Thoron, king of the dragons, made Xenoz to become the ambassador of the two armies of the Draigar and Norvagen and was given the power to become immortal. Later Xenoz conspired with the evil dragon Stendhal and slew the dragon queen and took her ice Krystal. Thoron later arrived and saw the dead body of his queen and burned and deformed the face of Xenoz.
Thoron, with all his power, imprisoned Stendhal for 1000 years. Xenoz then allied with the Vorgan forming the Ice Vorgan. Xenoz made an evil plan, it was to slay all the dragons and feed them to his Vorgan, in doing so the Draigar and Norvagen fought with each other. Not for the Krystals but they thought that the other had been killing the dragons.
Xenoz was immortal, but he could not heal. He wore a white mask at all times to hide his face, which was horribly disfigured due to his immense age. When he kidnapped the Norvagen prince and Draigar princess, he unwillingly united the Draigar and Norvagen into the Fyren, who then besieged his castle of Dragon Mountain, ending in his teleportation to the Dragon World where he was brought to justice by the dragon king Thoron and his kingdom.
Afterwards, Xenoz became the leader of a small group called the Xenoz Clerics.
In the Fire And Ice movie, Xenoz has a red face but in his mini-figure he has a blue face.