The 'blank faced' due to their black 'Tilak' (mark on forehead). Worshippers of 'Bhairav' (the fierce form of Shiva) and known as 'Mahavarati' (one who carries out extreme penance. This refers to the 12 year vow taken following the sacrifice of a Brahmin (priest), imitating the tale of Bhairav when he cut off the head of Brahma (the creator). Kalamukhas, like Kapalikas, are derived from the 'Pashupati' ('master of animals') order and are known for being ferocious fighters and often carrying out human sacrifices/cannibalism (victims hailing from the Brahmin (priest) caste) and self-mutilation.

Also see 'Aghori', 'Bhairav', 'Mahakal', 'Kapalika', 'Pashupati', 'Rudra', 'Shiva'.