In the climax of the film, Aquaman confronts his half-brother, Orm/Ocean Master (played by Patrick Wilson), who is attempting to unite the underwater kingdoms to wage war on the surface world. The battle takes place in the underwater city of Atlantis.
During the intense fight, Arthur Curry embraces his destiny as the true heir to the throne of Atlantis and the wielder of the trident. Mera (played by Amber Heard), who has been aiding Aquaman throughout the film, also plays a crucial role in the battle.
One of the significant moments is when Aquaman discovers that he can communicate with sea creatures, commanding a massive army of marine life to join the battle against Orm’s forces. This revelation helps turn the tide of the conflict in Aquaman’s favor.
In the end, Aquaman defeats Orm in single combat and claims the throne as the rightful king of Atlantis. Orm is ultimately defeated but not killed, leaving room for potential future conflicts.
The movie concludes with Arthur Curry taking his place as the King of Atlantis and making strides toward uniting the underwater and surface worlds. The film sets up Aquaman as a hero who can bridge the gap between the two realms and serve as a protector of both.