Harpe Kronos

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Divine gulf of Adamas^WP.
Prayer of immortal birth.
A single flash......shall blaze here and now!
Harpe Kronos!

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(-Medusa (Child) in Fate/Grand Order -turas réalta- Ch. 82)

Harpe Kronos: Divine Gulf of Immortal Birth (蒼天落陽る深淵の河(ナム・アブス・グガルアンナ), Fushi Kaeshi no Kamiwan(Harupē Kuronosu)^?) 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.

Harpe Kronos killing Gorgon.
Gorgon starting to crumble.
Ana crumbling.

Medusa makes use of this Noble Phantasm to finally defeat Gorgon by stabbing her in one of her Mystic Eyes. At that moment the two started to crumble as they are the same person.