Varför använder Valyrian Steel Oathkeeper Dunks vapensköld?

Brienne hade Dunks armar målade på en sköld under resa genom Crownlands och Riverlands

Efter att ha anklagats för att mörda Renly, åkte Brienne North för att försöka hitta Lady Starks döttrar och skydda dem. Efter att ha blivit utgiven av Jamie, kan hon inte längre bära hus Tarths armar, eftersom hon skulle markeras som en mördare. Hon påminde därför armarna i ett hus hon aldrig hade känt, vilket hände till Ser Duncans

The arms of Tarth were quartered rose and azure, and bore a yellow sun and crescent moon. But so long as men believed her to be a murderess, Brienne dare not carry them.
A Feast for Crows: Brienne II

"You did beautifully," she said, when the woman showed her the freshly painted shield. It was more a picture than a proper coat of arms, and the sight of it took her back through the long years, to the cool dark of her father's armory. She remembered how she'd run her fingertips across the cracked and fading paint, over the green leaves of the tree, and along the path of the falling star.
ibid.

The arms of Tarth were quartered rose and azure, and bore a yellow sun and crescent moon. But so long as men believed her to be a murderess, Brienne dare not carry them. “Your door reminded me of an old shield I once saw in my father’s armory.” She described the arms as best she could recall them.

The woman nodded. “I can paint it straightaway, but the paint will need to dry. Take a room at the Seven Swords, if it please you. I’ll bring the shield to you by morning.

...

The captain’s sister found her in the common room, drinking a cup of milk and honey with three raw eggs mixed in. “You did beautifully,” she said, when the woman showed her the freshly painted shield. It was more a picture than a proper coat of arms, and the sight of it took her back through the long years, to the cool dark of her father’s armory. She remembered how she’d run her fingertips across the cracked and fading paint, over the green leaves of the tree, and along the path of the falling star.”

Så bilden visar helt enkelt Briennes svärd och sköld som de visas i En fest för kråkor .