Travel to the Path of Conquest in Shadowmoon Valley. Once you have done a preliminary assessment of the area, use the Wildhammer Flare Gun to signal a Wildhammer Gryphon Rider. Speak with Thane Yoregar at Wildhammer Stronghold in Shadowmoon Valley should you lose your Wildhammer Flare Gun and require a replacement.
My gryphon riders have come back with a bit of news! The Eclipsion blood elves are planning something big. They've begun forming their armies at the Path of Conquest, located east of here - adjacent to Eclipse Point.
I want you to travel to the Path of Conquest and assess the situation. Once you've done so, use this flare gun to signal a gryphon rider. One will swoop down from the sky to meet you. Tell 'em what you've discovered and they'll give you the next set of orders.