The Magical Sword is a weapon from the original The Legend of Zelda. It is the most powerful sword that Link can obtain in the game. An Old Man found in the Graveyard offers Link this sword. Link continues to wield this weapon in Zelda 2: The Adventure of Link, the game's direct sequel.
The Magical Sword returns in Hyrule Warriors as the strongest version of Link's basic sword and shield weapon set. It's design is heavily inspired by the box art for Zelda 2.