From the Chasing Oswald quest introduced in Throne of Destiny (Expansion).
Found on a Corpse at the end of the Lugian Ice Tunnels.
Note to Alvirre
A note found on a dead Viamontian.
Dear Alvirre,
I wish to compliment you on your competent and discreet service. There is one more favor that I will ask of you. I know that you have some access to the royal archives in the princeling's gaudy new palace. I know that the princeling sent many of his minions on exploratory expeditions all over the islands, and that all notes from these expeditions end up in those archives. I would consider it a great favor if you could dig up any notes on the expeditions that went to the Ruschk fortress located at 87.3N, 51.8W.
-- -O.