| Spoiler Alert!
Warning! This page contains spoilers for The Dark Prophecy.
|“||But it seems these men have been plotting against us for very long time. They funded Luke Castellan's war. They supplied aid to Camp Jupiter when the Romans attacked Camp Half-Blood. And despite those two wars, the Triumvirate is still out there-still plotting. What if this company is the root cause of...well, everything?||”|
Triumvirate Holdings is an organization with three powerful individuals who are said to be the three worst Roman emperors. They have forced others to worship them, which helped them gain their divinity. Currently, there are two identified members, Nero, historically considered to be one of the worst emperor of all and, and Commodus, who currently resides in Indianapolis. Triumvirate Holdings profits off events such as the Second Titan War. They are said to "own so much property and have so much money they make Rachel's dad's company look like a kid's lemonade stand."
The company is said to have existed in the shadows for centuries. During the Second Titan War, Triumvirate Holdings supplied Luke Castellan and his allies with the Princess Andromeda, weapons, helicopters and top human mercenaries. Then during the Second Giant War, they supplied Octavian, the former augur of Camp Jupiter, with weapons such as onagers. Their main objective in taking over the world is controlling the five Oracles which control fate.
Mortal thugs Cade and Mikey were sent to beat up Apollo who was made human as punishment, but they were driven off by Meg McCaffrey. Later, Apollo, McCaffrey and Percy Jackson were ambushed by Nosoi. They were defeated by McCaffrey's Karpos, Peaches, but were able to afflict Apollo.
Later it's revealed that Nero took up residence in the same Manhattan skyscraper where the two camps tried to make early peace. He has kidnapped several Camp Half-Blood campers and intimidated Meg McCaffrey to get Apollo to open the doors to the Grove of Dodona so he can burn it as the Holdings had no way of controlling the oracle since it is the most ancient of the five. When Nero arrives through the Myrmeke's Lair with his Germani bodyguards, he attempts to burn the captive campers, but a group Dryad's sacrifice themselves to save them. After that, Apollo puts some wind chimes he got from Rhea on a tree in the grove to save it, yet Meg sides with Nero.
Camp Half-Blood was then attacked by the Colossus Neronis. It managed to destroy the Demeter Cabin, the Dining Pavilion, and even the barrier surrounding the camp. Percy Jackson arrived with his dog, Mrs. O'Leary, to help. The automaton was eventually defeated when Apollo shot an arrow with hay-fever into its ear causing it to sneeze its head off.
Apollo travels to Indianapolis with Leo Valdez and Calypso in order to restore the next oracle. They are almost immediately attacked by Blemmyae but manage to escape to the Waystation. Commodus is revealed to have taken the Throne of Memory from the Oracle of Trophonius and spread monsters throughout the whole city. He gets mad at his prefects Vortigern, Marcus, and Cleander for letting Meg McCaffrey get away and annoy him. So he had his new man, Lityerses, son of Midas and Demeter, to kill them, take their place and stop Apollo.
Apollo and Calypso go to the zoo to free Britomartis' Gryphons, Lit and severeal Germani are sent to stop them. They almost succeed until Meg arrives to save them. Later when Apollo, Meg and Leo search Commodus' lair after entering through the Canal Walk and defeating the Carthaginian Serpent, they overhear Alaric telling the emperor he put beasts that cannot be killed to guard the Cave of Trophonius. The emperor plan to kill Lit and replace him with Alaric despite ordering Lit to destroy the Waystation by tomorrow morning. After killing another blemmyae, the three release the prisoners, Olujime, Sssssarah, Hunter Kowalski, and Georgina as well as obtain the Throne of Memory.
But then they stumble into the Lucas Oil Stadium in the middle of Commodus' naming ceremony rehearsal. He unleashes monsters, animals and mercenaries onto the field causing Apollo and Meg to fight back. Commodus ordered them to stop before revealing a bound Peaches suspended in the air. He prepares to kill the Karpoi by setting him on fire using a train. Apollo rides Livia, the elephant, to block the car. Then he cut off the helmet she was wearing and Livia flung it at the god emperor, causing him to swerve off the track and roll and crash on the field while Meg freed Peaches. Commodus was about to kill Lityerses for letting the Hunters of Artemis through but Leo arrives on Festus with the Thalia Grace and the Hunters of Artemis to save them.
The unkillable creatures guarding the cave to the oracle turned out to be Yales. They are endangered, Artemis and the other gods will curse you if you make them extinct, so Meg binds them with vines instead. Inside the oracle, Trophonius tortures Meg with memories of her past because she has volunteered to be the petitioner for his prophecy. After Apollo gives her CPR, Trophonius asks them to let the blemmyae inside, who were setting up a bomb as a last resort to get rid of Apollo, destroy the oracle as it too exposed, unable to be defended, and he no longer wants to work for Commodus. Apollo does so but also tricks them into blowing themselves up allowing them to escape. Commodus forces hold several of the Waystation resident's hostage while Olujime and Lityerses turn against him. Apollo miraculously unleashes his Divine Form causing Commodus to vanish and his forces to disintegrate. The prophecy Meg spits out reveals that the third emperor is planning to attack Camp Jupiter.
| Then there was the little one...
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- Meg McCaffrey (formerly)
- Lityerses (Commodus's second prefect, defected)
- Olujime (a gladiator of Commodus, imprisoned then escaped)
- Trophonius (unwillingly; Oracle)
- Cade & Mikey (Thugs)
- Cleander (Commodus's first prefect, executed)
- Fire-Breathing Horses
- Aethiopian Bulls
- Arabian Winged Serpents
- Carthaginian Serpent
- Colossus Neronis (Automaton)
- Combat Ostriches and other animals (Commodus' trained combatants)
- Livia (unwillingly)
- Triumvirate Holdings is the first antagonist group to have employed beings not strictly tied to their own mythology of origin, with the Yoruba Demigod Olujime.