The Exorcist is a priest or priestess that do battle against the unholy beings from Hell.  It is a technique that has been past down from priest to priest.  In the past Exorcist would exorcises people from demon spite mental problems.  Now a days exorcism is only given if there no psychological problems, or other mental problems.  Once all things are excluded it will come to be non supernatural the priest will visit the person.  Rule number one of a exorcist is that a exorcism is on holy grounds such as a church or convent.  Once the demon gives its name exorcist can exorcise the demon from the body.  There is more rules but this is the basics.  Exorcist is sometimes called in to remove goblinsghosts and poltergeists from homes.
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