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I have very tenuous memories of this movie, watched on VHS in the mid-eighties. The hero, a young man, had to rescue a young woman (princess?) from a massive number of obsidian, or at least shiny black, robots or golems or something. Something significant about their hearts, maybe hearts were transplanted from living creatures into the robots? The cover depicted a bunch of the robots in a wedge advancing across a featureless plain, the lead robot holding the woman in its arms. The hero and his friends (mutants/aliens/monsters?) are standing on a cliff ledge overlooking the robots.