In the legend of the churning of the milk ocean, Vasuki allowed the Devas and Asuras to bind him to Mount Mandar to use him to churn the Amrita, the nectar of immortality. This happens after the devas and the asuras agree to join forces in order to gain the Amrita. It is also said that Indra tricked the asuras into holding Vasuki by its heads, so that they could inhale its hot breath. However, as the milk ocean was churned up, a poison seeped out which threatened the world. So Shiva swallowed the venom as an act of self-sacrifice to prevent premature destruction of the world, thus earning him the title of Nilakantha ("blue throat"). He has a sister called Manasa, who is a goddess of snakes and poison.
Vasuki is also recorded in Buddhist mythology, as well as the mythology of China and Japan, as one of the "Eight Great Naga Kings" (known in Japan as the Hachi Ryuu-Ou). In Buddhist mythology, he, along with the other Naga kings, appear in the audience of many of the Buddha's sermons.
Vasuki acts as one of the two chaos field bosses tied to the Invoke system and will appear in Ueno once every hour during weeks when the chaos alignment dominates the system. After obtaining the poison snake hand he drops, he can be fused by a special double-fusion of Raja Naga and Garuda.
Vasuki appears as the first boss of the Karma Temple, and is fought in the Temple's Sea of Milk after the Embryon is kicked to the very bottom of the tower by Sera to prevent them from following her. He acts as a guardian, intended to deter intruders from ascending the Temple. Vasuki fights mainly by exploiting weaknesses and Critical Hits with his unique spell Hima Alaya (an Ice-type spell which deals heavy damage and high chance of inflicting Freeze), Maziodyne and Megidola.
"A giant serpent of Hindu lore. It is said that gods and demons used him to churn the sea of milk to create Amrita. They used Mt. Mandara as the stick and Vasuka as the rope to pull it. The strain caused him to exhale incredibly poisonous venom, but Shiva safely swallowed it."
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