Ghosts:

[Chronos]

Ghosts are spirits of the dead who are trapped in our world because they cannot go and rest. Normally these creatures cannot be controlled but powerful liches vampires and necromancers are able to control some of these spirits. Ghosts are ethereal creatures this means that they can move through solid objects, ghosts can not be harm in fighting only by laying the spirit to rest by exorcism or using blessed weapons have a effect on these creatures. There are many categories of ghosts.