"God" destroyed and recreated the world prior due to the sins of mankind causing one of his angels to rebel, this angel would later be known as the Lord of Chaos. The Lord of Chaos is the attempting to stop "God" from destroying humanity again by preventing humans from sinning. To meet this goal he devised a plan to unite humanity by creating the demon beasts to carry out this task. Since rebelling the creation of these creatures is what has kept humanity going, as they gather magic stones and have other uses from each one slain. In other words its an integral system of the world, the desert holds the most seals, the desert folk harvest and give magic stones to empires for oil and other resources.
Due to Buddha deporting Noya to Red Storm verse, and randomly coming across and training Yulian whom he didn't know was a chosen child, he had to immediately stop as he was tipping the fate of the world unknowingly by making him so strong. Followers of the Lord of Chaos attempt to kill Yulian throughout his warrior trial and later summon the Dragon, only for Noya to interfere as we all saw and murder it. Unfortunately a beast as strong as the Dragon affected the nearby Seals in the desert, causing a massive fluctuation weakening them and causing stronger demon beast's to spawn. This threat has become something dangerous to all in the desert and Yulian learns of this by speaking to Winnie. Since then he has sought to unite all the desert as one as a defense which brings us to now, when he is forcibly brought into the divine conspiracy of the world by Hwai Lessarche.