The custom of such guhya or secretive Bhairava is definitely an oral tradition that is constant inside the guru disciple tradition. Their karmakand rituals and techniques are key, they aren't created down but only learnt and practiced in guru disciple tradition. During the Kala Bhairav Ashtakam by Adi Shankracharya, Kala https://felixpahns.azzablog.com/29988968/bhairav-an-overview