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In the end the Cathedral lost power after the betrayal at the Battle of Grantebryc - called the Bridge of Kham in Langkasuka - when the Oration with their analytical sorceries, their maiden knights and orisons, witchfinders and fanatics together overcame them, usurping and seizing their power.
The Oration declared a Great Reformation and a New Crusade, and I think this is why we saw the Ritterskeep in ruins and taken over by trolls!