Kaalabhairava Ashtakam is a gorgeous Sanskrit hymn, composed by Adi Shankara. It comprises 8 stanzas; that happen to be standard of any Ashtakam. The hymn depicts the attributes of Kaala Bhairava of Kashi, the God of Loss of life. This Bhairava is described as staying black; with out outfits; https://www.youtube.com/watch?v=S2iLMNuDYc0