Yangdak Heruka (Wyl. yang dag heruka) or Vishuddha (Skt. Viśuddhaheruka) is one of the eight deities of Kagyé, where he corresponds to Enlightened Mind. The wrathful manifestation of Vajrasattva, he is similar to the deity known as Chakrasamvara (Tib. Demchok), who is practised in the Gelug tradition. It is said that all the deities of the Mother Tantras are included in the practice of Yangdak.
The instructions related to Yangdak are based on the so-called "eight syllables of the rulu mantra".
- See Kongtrul (2005), pp. 322-323
- Jamgön Kongtrul Lodrö Tayé, The Treasury of Knowledge: Systems of Buddhist Tantra, Ithaca: Snow Lion, 2005