Trident of Poseidon

In Greek mythology, Poseidon's trident was forged by the cyclopes according to Pseudo-Apollodorus's Bibliotheke.
Poseidon wields his trident on a number of occasions. He used his trident to strike a rock upon the hill of the Acropolis, producing a well of seawater, in what developed into a contest between him and Athena over possession of Attica. When he lost, Poseidon used the trident to dry out the land so they had no water. The well was later to be called the Erechtheis. There is further myth that Poseidon produced a horse by striking the earth with the trident, in order to bolster his claim, but there is no attestation for this among Greek writers. The alleged trident print on a rock and the sea well within the Erechtheion were witnessed by the geographer Pausanias while visiting Athens.
In another myth, Poseidon creates a spring or springs with the strike of his trident to reward Amymone for her encounter with him. In a version of another myth Poseidon wields his trident to scare off a satyr who tries to rape Amymone after she mistakenly hits him with a hunting spear.
There is also a myth where Poseidon touches the island of Delos with his trident, affixing it firmly to the sea floor. Another myth tells how Poseidon, enraged by sacrilegious behavior of Ajax the Lesser, splits with trident the rock to which Ajax was clinging.
The oldest coins of Poseidonia from the 6th century BC depict trident wielded by Poseidon in his right hand, similar to Zeus's thunderbolt. An Attic red figure kylix from c. 475 BC depicts Poseidon killing the Giant Polybotes with his trident.
However, in world the Trident of Poseidon is another extremely powerful artefact, giving the weilder mastery over the seas, storms and all the creatures that subsist in the ocean. As of now it still seems to be in the capable hands of Poseidon deep within the ocean, as far as anyone knows...