One of the main protagonists of Fate/Apocrypha alongside Jeanne d'Arc. He is a nameless homunculus created by Gordes Musik Yggdmillennia who becomes the secondary master of the Rider of "Black" after gaining a consciousness and escaping from the Black faction. He would later be given the heart of Siegfried in order to save his life, allowing him to temporarily shapeshift into him in combat and giving him his moniker.
