Zhao Changhe had a good idea of where the forbidden land was, or at least where it might be.0

The Atlas of Mountains and Rivers clearly depicted it, located not far east of the Spirit Tribe’s sacred mountain. It was the site where the Spirit Tribe once raised the Blood Ao, the Ao Pool. The atlas even mapped out the internal paths of the Ao Pool, indicating that the Black Tortoise of the time had likely personally visited the place back in the day—perhaps due to being kin, in a sense?0

Yet, based on what Sisi and the others had said, it seemed like they had no knowledge of this Ao Pool at all.0

Given that the forbidden land appeared to have raised a Blood Ao, it was likely that they had taken over the Ao Pool, found a Blood Ao egg or something similar, and raised a new one. Whoever it was that had found the Ao Pool was clearly a god or demon from the previous era who suffered severe injuries and was barely clinging to life. To avoid being discovered by the Spirit Tribe, they likely set up some kind of barrier...0