What does "wild power" mean? What is the stem of "wild power"

In the novel Hua, the power of the wild is the power of the demon god. Hua collected ten artifacts to release the wild power, and the demon god instilled his power into Hua. Although Bai sealed the power of the universe in China. However, because of the death of Yu Qinghe in the east, the betrayal of light water and the death of the most important sweet baby, Hua was desperate, released the power of the wild and became a demon god.

On August 8, 20 16, in the women's 100 meter backstroke semi-final of the Rio Olympic Games, China's Fu said in an interview, "I used the power of the wild", which quickly became popular on the Internet. The power that can't control the wildness in the body has also become a common language for netizens to ridicule.