Dionysius 'Dion' DeSaxe is the first son of Anthony DeSaxe, and a member of the Four Legendary Kingdoms.
Dionysius DeSaxe was born in the early 1990s to Anthony DeSaxe and an unnamed mother. He and his younger brother Zaitan became members of the Kingdom of the Underworld (which did not include their French homeland) as part of the ancient group known as the Four Legendary Kingdoms. Because of his membership in the Four Kingdoms, Dion was taught about the true history of mankind, as well as learning of the five trials set by super-ancient beings to test humanity.
As he learned more about his father's Kingdom and his heritage, Dion became disillusioned with how his father ruled the Underworld, believing that the one with the title of Hades should be more fearsome than his father.
As they grew up, Dion and Zaitan, as well as their cousin George Khalil, tormented the Minotaurs that lived in the Underworld, torturing and killing them for fun. Though their father was unaware of their cruelty, the Minotaur King, Minotus, knew that when Dion took the throne of the Underworld, the Minotaurs would be subject to far greater cruelty.
Dion attended Stanford in America, where he met the latest Oracle of Siwa, Lily West, though he did not let on that he was aware of who she was already. The pair went on a few dates, and soon Dion met Lily's adoptive father, Jak West Jr, whom Dion was also aware was the Fifth Warrior. Once again not letting on what he already knew, Dion instead greeted Jack with more familiarity than Jack would have expected (or liked).
When the the Star Chamber within the Underworld opened, allowing the nine Golden Spheres to be retrieved, Anthony alerted the other Kingdoms of the development, with the Great Games of the Hydra set to begin within the next month. As this heralded the third trial, the Diverting of the Hydra Galaxy, Dion decided that he wanted to be the one to receive the mysterious knowledge given to the King who's Champion completed the Games.
To this end, he conspired with Zaitan, who had been preparing to participate in the Great Games for years, to win the Games, and then to kill their father so that Dion would become King and recieve the Mysteries.
- Dion is named in part after the Greek God of the Vine and Wine-making, Dionysus.