Cundī dhāraṇī or mantra also to start with appeared within the Kāraṇḍavyūhasūtra: namaḥ saptānāṃ samyaksaṃbuddha koṭīnāṃ tadyathā oṃ cale cule cunde svāhā For Conze, the final section of the event of Buddhist mantras would be the tantric phase of Mantrayana. On this tantric period, mantras are on the very center https://www.instagram.com/tantramantraaurvigyaan/