User: Gilgamesh
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.

Fate/complete material II; Weapons: Harpe, pg. 135