The Master Sword, also known as the Blade of Evil's Bane, Sword of Resurrection and the sword thats seals the darkness, is a recurring legendary Sword in the Zelda series. Originally crafted by the goddess Hylia as the Goddess Sword, it was later forged into the Master Sword by the Goddess's chosen hero and its spirit, Fi, who bathed it in the three Sacred Flames located across the land that would become the Kingdom of Hyrule. Din's Flame in particular imbued the sword with the Power to Repel Evil, a power augmented after the Sword received the blessing of Zelda, which transformed the blade into the True Master Sword. It is usually the only Sword that can defeat Ganon in the games it appears in.
The Sword is often seen to choose or accept its master by its own will, always a hero who has gone through great trials that test his courage, wisdom and power to prove him worthy of wielding it. This may be the conscious choice of the sword's spirit, Fi, who sleeps eternally within the sword and only assists her heroic master.