Titan Army

The Titan Army refers to the second army of Titans that came around in The Sea of Monsters and The Last Olympian. Led by Kronos, the Lord of Time, they fought in every battle in the Second Titian War. Their base of operations was Mount Othrys until it was destroyed in The Last Olympian.

Gods/Titans

 * Kronos
 * Hyperion
 * Janus
 * Hecate
 * Morpheus
 * Nemesis
 * Atlas (currently trapped under the sky)
 * Oceanus
 * Krios
 * Melinoe
 * Iapetus (Joins the Olympians)
 * Prometheus
 * Pompona
 * Aigaios
 * Koios
 * Khione
 * Gaia

Known Demigods

 * Luke Castellan
 * Ethan Nakamura
 * Silena Beauregard
 * Chris Rodriguez (Later joins the Olympian Army)
 * Other unnamed soldiers.

Monsters

 * Hellhounds
 * Kelli, Tammi, and other empousai
 * Queen Sess and the other Scythian Dracanae
 * Pit Scorpion
 * Minotaur
 * Morrain and other Hyperborean Giants
 * Cyclopes (the horrible type of Cyclops family, not Tyson's side of the family who are the Elder Cyclops and help the Olympians)
 * Laistrygonian Giants
 * Antaeus
 * Colchis Bulls
 * Stymphalian Birds
 * Dr. Thorn
 * Nemean Lion
 * Kampe
 * Crommyonian Sow
 * Lydian drakon
 * Aethiopian Drakon
 * Telekhines
 * Agrius and Oreius
 * Geryon (fought and killed by Percy who eventually used an arrow and quiver to kill him)
 * Keres
 * Harpies
 * Giant Crab
 * Orange Sea Serpent, Giant Squid and other sea monsters.
 * Sphinx

Destruction
Following the Battle of Manhattan in The Last Olympian, most of the monsters had been killed, along with Kronos and Hyperion. The remaining Titans fled and went into hiding. The minor Gods were accepted back into Olympus, and presumably given thrones. Prometheus claimed he only wanted to control the damage.

In the Lost Hero, it is revealed that Jason Grace, son of Jupiter, led the Roman Demigods to the mountain and destroyed it, at the same time Percy was batling Kronos.