Lo Lieh is perfect as the wickedly sleazy black magician, with his undead slaves, activated by a single long nail to the skull. This film (also known as BLACK MAGIC 2) has great wooden acting (excluding the aforementioned), elaborate gross-outs (see other comment), and plenty of genuine chills. It's also got a great soundtrack; a song in an early nightclub scene was sampled by the Beastie Boys for "Looking Down the Barrel of a Gun" on PAUL'S BOUTIQUE! Don't know if all the other Shaw brothers 70s productions are this good, but now I have to see them all!