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Yamāntaka (Sanskrit: यमान्तक Yamāntaka) or Vajrabhairava (Tibetan: གཤིན་རྗེ་གཤེད་, རྡོ་རྗེ་འཇིགས་བྱེད།, Wylie: gshin rje gshed; rdo rje 'jigs byed; simplified Chinese: 大威德金刚; traditional Chinese: 大威德金剛; pinyin: Dà Wēidé Jīngāng; Korean: 대위덕명왕 Daewideok-myeongwang; Japanese: 大威徳明王 Daiitoku-myōō; Mongolian: Эрлэгийн Жаргагчи Erlig-jin Jarghagchi) is the "destroyer of death" deity of Vajrayana Buddhism. Sometimes he is conceptualized as "conqueror of the lord of death". Of the several deities in the Buddhist pantheon named 'Yamāntaka', the most well known, also called as 'Vajrabhairava' belongs to the Anuttarayoga Tantra class of deities popular within the Gelug school of Tibetan Buddhism.
Yamāntaka is a Sanskrit name that can be broken down into two primary elements: Yama (यमा), –the god of death; and antaka (अन्तक) –destroyer. Thus, Yamāntaka means “Destroyer of Death” or "Conqueror of Death". One historic source of name follows Kalantaka, an aspect of the Hindu god Shiva who saves his follower from the clutches of death Yama and is seen as the deity of adherence and origin of the Mahamrityunjaya Mantra of Buddhism and Hinduism.
While Yamāntaka is therefore Yama's nemesis, his representation mirrors Yama in many ways: He too often rides a buffalo and often depicted with a buffalo's head.
Because of this mirroring of appearance and similarity in name, it is not hard to find texts and books (which would appear to be reliable sources of much material) conflate both Yamāntaka and Yama as being the same deity when they are not.
Within Buddhism, "terminating death" is a quality of all buddhas as they have stopped the cycle of rebirth, samsara. So Yamāntaka represents the goal of the Mahayana practitioner's journey to enlightenment, or the journey itself: On final awakening, one manifests Yamāntaka – the ending of death.
Yamāntaka is a wrathful expression of Mañjuśrī, the Samyaksambuddha of wisdom who, in other contexts, also functions as a dharmapala or a Heruka. Yamāntaka manifests in several different forms, one of which  has six legs, six faces and six arms holding various weapons while sitting or standing on a water buffalo. The topmost face is the wrathful aspect of Mañjuśrī, with a red face below it. The other faces are yellow, dark blue, red, black, white, grey, and brown. Each face has three eyes. Common representations also depict thirty-two hands and sixteen legs. 
Yamantaka in Japanese Buddhism
In Japanese esoteric teachings, Dai Itoku-Myoo is the wrathful emanation of Amida and is pictured with six faces, legs and arms holding various weapons while sitting on a white ox.
- Kalantaka (Sanskrit: ender of death and time) is an aspect of the Hindu god Shiva as the Conqueror of Time and Death, itself personified by the god Yama.
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