The origins of Kaal Bhairav trace back again to historic Hindu legends where by he was created by Shiva in the course of a war amongst gods and demons, showcasing his job to be a destroyer of evil.  भक्तवत्सलं स्थितं समस्तलोकविग्रहम् । Guru and ācārya informs which mantra to use https://zeedirectory.com/listings13054726/5-simple-statements-about-kaal-bhairav-explained