The oath of Vayuputras is the last and the third book of Shiv trilogy written by Amish Tripathi. Around 5000 years ago, Shiva was a normal human being and later with of his good deeds and believes, he became god. One fine day, Panchvati with Shiva comes to know Somras and the process of manufacturing to understand plague disease. There, he comes to know that a large amount of water to manufacture Somras which needs to be taken from river Saraswati and this is the reason for the depletion of Saraswati water.