to obtain: you'll need a key that you obtain following the warsworn faction quests. the key is called the "warsworn monument key". once you have the key, go to shieldring keep. in the southwest wing of the keep, where the blacksmith, merchant, forge, and trainer are, the door is just to the right at the end of the hall where it meets the services area. the chest is at the very end of the path behind the hidden door. behind the hidden door, follow the path down, follow it around to the right as it leads back towards the hall, and the chest is out in plain sight. use the key to open the chest and loot it.