Illyasviel Von Einzbern -

: Her body is 70% Magic Circuits, giving her a nearly unlimited supply of mana .

: Initially an antagonist, she eventually joins Shirou's household and lives peacefully after Berserker is defeated. Illyasviel von Einzbern

Illya is widely regarded as the most skilled Master in the history of the Holy Grail War due to her unique physiology: : Her body is 70% Magic Circuits, giving

: She plays a smaller role and meets a tragic end at the hands of Gilgamesh , who removes her heart to use as a core for the Grail. Illyasviel von Einzbern

Her fate varies significantly depending on the timeline of Fate/stay night :

: This immense power allows her to effortlessly control the legendary hero Heracles, even when he is summoned under the Mad Enhancement class.