Sage Shakti's curse
One day Sage Shakti, Sage Vashishtha's son, was going through a forest.
Suddenly, King Kalmashapada's chariot blocked his path. In those days, it was customary for everybody to give way to a sage, a blind man, a crippled person or an old woman. But King Kalmashapada was vain and did not give way to Sage Shakti. Instead King Kalmashapada rudely ordered him, "Move to a side and make way for the chariot. Don't you see that I am the king of this region?" Sage Shakti tried to explain, "I am a sage." But King Kalmashpada was very proud and refused to move. Instead, he lashed at the sage with a whip. At this, Sage Shakti got angry and cursed the king to become the king to become a demon.
Sage Viswamitra, who was passing by, saw this incident. He was a big enemy of Sage Shakti's father, Sage Vashishtha and heard Sage Shakti cursing the king. He asked another demon, Kinkara, to enter King Kalmashapada's body. When the demon entered his body, King Kalmashapada became evil and lost his sense of righteousness. He thought that his behavior had changed because of the curse of Sage Shakti, so he went to Sage Shakti and said , "Your curse has made me a demon. Since you are responsible for this. I will take revenge on you and will eat you up." Saying this, King Kalmashapada roared and killed Sage Shakti and ate him. Later, he even killed Sage Shakti's brothers.