There are magical objects aplenty in HBO's Game of Thrones, but the show's canon doesn't touch on the Horn of Winter. Examples of a few legendary, powerful, and magical artifacts that made it from lore into Thrones are Lady Melisandre's Ruby, the White Walkers' ice blades, and the special iron coin of the Faceless Man. The very mention of the Horn of Winter, however, remained conspicuous by its absence.