Ch. 557
Dashagriva, the ten-headed king of the rakshasas, is rampaging through the three worlds, protected by a boon that makes him invincible to gods and asuras. The gods, led by Agni, flee to Brahma for refuge — and learn that the solution has already been set in motion. Vishnu has already descended to earth, and the gods themselves must take birth among monkeys and bears to serve as his army.