I can't retrieve the Dun Banner because I made the mistake of talking to the wraith guarding it by not killing or answering the wraith's questions. Unfortunately I played several hours and leveled up considerably after my initial encounter with the wraith. I avoid walk-throughs that may note the bug because I want to experience the game without any hints etc. I can't believe this bug hasn't been patched.

Are there any fixes without reloading a previous save? Could I create a dun banner and place it within my game using redkit 3.4 mod patch?

If there is no work-around without losing hours of game play, I'll simply stop playing the game.