The Hidden Power of the Dragon Sabre

The Hidden Power of the Dragon Sabre is a 1984 Hong Kong wuxia film directed by Chor Yuen and produced by the Shaw Brothers Studio. The film is a spinoff of Louis Chas novel The Heaven Sword and Dragon Saber.

Song Qingshu, a defeated villain from the original story, returns and starts a reign of terror. He traps a beautiful Mongol princess and masters a new Yin and Yangcombined martial arts technique, becoming almost invincible. Zhang Wuji has to put an end to Song Qingshus rampage.

Source: Wikipedia