The Devī Māhātmya comprises chapters 81-93 of the Mārkandeya Purana. It is one of the early Sanskrit Puranas. It is a collection of stories narrated by Sage Markandeya to Jaimini and his students (in the form of birds). The 13 chapters of Devi Māhātmya are divided into three episodes or charitas – Prathama charitha, Madhyama charitha, and Uthama charitha.. Each episode begins by invoking a different presiding goddess, though the text does not mention them. Devi Mahatmya has 3 main characters in the framing narrative – a dispossessed king, a merchant who is betrayed by his family, and a sage whose teachings lead the two men beyond existential suffering. The sage recounts three major battles between the Devi and various demons. The three stories feature Mahakali (Chapter 1), Mahalakshmi (Chapters 2-4), and Mahasaraswati (Chapters 5-13). Madhyama Charitham or the middle part is the second episode which describes the killing of the buffalo-headed demon, Mahishasura, and his armies.
‘Om Namah Shivaya’ is a highly Sacred Mantra. It is dedicated to Shiva, the Supreme God of Dissolution, and salutes ‘the auspicious one.
Rudra is the fierce form of Shiva, who is kind-hearted and merciful.
This is an ancient Shiva Mantra of healing. It hails Shiva as the conqueror of death and the destroyer of problems