Master sword

The Master Sword  (マスターソード Masutā Sōdo? ), also known as "The Blade of Evil's Bane" and the "Hyrule Sword", is a  magic sword  that often acts as the ultimate weapon for  Link  as the chosen hero to defeat  Ganon  and doubles as a key to the Sacred Realm. First introduced in  A Link To The Past, it has the power to "repel evil", which enables it to overcome powerful dark magic and evil beings and keep them from using the sword. In  The Legend of Zelda: Skyward Sword, the blade originally began as the Goddess Sword which has a sentient female avatar named Fi integrated into it. Eventually, the Goddess Sword transforms into its current state after being infused with the Three Sacred Flames with Fi ceasing to be once the Master Sword absorbed Demise's remains. 