'knowledge-causing mother-Buddha'[2]) is a female, peaceful to semi-wrathful Yidam in Tibetan Buddhism particularly associated with rites of magnetization[3] or enchantment.
[1] She is related to Shri Yantra in Hinduism, occupying the centre of the mystic diagram with varahi, together with whom the fifteen signs of moon phases (nityas) were born from.
According to Hindu astrology, Rahu is a snake with a demon head (Navagraha) who represents the ascending lunar node.
Her helper encountered a (dark-)red skinned enchantress in a market, who offered to do some magic.
The queen upon receiving the magic item, decided that it was inappropriate and harmful, and threw it to into a lake.
A naga dragon king from the lake ate the food and was enchanted to impregnate the queen while both burn intensively in "flames of desire".