"Bastard Swordsman" a.k.a. (Tian can bian) (1983)

Bastard Swordsman, also known as 天蚕变, 天蠶变, Tian Can Bian, 天蠶變功夫 and Reincarnate Swordsman, is a 1983 Hong Kong wuxia film produced by the Shaw Brothers Studio. (Synopsis): Every 10 years, the Wu Dang and Invincible Clan chiefs have a duel, and the past two times the Invincible  Clan has won. The WuDang chief has been training hard for 10 years, but still isn't sure his skills are strong enough to win. His own master has retired for 20 years to study the silkworm Teniques. Wu Dang's greatest kung fu, but has been unable to reach the final stage. Norman Chu plays the Bastard Swordsman, a servant at Wu Dang clan who is picked on and bullied by the students and given rough justice by the masters. Everyone calls him bastard because he doesn't know who his parents were, and nobody will teach him kung fu...excepot a mysterious masked stranger who appears at night and secretly passes on some amazing skills. Hsu Shao-chiang stars as a veritable "Spider-Swordsman" - master of the "Silkworm Style