I'll write you the task flow, and wish you get it as soon as possible.
First of all, take on the task of archivist of "Duke Nicholas Serenhoff of the Church of Hope in the Eastern Plague" (6 1):
Go to the bloody area of Stansom (front door), kill the archivist, burn the book, and then hand in the copy.
Note: You must hand in this task first, and then kill Balnazzar before robbing it. Remember!
Second, then return to the bloody area and kill the boss Balnazzar. Trophy to its head can trigger the "(62) terrible truth" task:
I want you to send your head back to camp.
Third, after that, Duke Nicholas Serenhoff will give you the task of "(62) surpassing".
Go to the dead zone (back door) of Stansom and kill the last baron, Boss rivendell.
Fourth, after returning to the camp with the baron's head, there will be another task, to go to the church to receive reward items, one of which is the one-handed sword "Silver Avenger".