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Buddhism: Tantric Buddhism
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A third broad tradition, variously called Vajrayana (Diamond Vehicle), Mantrayana (Vehicle of the Mantra), or Tantric Buddhism, offers a quicker, more demanding way to achieve nirvana. Because of its level of challenge—enabling one to reach enlightenment in one lifetime—it requires the guidance of a spiritual leader. It is most prominent in Tibet and Mongolia.
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When Buddhism began interacting with the Indian Tantric tradition an entirely new form of practice emerged. Once again the Vajrayana as it is mostly called these days, re-emphasised the basic principles of Buddhism, but it was most deeply concerned with direct experience of reality. Also called mantrayana.
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Tantric Buddhism, which is sometimes separated from the Mahayana as a distinct "Thunderbolt - Vehicle" (Vajrayana), became especially important in Tibet, where it was introduced starting in the 7th century. It was... the last phase of Buddhism in India, where the religion - partly by reabsorption into the Hindu tradition, partly by persecution by the Muslim invaders - ceased to exist by the 13th century.
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Tantric Buddhism