Legend of the Order of the Sun

Mesopotamia, a nation where only the strong survive, was a feudal realm ruled by the law of the jungle. It governed the dimension-spanning universe known as the Tianluan Realm for over fifty thousand years. More than fifty thousand years ago, Mesopotamia began dispatching the members of the Sun Knights, a force tasked with safeguarding justice and stability throughout the Tianluan Realm. Piloting gigantic humanoid weapons known as Sun Armor, they conquered the seven worlds beneath the Tianluan Realm. The brave and battle-hardened Sun Knights possessed peerless skills in combat, magic, and assassination, and were active throughout the realm. They piloted their Sun Armor through the Space Corridors, punishing criminals and protecting the innocent. Unstoppable and triumphant, they brought all seven worlds under Mesopotamia's colonial rule. Yet the seven worlds had not truly submitted. They had once been powerful, and tried to overthrow the peaceful order of the entire Tianluan Realm. When they rebelled, the knights rode aboard flying ships carrying their Sun Armor, crossing worlds through the narrow Space Corridors and launching fierce assaults as if descended from the heavens. Rebel forces and interworld raiders alike were wiped out one by one by the devastating might of these elite warriors. Then, five thousand years ago, a cataclysm known as the “World Severance” struck. The Space Corridors were sealed by the devastating destruction, cutting off all contact with the seven worlds. Mesopotamia suffered even worse damage: more than half its land was reduced to scorched earth, and countless people were killed or injured. From then on, the Sun Knights' sacred mission gradually faded from memory... Now a mysterious young man has appeared. What fate awaits him?