The Drifter's Cache

Walkthrough
Examine the four pieces of rubble scattered across Caridin's Cross, the quest starts once you examine any one of the piles. Once you do that, a chest will open where you fight the Ogre alpha. A good way to locate the piles of rubble is to walk around, holding down the Tab button. If you are a mage, you might want to use Swarm shapechanging power- it is a rather fast way to traverse the level as it can be frustrating to look for the piles. One is at the 'T' crossroad- where a number of darkspawn have made an outpost; behind where the Ogre alpha comes from; the large cavern where deep stalkers reside (once you open your map in Caridin's cross- it is the eastern most point. Once there- use Tab to locate the pile.);

Once you examine them all, the crate will appear in the cavern where Ogre alpha came from. This quest is mandatory if you want the entire Effort and Duty set.