Once, Vritrasur, a powerful demon, wanted to conquer heaven. He fought with the gods and swallowed all their weapons. The gods went to Vishnu said, "Due to long penance, the bones of Dhadichi, the sage, have become very strong. Only the weapon made of his bones can kill Vritasur. But you can't kill Dadhichi, as he is my devotee. You will have to ask him to die to give his bones. "The gods, led by Indra, went to Dhadichi and begged for his bones. Dadhichi was ready to sacrifice his, but he wanted to go on a pilgrimage before that. Hearing this, Indra brought all the holy places near him. After taking dips in the holy waters, Dhadichi gave up his life. Indra made a weapon called Vajra with his bones and killed Vritrasur.