Exorcism
In Catholic practice the person performing the exorcism, known as an exorcist, is an ordained priest. The exorcist recites prayers according to the rubrics of the rite, and may make use of religious materials such as icons and sacramentals. The exorcist invokes God—specifically the Name of Jesus—as well as members of the Church Triumphant and the Archangel Michael to intervene with the exorcism. According to Catholic understanding, several weekly exorcisms over many years are sometimes required to expel a deeply entrenched demon.
The Devils (film)
Laubardemont summons the lunatic inquisitor Father Pierre Barre, a "professional witch-hunter," whose interrogations actually involve depraved acts of "exorcism", including the forced administration of enemas to his victims. Sister Jeanne claims that Grandier has bewitched her, and the other nuns do the same. A public exorcism erupts in the town, in which the nuns remove their clothes and enter a state of "religious" frenzy. Duke Henri de Condé (actually King Louis in disguise) arrives, claiming to be carrying a holy relic which can exorcise the "devils" possessing the nuns. Father Barre then proceeds to use the relic in "exorcising" the nuns, who then appear as though they have been cured – until Condé/Louis reveals the case allegedly containing the relic to be empty. Despite this, both the possessions and the exorcisms continue unabated, eventually descending into a massive orgy in the church in which the disrobed nuns remove the crucifix from above the high altar and sexually assault it.