Bazett Fraga McRemitz is the original Master of Lancer during the Fifth Holy Grail War. She was sent from the Mage's Association, but was betrayed by Kirei Kotomine and left fatally wounded. Her life is saved by Avenger, and she acts as his Master during Fate/hollow ataraxia. 

Bazett was born in Ireland as a descendant of an old family of magi that had detached itself from the Mages' Association and lived in the shadows quietly. Wishing to pursue a different path than that of her ancestors, she chose to join the Association. Despite Bazett's rare lineage, her skills were not judged as being particularly useful and she was dismissed. Instead, she employed her abilities to become a hunter of those that had been given a Sealing Designation.

During her missions, Bazett met Kirei Kotomine, a member of the Church. As she told him her story, she quickly came to trust him and was very happy when he invited her to become a Master in the 5th Holy Grail War. When the opposing faction of the Association sent an observer, Bazett killed the magus. However, after she summoned the Servant, Lancer by using Cu Chulainn earrings as a catalyst. She prepared to join the War but she was betrayed by Kotomine, who stole Lancer's command spell and chopped off her left arm. Having only lived to fight for four days in the Grail War, Bazett was left to die.