Cundī dhāraṇī or mantra also to start with appeared inside the Kāraṇḍavyūhasūtra: namaḥ saptānāṃ samyaksaṃbuddha koṭīnāṃ tadyathā oṃ cale cule cunde svāhā For Conze, the final stage of the event of Buddhist mantras is definitely the tantric stage of Mantrayana. Within this tantric period, mantras are within the pretty Centre https://www.youtube.com/@AacharyaGoldieMadan/