The only Dragonborn Battalion to escape largely intact after the initial onslaught of the Ancient Evil, only to become ten times decimated at the Battle of Smoragdus and Aquillus. The entire Thirteenth legion died to a Dragonborn under their banner.
Unknown to most, the Thirteenth Legion was betrayed by the Elves and used as bait to lure the great Emerald Dragon Smaragdus into a trap.
Unknown to most, the site of the legions demise was a narrow inlet in the southern wall of the cavern which is now haunted by the spirits of the legion. The Elves took care to disguise the natural entrance of the canyon to prevent its discovery.