The phrase "master sword" refers to a powerful and legendary weapon, typically associated with a skilled swordsman or the main character in a heroic story or game. Full definition
That's a lot of Master Swords, bows and arrows, puzzle - solving and fire dungeons to work through, but Skyward Sword manages to feel fresh. (snackbar-games.com)
Zelda master get master sword and go to the stable nere the colasium a girl nere a tree will give you a star fragment (grouvytoday.com)
Faced with the constant threat of death, they knew it was not enough to simply master sword techniques. (educationworld.com)