A sword. Once कुबेर cursed a यक्ष and making him a lion posted it to guard the palacegates of महाबलि . He said he would be released from the curse when any man on earth defeated it. Once a brahmin warrior named श्रीदत्त defeated this lion and at once the lion changed into a यक्ष and the यक्ष presented श्रीदत्त with the sword named मृगाङ्कक . (Kathāpīṭhalambaka, Kathāsaritsāgara)