The Ninth Sea was the former sea of the Ninth Mountain and Sea. Sometime before the war with the 33 Heavens the Ninth Sea gained self-awareness; it being the first of the Nine Seas to have done so. Meng Hao vowed to exterminate the Ninth Sea after it attempted to obstruct his path and tried to save his enemy.
History[]
Later, during the war with the 33 Heavens the Ninth Sea chose to turn traitor and join the 33 Heavens, as it didn't want to go down with the Mountain and Sea Realm. [1]
When Meng Hao brought his army to destroy the 33 Heavens, Ninth Sea was revealed to have been hiding in the guise of the 8th Heaven. It was then cornered by Grandpa Meng, Paragon Puppet Eegoo, Ke Jiusi and Ksitigarbha when it attempted to flee. As Meng Hao laid his gaze on it, the Ninth Sea attempted to blame Meng Hao as the cause of its treason; however, Meng Hao caught its lie and without another word threw it into the burning hell where its soul would burn for all of eternity, alongside the Outsiders from the 33 Heavens.