The Linga Purana lists twenty-eight avatars of Shiva. In the Shiva Purana there is a distinctly Saivite version of a traditional avatar myth: Shiva brings forth Virabhadra, one of his terrifying forms, in order to calm Narasimha, an avatar of Vishnu. When that fails, Shiva manifests as the human-lion-bird Sharabha which calms down lion-man Narasimha avatar of Vishnu, and Shiva then gives Vishnu a chakra( not to be confused with Sudarshan Chakra )as gift. A similar story is told in the late medieval era Sharabha Upanishad. However, Vaishnava Dvaita school refutes this Shaivite view of Narasimha.