Imperial Gold

Imperial Gold is a material that can destroy monsters. It is made by consecrating it in the Temple of Jupiter on Capitoline Hill in Rome. The metal is extremely rare, but very powerful. It seems to be the Roman version of Celestial bronze. Like the Roman emperors, it is quite volatile, as stated by Medea. It explodes in a ring of force when broken, as shown when Jason's javelin broke when he fought Enceladus, but this blast is not lethal to stronger monsters. Imperial Gold is slightly harder and stronger than Celestial bronze and because they are forged from the Temple of Jupiter, they can be use to harm storm spirits. Also weapons made of Imperial gold will always return to their owners unless destroyed.

Trivia

 * Jason's coin, Ivlivs is made of Imperial gold.
 * Imperial gold, along with Celestial bronze and Stygian iron, are the only substances that can destroy monsters and harm immortals.