Celestial bronze

Celestial Bronze is a powerful,magical metal of magical nature made mostly by the cyclops' forges and Hephaestus. It is harmful only to gods, demigods, and monsters, so it is commonly used by them. The metal can also draw power from the domain of a god, such as Percy's sword Riptide (this is not common). Celestial bronze weapons will not harm mortals, as they are at a completely different level then Immortals and monsters. Take for instance, when Percy swung Riptide at Rachel Dare, it passed through her as if she was an illusion. 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. Demigods and gods favor celestial bronze weapons because they are able to wound immortals, and kill monsters and half-bloods, however it will pass through mortals like an illusion, whereas mundane iron or steel weapons bounce off of most magical beings uselessly. Its debatable at how strong Celestial Bronze is; for instance, Percy Jackson manage to cut through a steel car door as if it was made of plastic wrap but Geryon (a shepherd monster) manage to deflect the sword using nothing more than a pair of steel tongs, so its safe to consider that Celestial Bronze is comparable or somewhat greater than steel. Demigods, being half-god, can be harmed and even killed by celestial bronze. Celestial bronze is also used in god and demigod armor.

The strength of a sword made of celestial bronze may depend on the wielder.

Celestial Bronze can be used by humans since they touch the metal with something like sword's handhold with leather or other metals.

Notable Use

 * Riptide is Percy's Celestial bronze sword.
 * Annabeth has a Celestial bronze knife.
 * Zeus' Master bolt has a cylinder of high-grade Celestial bronze.
 * Colchis Bulls are forged from Celestial bronze.
 * Frederick Chase, Annabeth's father, melted down the weapons that she left in her room the last time that she ran away, and forged them into machine gun bullets for his Sopwith Camel bi-plane, which he used to kill monsters, buying time for Percy and his friends to escape during The Titan's Curse.
 * Luke's sword, Backbiter is half Celestial bronze and half steel. It is the sword version of Kronos' scythe

Trivia

 * Stygian iron is very similar to Celestial bronze, but it is mostly used by children of Hades, because it is made from the River Styx. Nico di Angelo has a Stygian iron sword.
 * Celestial bronze can be dissolved in liquid and dust which can be used as a weapon, as shown in The Last Olympian
 * Celestial bronze can be melted at high temperatures.
 * Imperial Gold is very similar to Celestial bronze, but is mostly used by the Gods and Demigods of Rome.