Dusk Claymore

The sword of the sages was a magical sword of light used by the Sage of Water in The Legend of Zelda: Twilight Princess. The sword was thrust into Ganondorf's chest in hopes of executing him. The attempt was in vain thanks to the Triforce of Power in Ganondorf's hand. Taking no harm but a glowing wound in his chest, Ganondorf took the sword and killed the Sage. Ganondorf kept the sword and used it later in the game in the final battle with Link. The sword's shape seems to boast a type of long sword, though its size suggests that it is more of a katana-like blade instead. You can also note that when looking at the blade while Ganondorf is weilding it, the color changed from white to a glowing red.

It is suspected that in Twilight Princess, Ganondorf continues to carry the Sword of the Sages because he wants the Sages, who attempted to execute him, to see what has been done with their own blade.

"An impressive-looking blade... But nothing more. Would you hear my desire? To take this foul blade...and use it to blot out the light forever!"

- Ganondorf (implying that he does not particularly like the sword he is using.)