Recall
In this vast world very few powers could claim to be truly neutral, at least ones that held any real ability. There were always sides to choose even if most people thought otherwise.
So no matter which side you were on, there were some places and things that were always out of reach because of either internal or external conflict.
But Mount Cae was one of these rare entities that didn't choose a side. Well, unless you count all things demonic in which case they were definitely against them.
Mount Cae was an ancient and ethereal worldly 'entity' that took the shape of a mountain. It did not exist as far as the general public was concerned with only a select few cultivators and persons of power being made aware of their existence.
No one knew when Mount Cae first appeared or who was the one controlling it, but as time passed it had become a natural part of the hierarchy.