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Celestial bronze is mined by the Cyclopes from Mount Olympus. The ore is shaped by tempering the metal in Mount Etna and cooling it in the River Lethe. The metal is deadly to creatures of the magical world. Unlike mortals, demigods are also affected by it because of their blood. Artifacts of celestial bronze are known to emit a faint golden glow. The metal is able to disperse monsters into dust once a weapon made of celestial bronze passes through them. Then monsters transfer into Tartarus.
Known Celestial Bronze Weapons
- Annabeth's knife
- Backbiter (half steel)
- Thalia's Spear
- Zeus' master bolt
- Poseidon's trident
- Orion's mechanical eyes
- Orion's bow (the handle)
- Percy Jackson's kopis
- According to Reyna, celestial bronze is much rarer than Imperial gold, although this might have been due to the Roman's camp location.
- Celestial bronze is one of three magical ores, the others being Imperial gold and Stygian iron. However, in Percy Jackson's Greek Gods, adamantine is also mentioned.
- Celestial bronze gives off a faint light, as in the case of Riptide.
- Celestial bronze and Imperial gold are the only known metals which turn monsters into dust.
- "Celestial" means "from the sky" or "heavenly."
- While celestial bronze is normally mined from Olympus, if Hephaestus is upset with his work, he throws pieces of celestial bronze into the mortal world.
- As it is not silver, it cannot harm lycanthropes.
- Unlike Imperial gold, celestial bronze seems almost as abundant as iron to Greek demigods, as not only their weapons made out of it, but it seems like almost everything the Greek demigods make is made out of it, using it as a magical alternative to what other metals would normally be used for weapons, though this is justified as it's mined from Olympus which is right above the Empire State Building.
- Annabeth's father, Dr. Frederick Chase, melted down her weapons and turned them into bullets, which he fired at monsters out of his Sopwith Camel in The Titan's Curse.
- Celestial bronze can hurt the Egyptian magicians as seen in The Son of Sobek.
- In The Demigod Diaries, Luke Castellan says that he once had a sword made of celestial bronze but it was destroyed by the acid of a monster, suggesting it's vulnerable to acid.
- Celestial bronze is the sacred metal of the Greeks, which explains why Camp Half-Blood mostly uses celestial bronze weapons, while Camp Jupiter uses mostly Imperial gold ones.
- The Norse counterpart of celestial bronze is bone steel.
- Celestial bronze draws parallels to orichalcum, the mythical metal of Atlantis. Orichalcum means "mountain copper"; celestial bronze is mined from Mount Olympus and mortal bronze is made of copper. Orichalcum is described as a valuable and rare metal, like the magical ores in the series. Orichalcum is associated with gold and is said to glow, and celestial bronze glows gold.
- In Demigods & Magicians, when a demigod grasps a magician's wand, it transforms into a celestial bronze weapon best suited to the wielder. For Annabeth Chase in the Staff of Serapis, the wand transformed into a celestial bronze dagger like her old one while for Percy Jackson in the Crown of Ptolemy, the wand transformed into a celestial bronze kopis, a Greek version of the Egyptian khopesh sword.