Goddess of Chinese myth and Daoism who taught the 黄帝 (Yellow Emperor) the art of war to defeat 蚩尤. In 水浒传 she appears to 宋江 in a dream and gives him books of heavenly strategy.
In Water Margin, Xuannü bestows the Heavenly Book on Song Jiang.
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In her name, 九天 'the Nine Heavens' are the highest reaches of the sky in Chinese cosmology, and 玄 carries the Daoist sense of 'dark, mysterious, profound'. She first appears in texts of the Han dynasty.
In Chapter 42 of the Ming-dynasty novel, Xuannü appears to outlaw-hero Song Jiang in a dream and gives him three scrolls of celestial military strategy - a key turning point in the bandits' rise to power.