
Arunasura was a demon who had attained the boon from Lord Brahma of not getting killed by any two- or four-legged creatures. Arunasura was killed by Goddess Parvati in the form of Bhramari Devi. So it was told that in the city of the demons, there lived a powerful demon named Arunasura. He was a furious God-hater and a hypocrite, who wanted above all else to conquer the Gods. He went to the banks of the Ganges in the Himalayas and practiced a very strict penance to Brahma, who believed him to be the protector of the demons. He held in his body the five vāyus of Prana and began meditating, repeating the Gayatri Mantra and practicing austerities. For the first ten thousand years, he lived by ingesting only dry leaves; for the second, he lived by drinking only drops of water; and, for the third, he lived by inhaling air alone. For the fourth ten thousand years, he did not consume anything and thus practiced his penance.