King Triton's Trident

The Trident is a weapon that is featured in The Little Mermaid franchise. The Trident has three prongs, and appears to be made out of gold. It is shown to have vast magical abilities, and thus has been desired by both Ursula and Morgana. It serves as the personal weapon of King Triton, and only Triton or one of his descendants remove it from its resting place. Once it has been removed, there seem to be no limits on who can use it. It can even be used against the royal family

Powers
The trident is shown to have various applications, depending on the will of the user. Most commonly seen is its ability to fire destructive energy bolts. These energy bolts, however, must be fired immediately upon the ready, or they will cause the built up energy to backfire on the user. This is ultimately how Ursula was killed, as she attempted to fire an energy ray at Ariel that was implied to be unavoidable, but was impaled seconds before she could fire by Prince Eric and one of the ships, causing the energy to backfire on her. Triton has also used it to summon rain storms, and transform his daughter,  Ariel, into a human. He is also seen creating a rainbow in the first film, and disintegrating the sea wall in the second film. Ariel uses it herself in one episode of the television show, to thaw dinosaurs that have been trapped in a glacier, and it is revealed that the Trident is activated simply by the will of the user. When the trident is in Ursula's possession, she creates a giant whirlpool in the ocean that has such force that it raises sunken ships from the ocean floor.