Candido Amantini was what type of priest, able to cast out demons?
Exorcist In some religions, an exorcist is a person who is believed to be able to cast out the devil or other demons. A priest, a nun, a monk, a healer, a shaman or other specially prepared or instructed person can be an exorcist. An exorcist is a person who performs the ridding of demons or other supernatural beings who are alleged to have possessed a person, or (sometimes) a building or even an object.
Demonology Demonology is the study of demons or beliefs about demons, especially the methods used to summon and control them. The original sense of "demon", from the time of Homer onward, was a benevolent being, but in English the name now holds connotations of malevolence. (In order to keep the distinction, when referring to the word in its original Greek meaning English may use the spelling "Daemon" or "Daimon".)