This article includes content relating to the Dance of the Dragons, and therefore contains potential spoilers for House of the Dragon, as revealed in GRRM's writings. Anyone wishing to remain completely spoiler free for the new show should avoid any articles displaying this tag.
- "Visenya Targaryen was a great warrior. She had a Valyrian steel sword she called 'Dark Sister'."
- ―Arya Stark
Dark Sister was the name of the Valyrian steel sword belonging to Visenya Targaryen, the sister-wife of Aegon the Conqueror. A great warrior, she used it in battle as well as riding her dragon during the War of Conquest. Dark Sister is a comparatively thin and light blade, because it was the chosen weapon of a female warrior - though as it is made of Valyrian steel, it is still very strong and sharp.
- "Aegon Targaryen's Blackfyre and Visenya's Dark Sister disappeared in Daemon Blackfyre's rebellion."
- ―Jorah Mormont
In the books
Dark Sister is mentioned in the Tales of Dunk and Egg prequel novellas, set more than eighty years before the events of the series. It is one of two Valyrian steel swords belonging to House Targaryen, the other being Blackfyre. Dark Sister was wielded by Visenya Targaryen, Prince Daemon Targaryen, and later Prince Aemon the Dragonknight. One of the bastard sons of King Aegon IV, Brynden Rivers, known as "Bloodraven", was the last known wielder of Dark Sister. He used it at the Battle of the Redgrass Field in his famous duel with his half-brother Aegor "Bittersteel" Rivers.
It is unknown what has become of the sword (similarly to its sister-blade Blackfyre) after Bloodraven was stripped of his titles and exiled to the Wall. According to George R.R. Martin, Bloodraven took the sword to the Wall, but its current whereabouts are unknown.