The Master Sword is an item used in the Legend of Zelda Series. It first appeared in The Legend of Zelda: A Link to the Past, where Link would be able to collect it after getting three pendants scattered throughout Hyrule to prove that he is the Hero of Legend. It would later appear in mostly every Legend of Zelda game after it, most recently The Legend of Zelda: Breath of the Wild. The Master Sword is the bane of evil and only those pure of heart may wield it to defeat the evil that is Ganondorf.
It was revealed in The Legend of Zelda: Skyward Sword that the sword used to be known as the Goddess Sword and was forged by the Goddess Hylia with the hope that her future hero would forge it into the Master Sword and use it to defeat Demise, which explain why it is effective against Ganon who is born of Demise's influence. In this game, the sword also gained a consciousness named Fi who went asleep after Demise's defeat but still sometime manifests as a "voice" in the Master Sword even by the time of Breath of the Wild.
Mario Kart 8
In Mario Kart 8 and Mario Kart 8 Deluxe, the Master Sword can be seen resting in a pedestal at a crossroad inside Hyrule Castle in the Hyrule Circuit. It acts as a Spin Boost Pillar, but is initially inaccessible. On the track leading to the sword, there are three spin boost crystals that, when activated, cause the sword to rise up from the pedestal along with a Dash Panel ramp that allows racers to go through it and receive a spin boost. Link also pulls out the Master Sword during some of his tricks.
Super Mario Maker 2
The Master Sword was introduced as a regular Power-Up in the 2.0 update of Super Mario Maker 2. It only appears in the Super Mario Bros. style and has the main effect to turn Mario, Luigi, Blue Toad or Toadette into Link. In this form they can uses Link's Bombs to blow up obstacles, the sword itself to attack enemies, the Bow to throw projectiles with precision, a down thrust, a shield, and a dash attack.
- It has been speculated, but not proven, that the Magical Sword is the original Master Sword.