The Beasts (1980)

When Dr. Yuen attempts to rescue a girl about to be sacrificed by the Worm Tribe in the middle of a jungle in Thailand, he is damned with seven deadly "blood curses" and must return there to find a permanent cure.

A young schoolgirl, Yuen Fong becomes caught in a tragic stranglehold of triad activity after she testifies in court over a triad beating. When this news reaches the triad leader Brother Smart, Yuen Fong must pay him protection money for what she has done as events begin to escalate.

After a couple purchases an antique vase at a market, the woman is possessed and killed by a demonic creature. Twelve years later, the demon returns to possess the woman's nephew and wreak more havoc.