The tradition of these guhya or secretive Bhairava can be an oral tradition that is constant in the Expert disciple tradition. Their karmakand rituals and practices are key, they aren't penned down but only learnt and practiced in Expert disciple custom. Kāla Bhairavaācāra is a karmakaand manuscript which includes yantra https://rivermnnkj.blogdosaga.com/29781310/examine-this-report-on-bhairav