Avataars of Lord Shiva
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A disagreement broke between Arjuna and Kirat (Shivas avatar) over who killed the boar. Arjuna challenged Shiva for a dual. Shiva was very much impressed by his valour. He revealed his real identity. Arjuna was very ashamed that he fought with Shiva but Lord Shiva consoled him and gave his weapon Pashupat to Arjuna.