Magical Metals

Description
In the world of the Olypians there are, currently three known metals that can be used by Demigods to fight against monsters and other evil creatures, as well as Gods and other Demigods.

The Greek Gods and Demigods use Celestial Bronze, Romans use Imperial Gold , and Hades - as well as those who live in the Underworld (such as the children of Hades like Nico) - use Stygian Iron.

Celestial Bronze
Celestial bronze is mined from Mount Olympus, then forged by the Cyclopes, tempered in the heart of Mount Etna and cooled in the River Lethe. The metal does not harm mortals, considering them not important enough to injure, and is strong enough to cut through a steel door. It is also been mentioned that this metal glows when in weapon form.

Known weapons made of Celestial Bronze :

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 * The Master Bolt
 * Wristwatch Shield
 * Annabeths Bronze Knife
 * Maimer
 * Backbiter (half Celestial Bronze)
 * Aegis
 * Chameleon Armor
 * Thalia's Spear
 * Katoptris
 * Festus

Other weapons possibly made of Celestial Bronze:

 * Poseidens Trident
 * Hermes's Caduceus
 * Ares's sword

Imperial Gold
It is unknown where Imperial gold is mined from, but it must be consecrated it in the Temple of Jupiter on Capitoline Hill in Rome. The metal is extremely rare, but very powerful. It is also quite volatile (as shown when Jason 's spear broke and created a giant crator in Mt. Diablo ). It is also thought that because of the blessing of Jupiter these weapons are more effective against Storm Spirits. This Metal is favored by Roman Demigods.

It is unknown if the Roman aspect of the Gods carry weapons made of Imperial Gold or Celestial Bronze.

Known weapons made of Imperial Gold:

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Stygian Iron
A metal rarer that both Celestial Bronze and Imperial Gold, forged in the Underworld and cooled in the River Styx. A weapon forged from this metal is so powerful that only a God, or a Demigod child of the Big Three are able to wield it. Where weapons made from the other Blessed Metals cause Monsters to disentigrate, Stygian Iron absorbs their essence.

Known weapons made of Stygian Iron:

 * The Sword of Hades
 * Nico di Angelo's Sword