Quelaag's Sister is a character from the video game series Dark Souls. She is known as the Fair Lady and resides in the Demon Ruins. Unlike her sister, Quelaag, who is a boss enemy, Quelaag's Sister is a non-hostile character who aids players by providing healing and support. Quelaag's Sister is a half-human, half-spider being, cursed by the Chaos that affected her family. She is often found near a bonfire, where players can interact with her to receive the Estus Flask and other benefits. Her tragic backstory and connection to the Chaos Witch theme add depth to the game's lore.