The origin of the Thunder Beast in the Legend of Mortal Cultivation was not clearly explained in the novel. In the novel, the Thunder Beast was a grade-9 magical beast that lived in the Thunder Continent. It had the lightning attribute, was extremely fast, and was extremely powerful. The Thunder Beast cub would be born with a Thunder Pearl. This Thunder Pearl was the Thunder Beast's inner core, which could increase a cultivator's cultivation and strength. In the novel, Han Li had obtained a lightning pearl on the Thunder Continent and gifted it to his disciple, Li Feiyu. After Li Feiyu used the Thunder Pearl, his cultivation base had been greatly improved, and he had become a powerful cultivator. While waiting for the TV series, he could also click on the link below to read the classic original work of " The Legend of Mortal Cultivation "!