This is the belief that ghosts can cause illness and death. Many tribal societies and those that follow and animistic approach believe there is a time period, usually a few days where the soul remains close to its body after death.
These few days are dangerous to the living because the ghost is lonely and seeks the living for company. Children, because their souls are weaker, and haven’t attached to the body as firmly, are at higher risk. Ghost sickness is part of the reasons behind so many death and funeral customs.
Russian folklore believes any dying person can be possessed before death a witch will reanimate the possessed body. The body will become an Eretik or “heretic”.
Other ways of becoming an Eretik are living life as a heretic, selling your soul to the devil, sleeping on a grave, or making inappropriate noises in a bathhouse.
As soon as the vampire is created, it begins its hunt of consuming flesh and blood first from its family, then from others. Its feedings will make people die.
Eretiks have the most vicious look that anyone who sees his angered expression will die.
It lives in dry riverbeds where it routinely performs Black Masses. It’s most active at night and in spring and fall.
While this vampire is, a living being it must be killed by traditional vampire killing methods: a stake through the heart followed by beheading and burning the remains to ash.