According to Fenarian legend, this was a magical sword that was revealed to Fenarr by a magical táltos horse. (See Bölk).
This was in actuality a Morganti blade that Fenarr (or Crionofenarr) then took into Faerie (Dragaera) and used when he made a treaty with Khaavren and the Dragaeran Empire.
As a part of the treaty, Fenarr was forced to give up this sword to Adron e'Kieron.
Its later disposition is unknown, but has been speculated.