The custom of these guhya or secretive Bhairava is an oral tradition that is constant during the Expert disciple custom. Their karmakand rituals and practices are magic formula, they are not composed down but only learnt and practiced in Expert disciple custom. From the Kala Bhairav Ashtakam by Adi Shankracharya, https://free-kundli59123.liberty-blog.com/29967666/5-simple-techniques-for-bhairav