Ivlivs

Ivlivs (or Julius) is a gold coin which belonged to Jason Grace until it's destruction.

Description
When flipped, it turns into a double-edged Imperial Gold sword or a lance depending on which side the coin lands on. The sword side has an image of Julius Caesar, while the lance side has an axe and the word Ivlivs. This could be a reference to the minted face of Julius Caesar in the coin. The name, when written in Roman alphabet - Ivlivs is pronounced as Yulius (as opposed to the anglicised version of the word "Julius"). The axe is a reference to the Caesar's victory over Gaul, in a symbol of an axe. The coin is currently destroyed.

The Lost Hero
When the teens from the Wilderness School travel to the Grand Canyon, Jason begins nervously rubbing Ivlivs when he is around Dylan. When it is seen by Leo, he says, "Dang, is that gold? You been holding out on me man?"

He first learns that it could turn into a lance when showing the other campers that he is a son of Zeus by calling down lightning. It was later destroyed by Enceladus when he fought Jason at Mount Diablo. It was later replaced by a gladius given to Jason by Juno (Hera). When Ivlivs turns into a javelin it is 7 feet long, made entirely of metal, with an extremely sharp tip. When it is a double edged sword it is 2 feet long, double-edged and probably one-handed with a ridged grip and it fits Jason's hand perfectly. When it is a coin it is thick, slightly uneven, and about the size of a half-dollar.

Trivia

 * Ivlivs would actually be pronounced and called as "Yulius" because in the Roman alphabet, neither "U" nor "J" existed and is then replaced by "V" and "I" respectively, with the 'I' changing it's form to a 'Y' sound in certain cases. One evidence is the name sign shown in government buildings where the U-V and J-I Roman alphabet rule is used.
 * The coin's two sides have Julius Caesar on one and an axe on the other, which refers to Caesar's victorious conquest over the barbarian tribes of Gaul (France) which were represented by an axe.
 * It somewhat resembles a Golden Drachma but it is an Aureus.
 * It was first revealed that Ivlivs was made of Imperial Gold by Medea when she showed them a forge that could melt Imperial Gold.
 * It was destroyed at the end of The Lost Hero. When Jason tried to pierce the back bone of Enceladus, it was smashed by his foe's javelin and it exploded in a blast of white hot fire. The blast released so much power it fused the sand and heat together forming a glass pit that Enceladus falls into.