Sea snake

Sea snakes, also known as sea serpents, were an aquatic species of viper that sometimes grew so large as to be considered a type of giant snake.

Behavior
Sea snakes largely ignored other creatures, attacking only when they were hungry or disturbed. Like any snake they feared fire and would retreat from open flames. They had a basic level of intelligence typical of animals.

Biology
These creatures had a poisonous bite. When underwater a membrane on their snouts sealed their nostrils, allowing them to dive to great depths.

Combat
Sea snakes were one of the few species of snake to both have a poisonous bite and attack by means of constriction. Smaller varieties of them would simply inject their venom and then withdraw, waiting for it to take effect. While the largest of sea snakes were capable of coiling about small vessels and gradually crushing them through constriction.

Ecology
Like most snakes, these creatures lived solitary lives. However, on rare occasions there were instances of them gathering in large masses of hundreds or even thousands, often wide and  long. The reason for this was unknown. Some speculated that it may have been due to seasonal migrations, others that it might have been a mating ritual.

Diet
Like nearly all species of snake, these creatures were a carnivorous species.

Habitats
Giant sea snakes were found only in the seas and oceans of tropical regions. Smaller varieties of this creature could be found in shallow waters.

They inhabited the Sea of Fallen Stars and the Yellow Sea. They could also be found near Waterdeep.

Relationships
Some sea snakes acted as servants of the marid Kalbari al-Durrat al-Amwaj ibn Jari in her Citadel of Ten Thousand Pearls.

Some aquatic spirit shamans had sea snakes as animal companions.

Usages
Bandoliers, belts, and harnesses made from the treated skin of sea snakes was common among all the sentient creatures of Serôs. Their scales were also a required material component for the spell oars to snakes.

The bodies of these creatures were edible and considered delicacies by certain races. One establishment known to serve fried sea snake was the Fiery Flagon in Waterdeep.

Notable Sea Snakes

 * Shipwrecker, a sea snake that was owned by the sha'ir Khadiga.

Trivia

 * Some of the pillars in The Singing Siren had sea serpent shapes carved into them.