Manaka Sajyou

Manaka Sajyou was a legendary magus and the elder sister of Ayaka. During the previous Holy Grail War, she died while serving as Saber’s Master. While her father intended for her to reach the Root, Manaka secretly sought to summon the Beast through human sacrifice. Following a betrayal by her own Servant, the Grail resurrected her as the Seraphim. Now acting as the story's ultimate antagonist, she remains obsessively devoted to her "Prince" and will do anything to reunite with him.