Harivahana

Arjuna sets out on the divine chariot that Indra once used to vanquish the greatest asuras. The roar of his departure alerts the gods, who assemble and ask what he intends to do. He tells them his mission, receives their blessings, and accepts the conch shell Devadatta — the very one Indra used to conquer the worlds.

Harivahana — Indra himself — tells Arjuna that the time has come to pay his preceptor's fee. But before revealing the task, he makes Arjuna promise to do it. Arjuna agrees, and learns what the king of the gods requires: the destruction of thirty million nivatakavachas, the invincible danavas who live along the ocean shore.