Vidyadhara is the word in Buddhist literature for a person having the great knowledge (vidya) of mantras and other esoteric knowledge of occult practices such as recitation of spells, samatha, and alchemy. A realized master on one of the four stages on the tantric path of Mahayoga. Another Buddhist definition is: Bearer of the profound method, the knowledge which is the wisdom of deity, mantra and great bliss.
The Buddhist Tantras are a varied group of Indian and Tibetan texts which outline unique views and practices of the Buddhist tantra religious systems.
Buddhist Tantric texts began appearing in the Gupta Empire period though there are texts with elements associated with Tantra that can be seen as early as the third century.
By the eighth century, Tantra was a dominant force in North India and the number of texts increased with numerous Tantric pandits writing .
Vajrayāna along with Mantrayāna, Guhyamantrayāna, Tantrayāna, Secret Mantra, Tantric Buddhism, and Esoteric Buddhism are names referring to Buddhist traditions associated with Tantra and "Secret Mantra".
Practitioners of Vajrayāna need to abide by various tantric vows or pledges called samaya.
These are extensions of the rules of the Prātimokṣa and Bodhisattva vows for the lower levels of tantra, and are taken during initiations into the empowerment for a particular Unsurpassed Yoga Tantra.
The special tantric vows .