Poltergeists are the undead spirits of the restless dead. The are similar to "haunts" but are considered more malevolent. A Poltergeist will shatter furniture and throw objects at living humans. Rarely ever seen, Poltergeists remain invisible and can attack at will, they do not allow themselves to be seen if it is at all possible.
Most often they are attached to a specific area and if that area is invaded or threatened in any way by the living, the Poltergeist will attack fiercely. The more evil type Poltergeists will haunt family's and partnerships, always attacking one member first and then once that member is weak enough, they will attack the others. They cannot be controlled by magic and they do not respond well to certain magical commands.
On the rare occasion a Poltergeist might be seen, they are said to be wearing rags and have chains wrapped around the bodies. They can however be removed from an area by a cleric or Priest, but it is strongly recommended that no person under attack from a Poltergeist attempt to remove them or enter into battle against them.