later, when the asura rahu was decapitated by vishnu's mohini avatar, the demon's allies attacked her and all except kali were killed. having the power to possess the bodies of immortal and mortal beings, he entered the hearts of man and escaped . because kali was "invisible, unimaginable, and present in all" the only way to correct the chaos born from the miswritten texts was to completely renew the sacred scriptures entirely. thus vishnu descended to earth as vedavyasa, the compiler of the sacred scriptures vedas and the writer of the puranas.