His mother had obtained this mace as a result of her offering but the condition attached to the boon operated and it came back and struck Srutayudha himself dead. This is the story of the mace.

Parnasa went through penances which pleased Varuna and obtained from that god a boon that her son Srutayudha may not be killed by any enemy.

"I shall give your son a divine weapon. Let him use it n all his battles. No enemy will be a6le to defeat him or kill him. But he should not use the weapon against one who does not fight.

If he does, the weapon will recoil and kill him. Saying this, god Varuna gave a mace. Srutayudha,when fighting Arjuna,disregard- ing the injunction, hurled the mace at Krishna who was not fighting but was only driving Arjuna's chariot.