The Blood Sword is a weapon in Final Fantasy XII. Blood Sword has its own license on the board, a right usually reserved to the rarest and most powerful weapons of each set.
The Blood Sword does not have its drain HP trait as it does in other games, however, its attack guarantees that Sap will be inflicted upon the opponent unless they are immune.
A stronger version, Karkata, has 100% chance of inflicting Confuse on a target; it can be bought from the bazaar. Both weapons can be equipped by the Knight, and by the Bushi after acquiring Zalera.