This is the story about that time when there was a battle of Mahabharat going on between the Pandavas and Kauravas. That time Bhim’s son Ghatotkach and Nag Kanya’s daughter’s son Barbareek had asked his mother for permission to participate in this battle.
Barbareek’s mother allowed him to fight in the battle on one condition that he would help the weak side. Barbareek agreed and left for the battle. That time he had only three arrows with him, which he had received from Lord Shiva in the form of Vardan. With these three arrows he could win the three worlds.