Watch The Hidden Power of the Dragon Sabre (1984) Online

The story concerns the efforts of the emperor to obtain the Dragon Sabre and it's companion magic sword so the "martial world" will be forced to respect him. He enlists a bad guy who plots a massacre of the Mongolians to blamed on the "Ming cult" so that the Mongolian hero played by Ti Lung will attack and steal the sabre from the cult and then give it to the bad guy who has in the meantime stolen a powerful magic sutra from Budhhist nuns, kidnapped a Mongolian Princess and is trying to become a Yin/Yang fighter which looks like ... wait, none of this makes much sense, but that's the film. Derek Yee plays the hero of the Ming cult who is trying to find out who is framing the cult for the massacre.