The custom of such guhya or secretive Bhairava is an oral tradition that is continuing inside the guru disciple tradition. Their karmakand rituals and techniques are top secret, they don't seem to be published down but only learnt and practiced in Expert disciple custom. The Rigveda described Rudra since the https://directorylandia.com/listings578857/the-2-minute-rule-for-kaal-bhairav