High Overseer Campbell

High Overseer Thaddeus Campbell is a villain from Dishonored and is the High Overseer of the Abbey of the Everyman and is in league with the Lord Regent, Hiram Burrows, in his treacherous plot to usurp Empress Jessamine Kaldwin.

History
Despite Campbell's high position within the restrictive Abbey of the Everyman, he is known to lead an extremely decadent and deviant lifestyle. The Heart reveals that "He breaks each of the Seven Strictures daily. It is his own private joke." He maintains a secret chamber beneath the Office of the High Overseer that is filled with mattresses and lingerie, plus notes discussing his dealings with the Golden Cat and an audiograph regarding Corvo Attano's escape from Coldridge Prison. He keeps a rune in the room as well, in a protective glass case beside a copy of Litany on the White Cliff. Rumors of Campbell's lifestyle are seemingly known to the population of Dunwall; Samuel Beechworth comments on it himself, saying, "Maybe it's not my place to say, but men of the faith shouldn't live like barons."

Campbell regularly resorts to blackmail to achieve his aims, keeping a journal where he records secrets about a great number of Overseers. Teague Martin claims that it is through blackmail that he was able to ascend to the position of High Overseer. When Corvo is sent to eliminate Campbell, he is also tasked with retrieving Campbell's journal, which Martin in turn uses to ascend through the ranks of the Abbey.

Campbell is also willing to kill to retain his position; a note in his secret room from Madame Prudence reveals that he has murdered courtesans who have attempted to blackmail him.

Sometime after the Empress' assassination, Corvo is approached by Callista Curnow, niece of City Watch Officer Geoff Curnow. She states that Campbell is plotting to murder her uncle (due to tensions between the City Watch and the Overseers, and Curnow's aversion to corruption), and asks Corvo to stop him.

Non-Lethal Fate
If Corvo chooses to brand Campbell, public announcements in the next mission will state that providing aid to the former High Overseer is a crime. Campbell will then appear in The Flooded District mission as a weeper.

Lethal Fate
Corvo can choose to either poison his cup, kill him directly or have Curnow kill Cambell.