In The Legend of Zelda, the Master 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. This master swordsmith has forged a real-life version of the weapon. Continue reading for a video.
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.