Period piece set during the Inquisition about a witch-finder general who falls in love with the village beauty, who has made a pact with the devil to seduce and condemn the man who is killing off Satan's servants.
Practical Effects
Grimy Inquisition sets that reek of 1970s Spain.
Costume
Satan's cape game is unhinged.

Director
Paul Naschy
Trivia, insights & behind the scenes
Paul Naschy wrote, directed, and starred in this while recovering from a near-fatal heart attack—method commitment to Satanism, apparently.
Part of Spain's late-Franco horror boom, when filmmakers exploited loosening censorship with religious-themed exploitation that would've been impossible a decade earlier.