Thanks to the release of the final Aquaman trailer, we know a major portion of Warner Bros.' movie will focus on Jason Momoa's Arthur Curry and Amber Heard's Mera tracking down and retrieving a mysterious trident that only the true sea king of Atlantis can wield. Judging by the relic's design, and the way it's revered by the characters familiar with it, it seems to be the famous Trident of Poseidon.
Though the trailer never refers to it by this name, when Arthur tells Vulko (Willem Defoe), he already has a weapon -- pointing to the quinquedent he used in Justice League -- Vulko replies, "Not like this one, you don't." This, undoubtedly sets him and Mera off on their desert journey to recover the trident, but the question remains: Why is this weapon so important to Arthur's quest to uniting the surface world and his underwater kingdom. Well, we'll have to revisit DC's New 52 run of Aquaman in 2011 to understand why it's such a big deal.
When Cullen Bunn took over writing duties for the title, he was building on what Geoff Johns, Ivan Reis and Co. did in reestablishing Atlantis and how it spawned offshoot kingdoms in its name. As Aquaman struggled with his duties as ruler, he failed to kill off a threat to Atlantis, leading his people to chastise him, which saw him leave Mera and his people behind to embark on a journey on self-discovery. He fled to the Aegean Sea and the temple of Poseidon.
Arthur was seeking wisdom and direction, but instead he found ridicule by the Greek God of the Sea, who basically deemed him a joke. Undeterred, knowing that an Atlantean kingdom, Thule, (which was run by a coven of sea witches), was infecting his home, and spreading its reach across the seas and to the surface world, Arthur pleaded with Poseidon for help, and so the god bestowed his trident upon the fallen king.