She was conceived between Artoria and her sister, Morgan le Fay , through unorthodox circumstances. Artoria, normally female, was a pseudo-male at the time due to Merlin 's magecraft in order to consummate her marriage with Guinevere. During this time Morgan enchanted Artoria with a spell to extract sperm from her. Morgan developed it within her own ovary, and made the child into a homunculus clone of Artoria. Due to her status as a homunculus, she was given a much faster growth period than a regular human being, and her life span was far shorter.