Trident

The Trident is one of Ganon's weapons. He is seen wielding it in Four Swords Adventures, A Link to the Past, Ancient Stone Tablets and the Oracle Series.

In Four Swords Adventures, the Trident is held in the Pyramid level, and has an inscription nearby: "We grant you power to ruin the world. The power of darkness. Evil spirit of magic trident.You are the King of Darkness."

- inscription

The inscription would mean that the trident is the exact opposite of the Master sword. The Master sword being the ultimate light weapon while the trident is the ultimate dark weapon.

Phantom Ganon in Ocarina of Time is also seen wielding this trident.