The Shadow Fox Spirits (黑狐妖 Heihu Yao) are the primary group of antagonists of the series. They have mysterious origins and are led by their Empress, the Shadow Fox Empress.
They steal spirit power form other spirits, preying like parasites on hapless couples and opposing the matchmaking efforts of the Tushan Fox Spirits. Their motto is "Do what you love to do" (with the implication of ignoring laws or morals if necessary to pursue those desires).