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Once, Arjuna was performing a tremendous penance to please lord Shiva. Duryodhan had sent a demon named Mooka to kill Arjuna. Mooka had disguised himself as a boar. Arjuna was engrossed in his meditation, when suddenly his concentration got disturbed by a loud noise. He opened his eyes and saw Mooka being chased by a Kirat. In fact it was none other than Shiva who had appeared in the guise of Kirat. Both Arjuna and Lord Shiva struck the boar with their respective arrows at the same time.