What is Hu Tianhei good at?

Cure deficiency diseases and evil diseases. In the novel Hu Tianhei, Hu Tianhei is named Tianhei by his mother because he is a black fox and is of the same generation as Tianhei. As a fairy, his main ability is to be good at helping people cure diseases. The ability of evil diseases to help others avoid suffering through the magic of their own fairy family.