Has to be the Black Madonna. The entire concept just makes sense on a number of levels, and doesn't feel like the macguffin is something forced or an artificial deus ex machina. I also like that it veers away from the 'last' trope - last working computer, last submarine, etc etc. For sure the Black Madonna is unique, but for very different reasons.
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Author of the unofficial and strictly non canon Alternative Survivor’s Guide to the United Kingdom
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