Hello. I have a problem with the sentence "Trollhauer" and "Der seltsame Schlüssel"

He writes that I am to go down in the valley to the deserted camp of hunters, including the fact that there is no such camp. I jumped the entire mining valley and nothing, no trace of the camp.

"Der seltsame Schlüssel"
Where are the 'stone chest' because the namelles supposedly said that Xardas mentioned it, but he did not do it and I do not know.