Mount Othrys

Mount Othrys (Όθρυς in Ancient Greek ) was the base of the Titans during the ten year war with the Olympian Gods, known as the Titanomachy or First Olympian War, and also during the Second Olympian War. It is said to be made of black marble. In the First War it was assaulted by the Olympians, and then Zeus used Kronos' scythe to cut him into a thousand pieces and cast him into Tartarus. Mount Othrys was located on Mount Tamalpais in Marin County.

The Titan's Curse
When Percy, Thalia, and Zoë found Lady Artemis, she was trapped under the sky next to the growing ruins of Othrys. Atlas fought against Percy, then Percy took Atlas's burden (the sky) from Artemis so she could fight. Zoe tried to protect Artemis from her father (Atlas), and in his rage, Atlas threw her into the ruins (where she died), which were becoming real around them.

Percy and his friends saw the ruins of it being magically re-constructed on the mountain - which meant Luke was raising Mount Othrys.

The Battle of the Labyrinth
Mount Othrys was still restoring, with the Titan fortress on the top. Percy witnessed the return of Kronos here.

The Last Olympian
Following the defeat of the Titans, Mount Othrys supposedly faded on its own as the Titans were beaten.

The Lost Hero
It was revealed that the Roman demigods assaulted Mount Othrys during the Battle of Manhattan and destroyed the palace. Jason Grace, demigod son of Jupiter, was personally responsible for bringing down Mount Othrys' guardian Titan, Krios (The Ram). Jason remembers this near the end of his mission. The campers of the Greek Camp Half Blood were led to believe that it crumbled due to the defeat of Kronos but they found out when Jason revealed it to them after remembering it.

The Second Olympian War
Towards the middle of the Percy Jackson and the Olympians series, it seemed as if Luke Castellan, under the influence of the Titan Lord of Time, Kronos (father of the Olympians), raised Kronos from the deep depths of Tartarus in the Underworld. Kronos wanted to retake the control of the power of Ancient civilization from the Gods and return humankind to the time when he was the lord of the Titans. His plan was to go to New York City, put a siege on it so that no other mortal could enter it from the outside, wage war on the Olympians, and (after defeating them), head to the Empire State Building and destroy Olympus itself.

However, with the help of the demigods from Camp Half-Blood and nature groups, the Olympian Gods managed to both defeat Kronos and the monster, Typhon. Mount Orthys was destroyed by the Roman Camp.

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