The Divide is a powerful barrier, said to be created through the use of a warrior's ability. This ability separated the monster and human worlds, and ended the never ending war between the two races. The amount of effort required to make this barrier is said to have killed the warrior in the end. Despite the fact that it has proven impervious to any and all means of getting through it, Aria has mentioned that there are rumors of secret passages cropping up, as the barrier gets thinner and thinner with age. (This is mentioned on Page 368.)

The barrier, as seen from up close.

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