Nico's sword is a three-foot-long black sword forged from Stygian iron that has the power to suck away its victim's essence. Nico di Angelo acquired it sometime between The Titan's Curse and The Battle of the Labyrinth. The origin of the sword is currently unknown, but there is a possibility that Nico forged it himself in The Battle of the Labyrinth when he is seen in a camp ground near the River Styx.