This Book of Knowledge is found within Caustaw Castle. You can only access the castle during and after the King Killer main quest. Once you’ve stormed the castle and you’re in the main hall, find nearby fire pot and throw it at the breakable rock barricade nearby to enter into the room with the book of knowledge.
Caustow Castle is a fortress that you’ll siege during the story arc in Sciropescire (left), you can only get to the book of knowledge via the siege/ (right)
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