NOTE TO Franz: All of this information here in the 'Main Quest' lore pages is not known by the NPCs unless they are specifically mentioned to know about a piece of information.
When travelling to @Qintarra through @Hardin's Pass you will find the REAL Stillwater Giant.
Upon arriving to @Qintarra, you need to find the @Silver Lady spoken of when talking with @Loghaire Thunder Stone.
Before doing so, you must convince @The Silver Lady’s daughter, @Raven, to let you in to see her. You must remove the humans from the sacred elven grove - @Falcon's Ache, without using violence. @William Bench and his men are planning to log the surrounding forests. If you attack him, your entire party will die.
Possible solutions
Antagonize @William Bench so he will attack you (resulting in the his untimely death)
Convince him that you are working for @Gilbert Bates and it is in his interests to forget about the grove.
Returning to @Qintarra and talking with @Raven, she lets you talk with the @Silver Lady.
The @Silver Lady speaks in riddles, after finishing talking with her and speaking with @Raven who interprets what she has said, it seems you must return to @Tarant to find an individual called Renford A. Terwilliger.