The Witcher Bestiary - Wraith
Wraith Occurrence: Wraiths haunt the places where they died or were buried; they are specters which do not belong in this world; sometimes they are summoned by magic, but more frequently unfinished business makes them linger in our world.

Immunity: Immune to blinding and bleeding attempts; they are fearless and immune to poison, pain and knockdown attempts.

Susceptibility: Sensitive to silver and Specter Oil.

Tactics: The suffering experienced by a wraith makes the wounds it inflicts more painful.

Alchemy: Death Dust and ectoplasm.

If you want to get rid of a wraith, you must first find its body. Try searching on unhallowed ground or in the corner of the cemetery where outlaws are buried. When you dig up the corpse, you will discover that it is not rotten and that there is blood on its lips. Pierce the corpse with an aspen stake, cut off the head and place it between the corpse's legs. To make certain that the wraith will never return, set the corpse on fire. One false step will mean your demise.