Methods to ward against Demonic entities
Thifur walks into the library, to see if he can learn more about how to create a warding circle to prevent demonic interference. He knows of materials such as silver, and yew, but is curious if there is other methods that can be used.
He finds nothing that isn't already there.
The librarian mentions, of course, a reward if the dwarf brings a text or writes a method on how to do so.