This ravening demon will rend you
To cavernous realms he will send you
You'll be burning in hell
Cause you haven't done well
But he'll have you well-done to amend you.
Night of the Demon aka Curse of the Demon (1957). Having learned under master of implication Val Lewton, director Jacques Tourneur didn't want to show the cheesy monster. But the film's producer insisted, and had his way. Subtlety good, producers bad.