This quest is not available in game.
Speak with High Thane Falstad Wildhammer at Aerie Peak in the Hinterlands.
As I mentioned earlier, I attempted to scout the temple on my own from the air. Well, I wasn't exactly alone.
I traveled to the renowned gryphon aviary at Aerie Peak in The Hinterlands. There I enlisted the aid of one of their finest pilots. The pilot fell off his mount, down into the swamp...
In my old age the poor fellow's name eludes me. The master of the aviary would remember, no doubt.
Journey there and seek out Falstad Wildhammer.
We need to find out what happened to that pilot.