Eighteen Inner Tantras of Secret Mantra
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Eighteen Inner Tantras of Secret Mantra (gsang sngags nang gi rgyud sde bco brgyad). In the context of Chapter 12, the term refers chiefly to the tantras of Mahayoga. They were translated into Tibetan by Padmasambhava and Chokro Lui Gyaltsen. See also; Eighteen Mahayoga Tantras.