Received from: automatically after finding the last sign on the Chasind trail [Korcari wilds]
Description: Start off by exploring the western ruins (M22, 2) where you had a chance to complete a different side mission. Find a chest containing Rigby's field journal. Read the document to find about the existence of the signs on the Chasind trail. You may now start finding them. The first sign is located nearby (M22, 11).
Each time you've touched an object a new marker will appear on your personal map (in one case - two markers). Use this clue to find the next trail (keep "scanning" the area with your mouse until you find an interactive item). The last object will be hard to find - you'll have to search the bushes near the bridge where you've defeated one of the mini-bosses.
The game will now inform you that you've been able to figure out where to look for the treasure. Use your map and head south (M22, 12). Be careful, because when you approach the campsite you're going to be attacked by a small group of camouflaged assassins. Deal with the darkspawn and examine one of the trees to find barbarian's mace, Chasind crusher, Korcari bow and Thane's helm.