Roekosan

Traditionally little is known about the great beast known as Roekosan (Re O Co San) other than he is a mythical creature that used to rule or terrorize the country of Janmier. Those who are a little more aware think he was a powerful dragon who ruled over Janmier until his subjects turned on him and trapped him. The battle was fierce but Reokosan was mortally wounded. Desperate, Reokosan tried to preform a ritual to make himself immortal. When the Janmierians entered Reokosan's lair to find out what had happened, they found his body and thought him to be dead and gone forever.
The Party had the researchers at The Tower of Orien look deeper into the stories and were told that;
The tales tell of an ancient dragon that ruled over the whole nation of Janmier around 700 years ago, some sources say that he was a tyrant ruling by fear while others talk of him as a benevolent leader who saved the tribes from an evil water beast. According to the stories at first this united all of the tribes as his subjects but his apatite for both food and treasure was too great and the tribes struggled to keep him sated. Either the Forest, the Rivers or Reokosan, depending on which village is telling the story, taught the Janmier people new ways of hunting and ways to grow food themselves so that they could feed Reokosan more. 
It's unknown how long his reign was but towards the end of his life Reokosan became extremely paranoid and looked for ways to fend off death. He apparently created a new way to come back to true life after his death, but not using traditional necromancy. As preparations for his ritual began a civil war broke out with one side wanting to stop it, the other protecting it, those fighting against the dragon tell of a brave heroine known as the Aoi the Wisper, from the Nariko Tribe she was able to sneak in to Roekosans lair and discovered what the ritual required and when it would be best disrupted. These tales hail Aoi as the reason they won the war even though it cost her her life, the odd thing is that tales from Roekosans side also talk of how they won the war and his ritual was completed successfully.
The war raged on after Roekosan died now primarily over five artefacts of great power, they seemed to change hands a lot, though battles, theft, political pressure, allegiances being swayed, blackmail and deception. These artefacts were actually parts of Reokosan created as part of the ritual which involved Reokosan killing himself to craft these items, now infused with his magical ability they are needed to finish the ritual to bring him back to life. The five artefacts are known today as, The sliver of Roekosan, Roekosan's Thirsting Edge, Cape of the Shadowfell, Golden Mask of Roekosan and The Shattered Splinter. 
After the war it seems that the Sok-Saz Tribe ended up controlling three of these artefacts but the whereabouts of the other two were lost then approximately 100 years records indicate that invaders from the west came and stole the three artefacts which were the Sliver of Reokosan, Reokosans Thirsting Edge and the Mask of Reokosan.
In 6736 the Mask, Sliver and Edge were stolen and were involved in an altercation in Bluelog along with the Cape of the Shadowfell, which was also stolen around the same time. The Cape and Mask were returned to Duthgar and went to Tarcheck, while the Edge and Sliver disappeared, which caused tensions between Duthgar and the DRB.
The Cape of the Shadowfell was first discovered by an adventuring party deep within The Underdark and then acquired by the Throne of Duthgar after the adventure who was using it retired and sold it. The Splinter has been seen in multiple places at the same time, implying there may be fake ones out there, there is rumor of it being in a shrine in the Silent City and another was found in Mezzol by Brevikel Cadeyln a Torlund explorer but then lost when his ship went down near The Mithril Isles while coming back.