Board Thread:Skyrim/@comment-121.73.91.72-20130523094101/@comment-6881629-20160121103354

They said they got the sword from Sky Haven but it got erased by a dlc issue (and it doesn't respawn), like i said just above on a PC a new sword could be spawned with that command. On a console you'd need to reload a save from before it got erased (but again it can be a good weapon but not it's essential).