデューサに対して、鏡の盾を使って近づき、眠っているメデューサの首を ハルペーで切り落としたと言われている。その後ペルセウスはハルペーをヘルメスに返還したため、対メデュー サ専用武器と言える存在となっている。
- Fate/hollow ataraxia - Mirror of Kibisis
 Prototype material - CHARACTER Profile: Rider, p.040-041
- Addresses self as: “Boku”
- Servant Rank: Rank 5
- Strength: D+
- Endurance: E+
- Agility: B+
- Magic: B+
- Luck: A+
- Noble Phantasm: A B C D E
Comment from Takeuchi Takashi: When compared, a lot of spoilers appear. His design is quite rare, which I really like. When he’s wearing his school uniform, he’s an interestingly two-sided character.
Explanation: A Servant who lost his Master. Often dresses up as a student. Is in the same year as Ayaka. Has gentle looks, and at first glance is a trendy, nice looking man. Although he has sociable manners, is easily moved, and is a gentle hearted young man, he has the flaw that, once motivated to do something, he will not stop until he gives it his all and then some more. In this sense, he is also an anomaly.
Once he decided to stain his hands with wrongdoing, he became capable of killing innocents with a gentle manner and smile. His true name is that of a hero from Greek mythology, Perseus. Among the Servants, only he obtained an ending that wasn’t a “bad end”. Although he possesses numerous Noble Phantasms, he is restricted to only being able to use one at a time. The flying winged sandals, the mantle which changes its wearer’s appearance (in the myth it is a helmet), the mirror shield bestowed by Athena (radar, sonar), the serpent-hunting sickle Harpe (kills immortals), the bag that held the demon’s severed head, Kibisis (Mirrored bounded field), and finally the same pegasus’ bridle as in Fate/Stay Night (Bellerophon).
Comment from Takeuchi Takashi:
- Addresses self as: “Boku”
 Fate/Prototype Tribute Phantasm, p.024-025 - Rider
“…For him, who wished for the happiness of everyone—For his sake, I will slaughter you all.”
“The Holy Grail is excessive for the tastes of the magi. As a Heroic Spirit, I will use it correctly, the way it was meant to be used.”
A Stray Servant with no Master. His true name is the hero from Greek Mythology, Perseus. Though he is the only one of the seven summoned Servants to not have a “tragic end”, he welcomes gory deaths even as the form of the boy, who wished only peace for everyone, buries itself in his heart and drives him on his insane killing sprees. He owns a wide selection of Noble Phantasms, like the Sandals that fly through the air, the Mantle that changes the appearance of the wearer (a helmet in the myths), the bronze mirror shield that Athena gave him (equipped with radar and sonar), the snake hunting sickle Harpe (kills immortals), the bag that stores the head of monsters Kibisis (a mirror world type bounded field), and the familiar Pegasus-handling bridle from FSN, Bellerophon. He is the very person who killed FSN Rider (Medusa).
Armor and Mask: When acting as a Servant, Rider hides his true form behind a mask and a cape. This cape is a Noble Phantasm that can obscure the appearance of its wearer. Though Rider holds a large variety of Noble Phantasms, he has a limit that allows him to use only one at a time.
The Mask acts as a fake Master, supplying him with magical energy. In order to get enough magical energy, Rider has to kill again and again (most likely to eat souls so he can get power). His Master, on the verge of death, gave him a physical form, which he used to challenge Saber, but…
Usually, he disguises himself as a normal high-school boy in Rider’s class. He’s the popular boy of the class due to having a modern sort of beauty, getting along well with others, and being gentle. The scenes of him at school show his two-faced nature.
When showing his true face, Rider never wipes away his smile. In his heart, he knows this is the opposite of what the boy wanted, but for the sake of his Master’s happiness, he would kill again and again. What sort of expression is he showing on the face streaked with bloody tears that will not stop?
 Fate/Grand Order - Medusa (Lancer) Profile [T]
Medusa - Lancer
Illustrator and Voice actor
Voice Actor: Asakawa Yuu
Noble Phantasm: A+
Beautiful Voice of Fascination: B
Monstrous Strength: C
Feelings Towards the Distance: A
Magic Resistance: B
Goddesses Divine Core: A
Caress of the Medusa: Embrace of the Goddess
Type: Anti-Unit Noble Phantasm
The youngest of the Gorgon Sisters that appears in Greek Mythology.
A goddess born as a perfected "image (idol)", the embodiment of men's longing.
Due some factor, the anti-hero Medusa acquired a condition as a goddess that is close to that of her two sisters and manifested as a Servant.
Level 1 Bond
Source: Greek Mythology
Alignment: Neutral Good Gender: Female
Her personal statement is that her weight “is the same as my sisters”
Level 2 Bond
Her appearance is that of a lovely girl similar to her sisters, and the personality has also changed from when she is a Rider.
However, unlike her sisters who are “eternal young girls that cannot live on unless they borrow the help from another”, she is already endowed to some extent with the power to fight, the demoniac buds that can take many lives.
Level 3 Bond
"Embrace of the Goddess"
Rank: B Type: Anti-Unit
Caress of the Medusa.
The abilities that up until now Medusa (Rider) had possessed as skills - in other words, that which the current Medusa should acquire in the “future” - attained as a Noble Phantasm.
After haunting with the immortal-slayer blade on her hands, she instantly turns the opponents within her line of sight into stone - an effect by means of mystic eyes of the highest level, “Cybele”.
She performs a fierce attack with this at its focal point.
Level 4 Bond
- Beautiful Voice of Fascination: B
The same personal skill that her sisters possess.
It works as a fascination magecraft-like effect towards males, but evasion is possible by means of the skill Magic Resistance. Even without Magic Resistance, one should be able to abate it so long he maintains a will to resist.
Level 5 Bond
- Monstrous Strength: C
The ability to temporarily amplify STR. An offensive special quality that only monsters, magical beasts have. It is possible to temporarily raise STR in 1 Rank by an amount of time that depends on the rank in this Skill.
...rank is low because her demoniac disposition is small.
- Feelings Towards the Distance: A
The distance that might have been someday---
The feelings towards those beloved days support her struggle to the very end.
A divine spirit-type of Servant that originally would never be summoned.
She manifested during the crisis of the demise of human history, but...
Since she was summoned at Chaldea, there is probably at least two individuals she wants to meet.
At first she will be unable to easily get close to them, and will probably only be manage to stare at them at a distance while shedding tears, but lets just watch over without rushing things.
メドゥーサ - ランサー
- Beautiful Voice of Fascination: B
- Fate/Grand Order material IV - Medusa (Lancer), p.342-351, translated by castor212, Beast's Lair
- Fate/Grand Order - Babylonia: Section 15 Decisive Battle
- The Adventures of Lord El-Melloi II Volume 3: The Devil of the Wandering Sea (Lower) - Chapter 6
- The Adventures of Lord El-Melloi II Volume 3: The Devil of the Wandering Sea (Lower) - Epilogue