Incorporeal Entities

History
Ghosts, spirits and poltergeists have existed for as long as there is something for one to come from, such as a demon or a human.

Ghost
Ghosts are typically benine, and are merely the bodyless souls of humans, that roam the earth as little more than an unchosen alternative to the afterlife.

Spirit
A spirit is typically characterised as being attached to a specific item or place, such as a murder weapon or a place of death, the only way that a spirit can escape this place is by finding a suitable host to possess and use to escsape their incarceration.

Poltergeist
A poltergeist is cpable of affecting the world around it, and becoming visible to the mortal eye at will.

Ghost
Unlike in myths there is no way for a Ghost to pass on from their incorporeal existence, and so they are condemed to forever roam the earth, only able to haunt the living.