Silver Arrow

Silver Arrows are recurring items in the Legend of Zelda series. These arrows, made entirely from silver, are the only weapons that can defeat Ganon in the games in which they appear. They are replaced by the Light Arrows in later Zelda games.

The Legend of Zelda
Silver Arrows are one of the treasures of Level 9 (Spectacle Rock), the other being the Red Ring. Link must have the Silver Arrows in order to defeat the final boss, Ganon, and save Princess Zelda. Link must strike Ganon with his sword several times (the exact number depends on the strength of the sword); on the final Ganon will turn red and stop moving briefly. At this point, Link must then shoot him with a Silver Arrow to destroy him and save Princess Zelda.

The Legend of Zelda: A Link to the Past
The Silver Arrows are not separate items; rather, they are upgrades of Link's regular Arrows. After Link has defeated dungeons five and six in the Dark World, he can purchase a Super Bomb from the Bomb Shop (located exactly where Link's House was located in the Light World.) This can be used to break a cracked wall in the Pyramid of Power, revealing a mysterious fountain inside. If Link throws his Bow & Arrow into the fountain, a Great Fairy appears, asking him about whether or not he dropped it. If Link answers truthfully, he is given the Silver Arrows.

After defeating the remaining dungeons, the Seven Maidens will make it possible for Link to confront Ganon. During the confrontation, Ganon is stunned for a short while, allowing Link to damage him with a Silver Arrow and ultimately defeat him, and restore peace and prosperity to Hyrule.

The Legend of Zelda: A Link to the Past manga
In the manga version of A Link to the Past, the arrowheads of the Silver Arrows are worn by Ganty, a Hylian Knight descendant, as earrings. They were given to her as an heirloom by her guardian to pierce evil. When Zelda told Ganty of her true heritage and the purpose of the earrings she wore, Ganty used the arrow to deal Ganon a death blow.