Vasishta was living with his son Sakthi and his wife Adhrisyanthi in his ashram. One day when he was away, King Kalmakshapadhar, a descendent of Ishwaku vamsa, who was on a hunting trip was passing by sage Vasishta's ashram. Sakthi came out and both the King and the sages's son waited for the other to respond out of ego and arrogance. The King annoyed by Sakthi's indifference lashed out at him with a whip. An enraged Sakthi, cursed the King to turn into a demon. Sage Viawamitra whose relationship with Vasishta was contentious at that time, released a demom called Kimkaran in the King's body. Kalmakshapadhar in a mood of revenge swallowed Sakthi and his ninetynine daughters.

When Vasishta returned to the ashram, he was apprised about the tragic incident. The sage grieving for his son, forgot the Dharma Sastras he had learnt and attempted suicide. But his soul did not part with the him and so he lived in the ashram with his Daughter-in-law Adhrisyanthi. One day he heard a voice chanting Veda mantras clearly and he was curious to know from where the sound was originating. Adhrisyanthi informed him that it was Sakthi's son growing in her womb, who was chanting the mantras. Vasishta felt alleviated to know that his vamsa had not been destroyed, shed his suicidal thoughts.

It so happened that Kalmakshapadhar at another time, swallowed Adhrisyanthi. Vasishta who reached the ashram on time, relieved the King of his curse and the latter got back his form. Adhrisyanthi in due course gave birth to a son, who became the famous Maharishi Parasarar. He had developed an apathy towards the Asuras who were responsible for his father's death and wanted to annihilate the whole Asura vamsa. So in order to fulfill his vow he performed a Yagna . Many Asuras fell into the Yagna fire and died. To mitigate his anger Vasishta counselled him thus- "My child, Do not harbour such ager in your heart. What harm did they do to you? Your father was destined to die because of his fate. Each one has to suffer for his deeds. The fame and the power you have attained from doing your Yagnas will be destroyed by your anger. So calm down and stop this Yagna". Thus Parasarar's fomented emotions were appeased by Vasishta and his anger was abated by the timely counsel from Vasishta.

Musukundhan, son of King Manthatha, who after his father's death was crowned as the king, fought a battle against Kubera once. Kubera sent an army of Asuras to defeat him. Musukundhan sought the help of Vasishta and the Sage with his power of penance helped Musukundhan to defeat the Asuras and become victorious in the battle.