The Keep
1983
Set during World War II, a German army garrison is sent to guard a mountain pass in a village in Romania's Carpathian mountains and sets up barracks in an ancient stone fortress. Two of the soldiers unwittingly release a mysterious entity that kills or corrupts those within its influence, drawing the attention of a Gestapo commander, a Jewish scholar, and a mysterious traveller.
Genres:
My notes
This might be the most perfect prestige B movie. A shockingly stacked cast, surprisingly good effects for 1983, and a film where a demonic force is killing Nazis. It does try and make some of the nazis sympathetic - which is awkward and bad - but it does so when asking the question "is the enemy of my enemy my friend?" with a resounding "No."