This form of Shiva, described by Adi Shankaracharya in the Kalabhairava Ashtakam, is shown to be naked, black, entwined with a garland of skulls, three eyes, weapons of destruction in his four hands, and entwined with snakes. But, one of the most fearsome avatars of Lord Shiva is the Kalabhairava. Although his original ascetic form is widely revered, his Pashupatinath and Vishwanath avatar are also quite famous. Lord Shiva has several forms and avatars (manifestation of a deity in physical body form).
