Bardo Thodol
A prominent sadhana, or practice text, is part of a group of bardo teachings which are held in the Nyingma tradition to have originated with Padmasambhava in the 8th century and were rediscovered as terma, or 'treasure teachings' in the 14th Century by the tertön Karma Lingpa. The Zhitro mandala teachings were found in the same terma collection as the "Bardo Thodol", a text well known in the West as "The Tibetan Book of the Dead".