He is the leader of the Genesis Army OZ World. He discovered the ancient god Baroque Gun in the Valley of the Machine Soldier in Lacroa, and was fascinated by its immense power, attempting to harness the ancient god's power to revitalize the chaotic world. However, the enormous power was beyond his control, and when he learned that the ancient god's goal was to end the world and remake it his own, he rebelled.
Archaeologist Treize was in despair at a world that preached a false peace. Following an ancient legend, Treize discovered the ancient god Baroque Gun, who would become his savior, in the Valley of the Machine Soldier in Lacroa.
Traize sought to revitalize the world with the help of the ancient god. To create a more magnificent, governed world, he also needed the power of Zex.
Traize secretly recovered the wrecked Giga Tallgeese. He bestowed new power on the Tallgeese, which would bring about his future.