The Grail War is a fictional conflict from the Fate series, where mages, known as Masters, summon legendary heroes called Servants to compete for the Holy Grail. The Grail is a powerful artifact that grants wishes, and the war typically involves seven Masters and their Servants battling each other until only one pair remains. Each Servant represents a historical or mythological figure, categorized into classes like Saber, Archer, and Lancer. The conflict is marked by strategic alliances, betrayals, and intense battles, as each Master seeks to claim the Grail for their own desires while navigating the complexities of their Servants' personalities and abilities.