Filipe Furtado’s review published on Letterboxd:
Damnation and the erosion of reality, both will arrive slowly and take you over. Bava most labored film, every image careful thought and cultivated with so much care actors appear to move in slow motion even in face of jump scares. This might be the first movie that was really thought as a star vehicle for its filmmaker, forget host Karloff, Black Sabbath is all about allowing Bava to flex his muscles on different registers of the fear film. No wonder the Italian cut (avoid the AIP one at all costs, the wurdlak will visit you otherwise) ends with the rather abstract The Drop of Water. The variety of the tales are an essential part. The sum of the three stories is larger and more effective than their individual qualities.