Cundī dhāraṇī or mantra also 1st appeared in the Kāraṇḍavyūhasūtra: namaḥ saptānāṃ samyaksaṃbuddha koṭīnāṃ tadyathā oṃ cale cule cunde svāhā For Conze, the final period of the development of Buddhist mantras is the tantric period of Mantrayana. On this tantric phase, mantras are within the really Middle of The trail https://www.youtube.com/@Mahavidyabaglamukhi/