The black book knowledge
The door will only unlock if you complete the quest "Reluctant Steward".
Here is a reference page for the book in question: http://elderscrolls.wikia.com/wiki/Black_Book:_The_Hidden_Twilight_(Book)
The door will only unlock if you complete the quest "Reluctant Steward".
Here is a reference page for the book in question: http://elderscrolls.wikia.com/wiki/Black_Book:_The_Hidden_Twilight_(Book)