Titan Army

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

Gods/Titans

 * Aigaios
 * Atlas (currently trapped under the sky)
 * Iapetus (Joined the Olympians after losing his memory when Percy pushed him into the River Lethe)
 * Hecate
 * Hyperion
 * Krios
 * Nemesis
 * Melinoe
 * Morpheus
 * Oceanus
 * Pomona
 * Prometheus
 * Janus

Known Demigods

 * Chris Rodriguez (Later joins the Olympian Army)
 * Ethan Nakamura (deceased) (Kronos' right-hand man, but rebels against him at the last moment, then killed, but died a hero's death)
 * Luke Castellan (deceased) (Controlled by Kronos for most of the book, but sacrifices himself to destroy Kronos)
 * Silena Beauregard (deceased) (the spy for Kronos inside Camp Half-Blood but she was forced to do it, however she then joins Percy and dies a heroes' death)
 * Alabaster Torrington
 * Other unnamed soldiers and children of Hecate.

Monsters

 * Hellhounds
 * Kelli, Tammi, and other empousai
 * Queen Sess and other Scythian Dracanae
 * Pit Scorpion
 * Minotaur
 * Morrain and other Hyperborean Giants
 * Cyclopes (the Hyperborean Cyclopes, not Tyson's side of the family who are the Elder Cyclopes and are with the Olympians)
 * Laistrygonian Giants
 * AntaeusMount_Othyrs.jpeg, The Titan Army's headquarters.]]
 * Colchis Bulls
 * Stymphalian Birds
 * Dr. Thorn
 * Nemean Lion
 * Typhon
 * Kampe
 * Clazmonian Sow
 * Lydian drakon
 * Aethiopian drakon
 * Telekhines
 * Agrius and Oreius
 * Geryon
 * Keres
 * Giant Crab
 * Sea Serpents, 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 minimize the damage by joining Kronos so he could get out of trouble. In The Lost Hero, it is revealed that Jason Grace, son of Jupiter, led the Roman Demigods to Mount Othrys and destroyed it, while Percy and the demigods of Camp Half-Blood were battling Kronos.

In The Demigod Diaries, Alabaster mentions that Hecate had lost more children than any of the other gods in the war.