Harpe

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 , 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.Fate/hollow ataraxia - 10/08 - Emiya's - Mirror of KibisisFate/Grand Order material IV - Medusa (Lancer), p.342-351, translated by castor212, Beast's LairFate/Grand Order - Babylonia: The Absolute Frontline in the War Against the Demonic Beasts - Section 15: Decisive Battle 
Ana slicing Gorgon's Snake Hairs.gif|Ana using Harpe to slice Gorgon's Snake hairs.
Ana using Harpe on Gorgon.gif||Ana using Harpe to defeat Gorgon.
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.Fate/Grand Order: First Order It is implied the reason behind Medusa as a Lancer is summoned with the immortal-killing scythe is the result of some ability to incorporate "elements similar to their cause of death".Fate/Grand Order - Medusa (Saber) Profile - Translated by Konchew
Harpe's anti-immortality was originally a disruptor for use in interstellar combat, a function to break apart atomic bonds.Fate/Grand Order - Event: Castle of White Sky, Castle of Black Night - Chapter 19 It was an Authority of Zeus which he used in his battle with Typhon, and Typhon stole it from him.The Adventures of Lord El-Melloi II Volume 3: The Devil of the Wandering Sea (Lower) - Chapter 6 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.The Adventures of Lord El-Melloi II Volume 3: The Devil of the Wandering Sea (Lower) - Epilogue
==Harpe Kronos==
 is the third Noble Phantasm of Medusa in her child form. 
Following her arm being petrified by Gorgon's Pandemonium Cetus, Merlin was able to directly connect Harpe to Medusa's arm via magecraft and create this Noble Phantasm. While it possesses the same properties as its previous form, it has been transformed into a Broken Phantasm.
Medusa's Harpe Kronos kills Gorgon.jpg|Harpe Kronos killing Gorgon.
Gorgon crumbling.jpg|Gorgon starting to crumble.
Ana crumbling.jpg|Ana crumbling.
Medusa makes use of this Noble Phantasm to finally defeat Gorgon by stabbing her in one of her Mystic Eyes.Fate/Grand Order -turas réalta- - Chapter 81: "Seventh Singularity 20" At that moment the two started to crumble as they are the same person.
==References==
vi:
Category:Noble Phantasms
Category:Swords
Category:Unclassified Noble Phantasms
Category:Unknown rank Noble Phantasms
Category:Scythes
Category:Divine Authorities
Category:Noble Phantasms introduced in Fate/stay night
Category:Noble Phantasms in Gate of Babylon
Category:Noble Phantasms of Perseus
Category:Noble Phantasms of Medusa
Category:Noble Phantasms of the Twelve Olympians/Machine Gods
Category:Noble Phantasms in Unlimited Blade Works