No RamBlade, the Shield is indeed not in poisonous Brocken Valley 
 
 Zandalor has something to do with that shield ... and where is Zandalor you think? 

I don't know where you are, but if you're not already level 30, wait for that shield ... and the shield is for a Main Quest, 
not necessary to do it fast .. you can easy first do all side-quests.  
