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. Percy Jackson describes it as being, "black as a nightmare and truly frightening."
- Nico uses it to summon as well as banish the dead by stabbing it into the ground.
- The sword sucks the essence of the killed monster into the sword, so the monster stays in Tartarus longer.
- The sword strikes fear into its owner's enemies.
- The dead are scared of the sword and stay away from it.
|Personal Weapons:||Riptide | Annabeth's Knife | Backbiter | Frank's Spear | Hazel's Spatha | Katoptris | Nico's Sword | Thalia's Spear | Aegis | Maimer | Kronos' Scythe | Ivlivs | Master Bolt | Poseidon's Trident | Sword of Hades | Reyna's Spear | Hades' Staff | Juno's Gladius|
|Magical Items:||Annabeth's Yankees Cap | Helm of Darkness | Keys of Hades | Flying Chariot | Golden Apple | Greek Fire | Hermes' Multivitamins | Leo's Magical Toolbelt | Nectar and Ambrosia | Pandora's Pithos | Winged Shoes | The Golden Fleece | Stygian Ice Whistle|
|Spoils of War:||The Minotaur's Horn | Medusa's Head | Kampê's Scimitars | Nemean Lion's Pelt | Gorgon Blood | Cornucopia|
|Items:||Camp Necklace | Chameleon Armor | Daedalus' Laptop | Golden Drachma | Mark of Athena | The Pax | Video Shield | Wristwatch Shield | Golden Mango | Sibylline Books|
|Blessed Metals:||Celestial Bronze | Imperial Gold | Stygian Iron|