Oceana Kingdom's forbidden area, or also known as the Black Abyss. As the name suggests, in the area that was put up with a barrier to separate the Oceana kingdom from the area, there was endless darkness within. Triton, with the power that comes from the trident, creates a wall that separates the Oceana kingdom from the monsters living in the forbidden area.
The monsters in the ocean couldn't break through the wall created by Triton. The inhabitants of the Black Abyss were furious because their activities were limited by the presence of a wall that prevented them from going anywhere apart from the part behind the wall.
