Mahakala
Mahakala (Skt. mahākāla; Tib. མགོན་པོ་, ནག་པོ་ཆེན་པོ་, Wyl. nag po chen po, but usually mgon po) - a supermundane dharma protector who appears in a number of forms, such as Four-arm Mahakala, Six-arm Mahakala, Bernakchen, Gönpo Maning and Pañjaranatha (Gurgyi Gönpo).