When the blacksmith’s apprentice, Link, is asked to deliver a sword to the castle guard Captain, he finds himself face-to-face with the evil Yuga as he attacks Ceres, a descendant of one of the Seven Sages. Yuga traps Ceres inside a painting, but is also armed with even stranger magic:¬†Yuga can become a painting and move inside the walls.

Yuga continues to attack and capture the descendants of the Seven Sages, and erects a barrier preventing access to Hyrule Castle, where Princess Zelda resides. There is only one way to break the barrier surrounding Hyrule Castle and rescue Princess Zelda: Link needs the Blade of Evil’s Bane, the Master Sword.

A Link Between Worlds on Zelda Wiki