Clyde
This malevolent spirit is the only spirit that helps the living visit their past. He merely opens the door to the past�he does not guarantee that the trip will be a pleasant one.Clyde ignores summoning spells, so the only way to summon him is to make him angry by calling him names.
Ghosts
Ghosts are spirits of the dead who manage to cling in our world because of unfinished business from their life, usually avenging their unjust death. Neophyte ghosts are unable to grasp the physical plane, but in time ghosts can learn to move objects and even become corporeal.