But as numerous tantric traditions have survived in South, East, and Central Asia, ethnographic research in these communities are a vital extra resource of information relating to them. However, the Pāñcar or truckātra sect, which dates back to your fifth or 6th century and centered on Viṣṇu qua Nārāyaṇa, https://www.youtube.com/watch?v=1bdBE_QGcvU