If you say to Master Raska What about Gandan Tailfist he says: Gandan Tailfist was the commander of a small band of Swiftails which bandits have information regarding him. If you have a clue as to his whereabouts, hand it over! Unless it's merely half of a note. That would do me no good.. I require the full note.
Upon giving him both halves he says: An old entry from the journal of [Gandan Tailfist] You have done well. unfortunately I have given up my search for the legendary [Whistling Fists]. Seasons and seasons of all my patrols have ever found was this worthless flute! (He gives you an Ancient Thin Flute) This journal listing is obviously false. There is no such thing as the lost valley.