"The Shadow Wasteland World already has a unified political power."
Through the conversation with Black Terror, Muria received a lot of information, and this was one of the most important pieces. While for the people of this world, the existence of the Nine Phoenix Dynasty was common knowledge, it was particularly relevant to a Titan like Muria who aimed to become the supreme ruler of this world.
At least, this allowed Muria to know that this replica of the world he had obtained was the most difficult among all the Titans. What is the most terrifying thing in conquering the world? It's this kind of unified political regime because they can marshal all forces to attack and resist him.
Regarding this outcome, Muria did some thought. It seemed quite reasonable, after all, it was a world that had been ruled by two Titans, and during the rule of two Titans, this world was undoubtedly in a state of unity.