Many believe ghosts to be real. Souls of dead people who still have unfinished business in the land of the living and thus unable to pass on into the afterlife. They remain bond to the places of emotional attachment, haunting them, scaring the hell out of eventual passersby and patiently waiting for their current situation to take a turn for the better.
Some people think ghosts are a mere hallucination, a mind trick happening to the emotionally unstable. This may actually be true, since no harm is caused by them and visions usually start to vanish after some time.
Ghost is immune to physical damage.
Ghost does not deal any damage.