In one location of Beast Conservatory deep in the jungle, where a pitch-black cave existed. Boundless streams of black mist roiled out of that cave, which was a famous place on the north bank. The Ancient Beast Chasm.
Supposedly, that cave led straight down to the Nine Serenities Underworld, and was also connected to an arcane pocket realm. Countless vicious beasts lived in the cave, sealed in place by patriarchs of the Spirit Stream Sect countless years ago. They were now a reserve force for the sect, and one of the main reasons why the north bank disciples cultivated their shamanic beast control arts.
However, the arcane pocket realm had a very mysterious origin. Throughout the 10,000 year history of the Spirit Stream Sect, only one small portion of it had been explored. Every few hundred years, the power of the seals would need to be strengthened, which required a significant cost to be paid by the sect. Even still, the vast resources within the arcane pocket realm ensured that it was one of the most important places on the north bank.
In addition to all that, the Ancient Beast Chasm was also the abode of the Spirit Stream Sect’s holy beast guardian, the Heavenhorn ink dragon. In fact, it was even part of the seal itself.