WARNING! This article contains major SPOILERS for George R.R. Martin’s Fire & Blood book, on which House of the Dragon is based!King Aegon II Targaryen wields the historic Targaryen sword Blackfyre in House of the Dragon, but that weapon mysteriously goes missing before Game of Thrones timeline. While the ancestral swords carried by members of House Targaryen in House of the Dragon play a convincing factor in the legitimacy of their claims, the two most prized ones, Blackfyre and Dark Sister, are both gone during Game of Thrones. One might assume that the fall of the Targaryen dynasty played a role in Blackfyre and Dark Sisters disappearances, but that might not be the exact case.