I only remember a little about the movie. There's one scene where a woman in thigh high boots is chanting some sort of spell. I think it's affecting a male dwarf actor. He started out as one of the good guys, but the spell makes him a slave or something. He tries to kill someone, but ends up falling on a wrought iron fence and dies. Setting is, I think in Europe, not medieval times.
Pretty sure it's in English. Probably '80s to early '90s.