Black Manta wields a black trident in Aquaman and the Lost Kingdom, a pwoerful DCEU weapon with a complicated comics backstory. Black Manta is well-known as one of Aquaman's arch-enemies in the comics, a sea-faring mercenary wearing a high-tech suit to battle the King of Atlantis. 2018's Aquaman saw David Kane, a.k.a. Black Manta (Yahya Abdul-Mateen II), make his cinematic debut, with David holding Arthur Curry (Jason Momoa) responsible for his father's death and seeking revenge – a premise that leads him to enact further retribution in the final movie of the DCEU timeline.
https://screenrant.com/aquaman-and-the-lost-kingdom-black-trident-comics-origin-powers-explained/