Vedas Devil was an invincible Godking that rampaged across the Nine Worlds. He was the ruler of the Vedas Kingdom. He and his kingdom considered humans as mere ants and treated them as food, using their bones to build their palaces. 
Li Qiye reveal that the only reason he is still alive is because the Buddhist Lord guaranteed him that he had truly repented and would never kill again.
Before Li Qiye left Vedas kowtowed and thanked him for sparing his newborn great-great-grandson during his kingdom's destruction.