The Leviathans, also known as the Sea Monsters, are the titular main antagonists of the manhwa Leviathan.
Behavior[]
The majority of Leviathans don't seem to have any kind of sentience and act as simple minded predators whose only focus is to find and devour food. They also almost never show any kind of intelligence, always favoring using raw power to destroy their enemies. There are however exceptions to this, the "Seven Devils of the Sea" have above average intelligence compared to other Leviathans and the ability to learn from their surroundings so they can use it to their advantage.
Some of them also are capable of showing emotions.
Physiology[]
The appearance of the Leviathans differs from each individual creature, but a main symptom is their large size, from a few meters in length to the size of a three-story house. Another sign is their overly large mouth with an array of sharp (in a few instances), or entirely flat teeth (which is more common). Despite their large sizes there isn't any problem with maneuverability, the ability to quickly move around even out of water is a commonly seen observation.
Leviathans seem to be capable of feeling pain, often reacting to stabs and cuts with loud screeching sounds.
Story[]
130 years ago, a meteor hit the Moon, causing its debris to crash into Earth. The largest piece of debris fell into the Pacific Ocean, creating a large crater called Vagabundus. Research ships from all over the world came to inspect the crater, but then there was a sudden explosion emanating from the crater and all the ships were lost.
This explosion caused numerous seeds to swiftly cover the globe, and those seeds would infect and change the world's sea creatures into vicious monsters. The moon's partial destruction caused the Earth's sea level to rise and marine life are now the dominant life on earth as the mutated sea creatures became apex predators. Inside the crater would the Queen of the Leviathans thrive and command her newly turned army to do what she wants.