Untold Chaos Series

The Untold Chaos Series takes place two years after The Last Olympian in the Percy Jackson Series and replaces the Heroes of Olympus Series, the Primordial Being Chaos briefly awakens to take shards of his power and fuses them with the knowledge and spiritual Remnants of his Grandson: Ouranos, before placing their power in six Heroes whom he chooses to conquer and rule the world alongside those Gods that side with them.

Legions of Discord

 * Theo Roberts - Theseus is the son of Zeus and the leader of the Legions of discord, his personality was described as quite similar to Zeus but colder by Percy however Nico comments that when he wants to be Theo can be as vindictive as Kronos, Theseus is actually a British Hero that was born in the same year as Percy but due to being brought up (and later hiding) in London he was out of the way of the Great Prophecy although Kronos did bring him to America during the last days of the War.
 * Klaus West - A Native American Hero and a Son of Hades, older than Nico and was raised from the dead by Hades in an attempt to create his Chosen Hero to defeat Kronos, he eventually went to ground and in the passing years has been travelling with Theseus whom he is mated with. His birth name is revealed to be Iolaus, but he hates to be called it.
 * Percy Jackson - A Hero of Olympus and one of the Six chosen adopted Children of Discord, Percy has seen that his father and Zeus are far more interested in continuing their dominion over the world and less interested in keeping to their promises, the Olympians instead go about plots to enslave Demigods to their will as Immortal Soldiers and it was this that caused Percy to quit college and go to ground.
 * Nico di Angelo -