Enemy Avenger (The Black Grail)

A homunculus created by the Einzbern family who stood as the head of the family in the time before the Holy Grail Wars.

She was an extremely close friend of the head of the Matou family, Zouken, who was so broken by her sacrifice to become one with the Holy Grail that he studied a way to find immortality, so he could see that their shared dream of a utopia would one day be fulfilled.

Justeaze was also acquainted with Nagato of the Tohsaka’s and one of the greatest mages who ever lived, the master of the Second True Magic, Kischur Zelretch Schweinorg. With their help, Justeaze and Zouken devised the ritual and rules of the first Holy Grail War, using Justeaze as the key.

All other homunculi in the Einzbern family are designed after her appearance.