Black Chakrasamvara
As the sources tell, there exist around 50 different aspects in connection with Chakrasamvara. One is the black one – standing like an archer.
He is black and has four faces which are, beginning with the front [and continuing around counterclockwise], black, green, red, and yellow, each of which has three eyes. He has a tiger skin and 12 arms. A garland of 50 moist human heads hangs around his neck. He has a row of five skulls above his forehead, and a crest of black dreadlocks, topped by a left-oriented crescent moon and a double vajra.
The practice is secret and can only be performed by a transmission through a trusted teacher.