Nivatakavachas (Sanskrit: निवतकवच) are a celestial race of Asura demons, living deep under the oceans in Hindu mythology.
Their name is Sanskrit for of practical application - layer - garment or similar.
Nivatakavachas are extremely powerful in magic, mysticism and warfare. They have powerful weapons and perpetrate evil in nature, but they also are glorious and legendary beings. The Devas under Indra cannot overcome them despite repeated battles.
According to the Mahabharata they were 30,000,000 in number, and dwelt in the depths of the sea
In the Ramayana, they strike an alliance with Ravana after Ravana is unable to defeat them. They are finally vanquished and destroyed entirely by Arjuna, the hero of the epic Mahabharata.