The Wrath Of Vajra (2013)

In the 1930s , a Japanese cult called The Temple of Hades was ordered to cooperate with the Japanese military to destroy China. They buy so many young children from poor family , who will be trained as a lethal killing machine and serve the Empire of Japan. One of them is Vajra , who was forced by his captors to fight for the food , and accidentally causing the death of his brother. Several years later , Vajra grown up and become one of the biggest killer in the Hades sect. Vajra escapes to China and joins Shaolin , where he receives spiritual enlightenment and determined to support China against Japan.

Source: TMDb