Quelaag's Furysword is a unique weapon found in the video game Dark Souls. It is a curved sword that deals both physical and fire damage, making it effective against various enemies. The sword is associated with Quelaag, a character known for her connection to fire and her tragic backstory. To obtain Quelaag's Furysword, players must defeat Quelaag, a boss located in the Demon Ruins. The weapon scales well with the player's Dexterity and Intelligence, making it a popular choice for builds that focus on speed and magic. Its design reflects the game's dark fantasy aesthetic, featuring a fiery blade.