I think that story is a great example of how folk stories, in that case a kid folk story, encode actual information: the original detailed information is boiled off and jumbled up with generic archetypes. In that story case, a historical event, was replaced with a generic "secret tunnel" narrative. The historical event was a town official hid court records in Rocky Cellar during the war of 1812. The story also encodes the prevalent underlying sandstone bedrock in Chardon. The boring details of that original historical event got replaced with something interesting.
In some cases, historical events that are interesting in and of themselves retain their original narrative form. A good example of that is "Brady's Leap" in Kent, Ohio and the associated frontier adventure story. Since the event was cool and kick ass, the man's name and the details of the event is in the lore.
The vampire character blends together many real world concepts into a mythological character. One that I think is particularly intriguing the the element of the Hades/Persephone story that involves pomegranate seeds. Hades basically gets to keep Persephone because she ate the pomegranate arils. I read/heard many attempts to explain this element of the story.
Persephone being married to Hades is a seasonal myth. Hades is the king of the underworld, which is often equated with winter, that is the dead time of the year. To a modern person it doesn't make any sense that the king of the underworld and especially winter world would also be associated with wealth, which is the lean time of the year. Hades association with wealth spills over into the vampire myth: Dracula is even a "Count" and he lives in a castle.
The Arils component of the story involves "a deal" that Persephone broke, or was tricked into, depending on the version of the story. Why would that element of the story hang around for thousands of years?
I think that story is really about an ancient "seed monopoly" from the dawn of agriculture. I think that's also where the concept of interest comes from. This is also why "Hades" is associated with wealth, not the common interpretation that the concept was all wealth came from the underworld... which also makes no sense, unless you're talking about a mine, like a silver mine, which was another thing which was frequently monopolized.
Death and blood are at the core of the Hades/Vampire story for fairly obvious reasons... how is a monopoly built and maintained? murder and destruction.


