The Great Trials is a book found in Dishonored.
Spending two years in the company of heretics, the insane, and those rare, black-hearted villains who were truly practitioners of magic, I can say with truth that I have seen such things as to break the minds of most. While the trials and burnings weigh heavily upon my heart, I must chronicle what has been a unique opportunity to witness the multifarious perversions that the Outsider bestows upon those who seek his black council.
Many of those we faced were accused of bewitching their neighbors or family, controlling them from afar, or even walking around in their skins. And I have seen this with my own eyes, as one woman slid into the form of another, prowling unseen until a vigilant Overseer struck down both the witch and her host.
Our work was dire, we knew, for if the followers of the Outsider can truly inhabit the skin of another, or move from place to place like the wind, then how can we hope to erect walls to keep him out? It was these trials that first led us to investigate barriers beyond the physical.