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Vajra Yogini is also mentioned in our scriptures but not directly. She has to be decoded. Just like the whole world who think Vamana avatara of Lord Vishnu was a Brahmin. Vamana clearly was a person who was an ardent follower of Vama or the left hand path to god.
The Vamana avatara of Lord Vishnu had perfected a particular form of Vajra Yogini . Vamana was an ascetic who after deep penances of Lord Shiva perfected Vajra Yogini form, where she is portrayed as standing with one leg while the other leg is upwards towards the sky.
The scriptures explains that when King Bali, the king of Daityas became very powerful and he was unbeatable, it was Lord Vishnu who had pnce witnessed the form of ‘Vajra Yogini’, where her she was standing with one leg and the other towards the sky. Her two thighs were in opposite directions one towards the ground and another towards the sky and her vagina in the midst. He then witnessed the Devi body enlarge to such extent that it covered the whole universe. He was very startled and he performed penances of Lord Shiva to know more about ‘Vajra Yogini’. Lord Shiva then blessed him with the empowerment of Vajra Yogini and he descended on this earth to perfect it and also to serve the purpose of defeating King Bali.
After his perfection of Vajra Yogini, he had to serve a purpose of defeating King Bali and one fine day when King Bali organized a great spiritual gathering; he started to gift his guests with whatever they wished. When he asked Vamana to make a wish, Vamana asked him the land which his three steps would cover.
Maharishi Shukracharya knew about this whole act of Lord Vishnu and he did warn King Bali not to fulfill the wish and to take back the promise but King Bali refused because he had already asked. Maharishi Shukracharya then cursed him and left. King Bali then asked Vamana avatara to make three steps and Vamana avatara with the power of Vajra Yogini then makes the three steps.
His first step covers the earth and the second step heaven and all universe and there was nowhere for the Vamana to make his third step so Bali offers his head. The Vamana Avatara then places his foot on top of King Bali’s head after which King Bali relinquishes all his powers and holds, and submits them to Lord Vishnu and in the process defeating King Bali diplomatically.
Vajra Yogini is