White Sword of the Sky

Crafted by the Goddess Hylia, the Goddess Sword is a legendary blade featured in Skyward Sword, which is later tempered into the Master Sword by Link. It is inhabited by a spirit known as Fi, who aids Link throughout his journey so that he may fulfill his role as Hylia's chosen hero.

History

 * See also: Master Sword

The goddess Hylia created the Goddess Sword and Fi, an intelligent humanoid spirit who resides in the sword, and gave it the purpose of assisting Hylia's chosen hero. She then enshrined the sword Inside the Statue of the Goddess before raising it into The Sky as part of Skyloft.

Preceding the Wing Ceremony, Fi appears to Link in his dreams, foretelling him of his destiny. After Link and Zelda are attacked by a black tornado, Link wakes up in his room, where he hears Fi speaking to him. Fi guides him to the Inside of the Statue of the Goddess, further explaining his fate as the chosen hero and encourages him to draw the Goddess Sword from its pedestal so that Fi can formally acknowledge him as her Master. Fi gives Link the Emerald Tablet and tells the young hero that he must go beneath the clouds in order to find Zelda and fulfill his destiny, with the tablet illuminating the path ahead.

After Link receives the Goddess's Harp from Zelda, the young hero must temper the Goddess Sword using the three Sacred Flames in order for it to hold the necessary power to open the Gate of Time at the Sealed Grounds. Each time Link bathes the Goddess Sword in one of the flames, the sword is empowered and is physically altered, giving it new powers. First, Farore's Flame converts it to the Goddess Longsword, which has doubled attacking power and greater reach. Then, Nayru's Flame converts it to the Goddess White Sword, which adds the ability to dowse for Rupees, Treasures, Gratitude Crystals, and Goddess Cubes. Finally, Din's Flame converts it to the Master Sword, with three times the original Goddess Sword's attacking power and a faster charge time for Skyward Strikes. However, this Master Sword resembles the Master Sword as it is first seen in The Wind Waker, in its weakened state.

The final change to the sword takes place in the past, before Zelda enters into a deep sleep to keep the seal placed upon Demise intact. Her blessing converts it to the True Master Sword, with the familiar Master Sword appearance seen throughout the series: the cross-guard's position extends outward, and the gem and the Triforce symbol are restored. With this final transformation, the sword becomes able to harm and defeat Demise.

Powers and Abilities
The Goddess Sword houses a spirit, Fi, who guides Link in many ways, such as giving him helpful advice or actually pointing him in the direction he needs to go. When Fi has something to say, the sword begins to glow, and Link can speak to Fi at any time by pressing down on the D-Pad. Moreover, the sword has a treasure-seeking ability called Dowsing. It can sense important people and items and help Link to locate them, acting as a sort of compass. Link can choose in the Dowsing menu which specific object or person he wishes to track down. The closer Link gets to the target, the faster the sword will beep.

If Link holds the sword up to the sky, it will be charged up by "energy from the heavens" and be able to release a Skyward Strike once it's swung. This beam can activate the various objects that the goddess specifically left for the hero, such as Goddess Cubes, Goddess Walls, and Goddess Crests.

Theory

 * The presence of the Sages' emblems in the vestibule of the Sealed Temple (known in the past as the Temple of Hylia) is interpreted by some fans to mean that the ancient Sages crafted the Goddess Sword along with Hylia.
 * Hylia's primary antagonist, the Demon King Demise, possesses a sword that seems strikingly similar to the Master Sword. It remains unexplained whether the blade wielded by Her Grace and her chosen hero was specifically created to counteract Demise's weapon or vice versa. This is made further unclear by the fact that Fi and Ghirahim are similar humanoid beings accompanying each sword.