Meet on the Battlefield

The people of Terrain had no idea that the World Spirit hadn't been separated into four like it would on other worlds. In Earth's case, a rare instance to be sure, the World Spirit chose its host before the Metamorphosis began. 

But, somehow, this news was kept as a complete secret. Even after years of preparation, Terrain was completely unaware. 

That said, could they be blamed? A Fourth Dimensional world with limited talent and scope like Terrain wasn't even aware that a World Spirit could make such autonomous decisions at such an early stage. 

Due to the fact they weren't aware, they weren't even looking for it before Earth's Metamorphosis began. As the saying went… you didn't know what you didn't know. How could Terrain be aware of something they weren't even aware they should be aware about in the first place?