Karma Vipak means the fruits one reaps according to his or her Karma. While continuing with the description of various aspects of hell, Nachiketa told the assembled sages–At Yamapuri, Chitragupta goes through the record of all the deeds, committed by a man when he was alive and brings into the notice of Yamaraj.
Yamaraj then decides upon the punishment to be given to the concerned soul. The punishment can be varied like if the soul was virtuous then it would be sent to heaven, or the soul may even be made to take birth as a tree, or an animal or any other creature. Sinners like those who had remained disinclined towards any kind of virtuous deed, or those who had abandoned their faithful wives, were sent to the hell named Raurav. The souls of virtuous people were sent to the heaven. Those who had extreme attachment to women took rebirth as human beings. People who had attained martyrdom while fighting a battle were sent to Indrapuri. Those who had engaged themselves in virtuous deeds throughout their lives were rewarded for their good deeds.”