Exorcism
In Catholic Christianity, exorcisms are performed in the name of Jesus Christ. A distinction is made between a formal exorcism, which can only be conducted by a priest during a baptism or with the permission of a bishop, and "prayers of deliverance" which can be said by anyone.
The Catholic rite for a formal exorcism, called a "Major Exorcism", is given in Section 11 of the Rituale Romanum. The Ritual lists guidelines for conducting an exorcism, and for determining when a formal exorcism is required. Priests are instructed to carefully determine that the nature of the affliction is not actually a psychological or physical illness before proceeding.
List of D.Gray-man characters
In addition to those Exorcists chosen by Innocence, there are Exorcists referred to as Second Exorcists and Third Exorcists. The Second Exorcists were created nine years ago as part of the Synthetic Disciple Project, forced upon the Chan and Epstein families by Central; they are created by transplanting the brains of deceased Exorcists into new, artificial bodies, in hopes of re-synchronizing the Innocence. Yu Kanda and Alma Karma are the only successful subjects in this group. Using a piece of the original Akuma Egg, members of the Black Order also created the Third Exorcists. The Third Exorcists are fused with dark matter and Alma's cells to become partially Akuma themselves; they gain mutated arms that can absorb and destroy Akuma.