From my brief experiences with vengeful spirits, you deal with them in two ways: The first being charms that ward off evil or restless spirits back from whence they came. The other is that they tend to be restless on the fact that they have unfinished business, so they'll mess with people until they eventually give them what they want or accomplish their goals for them. Like revenge, or to go on a date with a woman that looks like their lover.
[Ignore how specific that last example is.]
Maybe try digging around the place and ask questions of if there's been any people who've died long ago. See if there's possible any wives tales and folklore that match up with this, and found out what the ghost may want.
Could also just be a curse, since the discoloration sounds like the first sign of one. Or a disease, that too. Do we know how many people are afflicted? Could it spread from being too close to someone?
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From my brief experiences with vengeful spirits, you deal with them in two ways: The first being charms that ward off evil or restless spirits back from whence they came. The other is that they tend to be restless on the fact that they have unfinished business, so they'll mess with people until they eventually give them what they want or accomplish their goals for them. Like revenge, or to go on a date with a woman that looks like their lover.
[Ignore how specific that last example is.]
Maybe try digging around the place and ask questions of if there's been any people who've died long ago. See if there's possible any wives tales and folklore that match up with this, and found out what the ghost may want.
Could also just be a curse, since the discoloration sounds like the first sign of one. Or a disease, that too. Do we know how many people are afflicted? Could it spread from being too close to someone?