Trident

The Trident is a weapon from The Legend of Zelda: Four Swords Adventures. This ancient weapon crafted for evil purposes is wielded by Ganon, after Ganondorf steals it from the Pyramid in the Desert of Doubt in order to become more powerful. Upon seizing it, Ganondorf turns into the beast Ganon. The Trident grants its wielder the power to send beings to the Dark World at will, among other abilities. During the final battle, Ganon attempts to kill Link using the Trident, but is ultimately sealed into the Four Sword.

History
The Trident's origins are explained while Link is exploring the Desert of Doubt in search of the purple maiden. Upon entering the desert, they meet the Gerudo tribe and learn that Ganondorf had previously left for the ancient Pyramid, noted by both the Gerudo and the Zuna to be a sacred place. Although the Gerudo felt that Ganondorf would fail to reach the Pyramid, he ultimately succeeds, as Link later discovers.

Along the way, Link meets the Zuna tribe, who are the descendants of the Pyramid's builders. They speak of a great evil power that is said to rest within the Pyramid's depths. After learning of the Pyramid's history, Link passes through the Desert Temple and enters the Pyramid. After navigating it and defeating Dagtail, Link arrives at the Trident's chamber. The inscription near the stone slab states that the Trident it had contained contains an evil spirit that would fill the Trident's holder with evil power, making them worthy of the title of "King of Darkness."

Other possible appearances
What may be the Trident has appeared in other games in the series. In The Legend of Zelda: A Link to the Past, The Legend of Zelda: Oracle of Ages, and The Legend of Zelda: Oracle of Seasons, Ganon wields a trident. Artwork of Ganon from the original The Legend of Zelda also depicts him with a trident. It is possible that Ganondorf stole the Trident before the events of Four Swords Adventures, and possesses it throughout most games.

Ganon also carries a trident in the noncanonical Satellaview games BS Zelda no Densetsu and BS Zelda no Densetsu Kodai no Sekiban. Additionally, in The Legend of Zelda: Ocarina of Time, Ganon wields two trident-like weapons, while Phantom Ganon fights with a trident. In The Legend of Zelda: Twilight Princess, Midna one point uses a trident-like weapon while in her Fused Shadow form.