Diary of Farnirras the Pensive

Text
The diary is badly damaged, and some of its pages are torn out. The surviving fragments are written in a neat, large-lettered handwriting.

Source
Found together with the Unholy Flail +4, The Key to the Magical Prison and Message from the laboratory of Farnirras in the hidden (in your Capital) underwell laboratory of Farnirras after the Uncanny Well throne room event.