The assembly known as the ‘Eight Medicine Buddhas’ shows the principal form of the Medicine Buddha, or the ‘Medicine Guru’ Bhaisajyaguru, surrounded by his ‘Six Brothers’ and Shakyamuni Buddha. Each of these eight Buddhas wear the three red monastic robes of a nirmanakaya monk, and sit in vajra-posture upon a moon disc and lotus, with only their specific body colours and right hand gestures differentiating them. The Medicine Buddha is also known as Vaiduryaprabharaja, the ‘King of blue-beryl or vaidurya light’, because of the bright blue rays that emanate from his body. These rays dispel the darkness of ignorance, desire, and aversion, which are the causes of imbalances in the three corresponding humors of phlegm, bile, and wind. He is deep blue in colour and holds a stem of the medicinal arura or myrobalan plant with his right hand, while his left hand rests upon his lap and supports an alms-bowl made from blue beryl (vaidurya) gemstone that contains three myrobalan fruits. The Medicine Guru is also recognized as an aspect that Shakyamuni Buddha assumed in order to reveal the medical tantras, and his meditational practices are performed to cure physical diseases, alleviate mental and emotional disorders, and eliminate the obstacles to health, happiness, longevity and harmony.