The ugra aspect of the devi is best characterised by her Mahishasuramardini image, which has been depicted in various ways over the centuries. The Vedic text such as Vajasaneyi Samhita, Taittiriya Aryanaka, Kena, Mundaka Upanishads, Sankhayana grihasutras mention Durga in her various forms; the soumaya (quiet/placid) forms among them being that of Gauri, Parvati, etc….