Spokuruna
Spokuruna originates in Latvia, mostly by accident. The country has been fought over several times over the last century or so, invariably by regimes nasty in word and deed, which means that there have been a lot of people killed suddenly, and with unfinished business. As anybody familiar with spectral phenomena can tell you, that’s an excellent way to get ghosts. And that is exactly what has happened in Latvia, as it has happened throughout human history. It mostly doesn’t matter, as most ghosts can’t be seen by anybody who isn’t Sensitive in a particular way, anyway.