Forging the Trident
Poseidon's elder brother, Hades, who was very skilled in navigating under the earth, led all of his siblings into Tartarus with the intention of freeing their uncles, the Elder Cyclopes (Arges, Brontes, and Steropes) and the Hekatonkheires; or Hundred Handed Ones (Cottus, Gyges, and Briares). All six of them were imprisoned in the maximum-security zone of Tartarus, surrounded by huge bronze walls, and a lava moat, guarded fierce demons. Their guardian, Kampê, was the most ferocious and fearsome monster in all of Tartarus, and even Zeus, Poseidon, and Hades initially shuddered with horror when they saw the infernal monster for the first time. However, the gods overcame their fear, and were able to sneak in. Zeus managed to talk to the Cyclopes Brontes, and convinced him to forge powerful weapons for him and his siblings (which would be more powerful than Kronos' Scythe) behind Kampê's back. Together with his brothers, Steropes and Arges, Brontes forged three incredibly powerful weapons, the second of which was the Trident, which was given to Poseidon. The power of the Trident imbued Poseidon with the "might of a hurricane", and he tested his new mighty weapon by striking the earth, which generated a strong earthquake. Shortly thereafter, after Zeus killed Kampê, Poseidon used his Trident to shatter the chains of the Elder Cyclopes and Hekatonkheires, releasing his six uncles.
Shortly thereafter, Poseidon successfully wielded his new mighty weapon during the subsequent 11-year-long war with his father Kronos and the other Titans. The Titans initially had the upper hand in the battles, since they were much more skillful and experienced warriors. However, Poseidon quickly became a formidable warrior in his own right as well, and greatly contributed to the ultimate downfall of Kronos and his titanic followers. During the final battle, Poseidon used his Trident to generate massive earthquakes, and to defeat any Titan who got in his way.
Poseidon's Symbol of Power
After the Titanomachy, the gods (who now called themselves the Olympians) chose Mount Olympus as their official residence, and Zeus as their King, while Poseidon replaced Oceanus as the Lord of the Seas. Hence, while the Trident remained Poseidon's personal weapon in times of need, it also became his Symbol of Power, along with the horse, the bull, and the dolphin. He wielded the Trident on multiple occasions, most notably while fighting sea monsters, or sinking the ships of mortals who had angered him.
Poseidon is seen wielding the Trident when Percy first meets him, in the Throne Room of Mount Olympus
At the Council of the gods on Winter Solstice, Poseidon sides with his son Percy's judgment. He declares that he wouldn't allow the death of the Ophiotaurus, his Trident appearing in his hand when he was angered.
Although it is shown, the telekhines in Mt. Saint Helens claimed to have made Poseidon's trident.
During the Battle of Manhattan, Percy goes up to Olympus and sits on Poseidon's Throne to try and get his father's attention. Poseidon was about to blast whoever it was that dared to sit on his throne with his Trident, but thankfully looked before doing so and didn't blast Percy.
As the terrifying Storm Giant Typhon started his final charge toward Olympus, he stepped into the Hudson River, from whence Poseidon emerged, with an army of Cyclopes, lead by Tyson. As the Cyclopes wrapped him in heavy chains, Poseidon struck Typhon with his Trident, managing to severely wound and weaken the Storm Giant, before creating a channel of water that pulled the defeated Typhon into the pits of Tartarus.
Poseidon joins the Seven Heroes of Olympus in their final battle against the Giants. He and Percy battle and defeat the Giant twins Otis and Ephialtes, with Poseidon spraying them out of the Athenian Parthenon with a high-powered water blast from his Trident.
It is a three pronged spear with thick energy bolts surging through it. To regular mortals, it appears as a surfboard, fishing rod, or ice cream, when he is by the beach due to the Mist. There is an attachment for Poseidon's trident on his throne, where one would expect a fishing pole on a mortal fisherman's chair.
Through the trident, Poseidon has the ability to control the ocean, shake the earth, and shatter any object. It can also project massive beams of blue light that can transform targets or even outright destroy what it hits. It is shown that when he hits a sea monster, it transforms into a goldfish. In The Last Olympian, the Trident is shown to be powerful enough to instantly destroy a giant squid, which was "larger than any skyscraper", dissolving it like "food coloring". Poseidon later told Percy, "If I hadn't looked before I blasted, you would be a puddle of sea water". It is also said that earthquakes are caused when Poseidon strikes his trident into the ground. That is why Poseidon is called "The Earthshaker". Furthermore, since he also uses his Trident to call up sea storms, Poseidon is also referred to as "The Stormbringer." The Trident was also the only weapon to significantly injure Typhon during the Olympians' final battle with him.
- The trident is the astronomical symbol of the planet Neptune.
- The telekhines in Battle of the Labyrinth claim to be the creators of Poseidon's trident, yet this is contradicted in Percy Jackson's Greek Gods where the creators of the weapon is stated to be the Elder Cyclopes respectively.
- In myth, the most common origin for the trident is it was created by the Elder Cyclopes along with Zeus' Master bolt and Hades' Helm of Darkness. The books use the less common story of the Telekhines forging it. It is able to control all bodies of water.
- It is only rivaled by the Master Bolt and the Helm of Darkness.
- It is the only Symbol of Power of the Big Three that wasn't stolen by Luke.
- As shown in Percy Jackson's Greek Gods, Poseidon used the Trident to smash the chains of the Elder Cyclops and Hekatonkheires, freeing them from Tartarus.