Wraiths traditionally have been identified in folklore as a kind of ghost, with the word originating from Scottish. It is currently unknown what the etymology of the word is, or how it came into popular use to describe the demon we currently associate the term with.
Wraiths tend to live in places where the dead reside. They are a kind of bottom-feeder, typically feeding on human remains. Many of the effects on remains caused by wraiths are associated with natural decay. All of this being said, living humans still are not safe from them.
If you feel an exceptional chill near a place where the dead are housed, you know a wraith is near. Light and warmth will keep them at bay, but only temporarily. With enough time or numbers, they will still be able to come after you. Leave ASAP and report the sighting to your nearest demonologist.
The exorcism of wraiths requires exhuming all human remains in an area, which is not typically ideal, due to time investment and taboo. Usually it is easier to use inscribed urns to restrict the movements and feeding practices of wraiths, keeping them in a state where they are much less likely to harm the living.
Despite the work involved and the social taboo of exhuming graves, exorcisms should be carried out when large numbers of wraiths are gathered in a single location. Large numbers may become bold enough or require enough food that they may begin to feed on the living in the surrounding area.
Simply removing all human remains from the vicinity, and inscribing runes around the area is usually enough to exorcise wraiths. Removing the remains deprives them of their food source, and runes will keep them from leaving to find new feeding grounds. Ideally this will starve them to death.
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