Beyond the three human regions and the seven demon territories, there was the Primordial World inhabited by other races.
There exists Three Human Sovereigns, Heavenly Origin Sage, North Sky Hegemon, Emperor Heavenwonder, and Seven Demon Kings, like Ao Xiao. Each of them rules his own region. The demon clan and the human clans had a half friendly half hostile relationship. Demons as a whole were more powerful than the human clans, but the humans seemed to possess more powerful cultivators. As a result, the two clans formed an odd equilibrium and the Three Sovereigns and Seven Kings agreed to a defensive pact as well as several other treaties.
The land outside their domains is ruled by the clans of other creatures. Most of these creatures were indigenous to the Spirit Realm. There were also countless types ranging from savage ancient beasts to giants and even pseudo humans. In addition, there were also other creatures that arrived at the spirit realm by ripping open spatial tears. Although there aren’t many of these clans, they were a powerful force that was hostile towards humans and demons alike.
In the Spirit Realm, the mortals are an extremely important force in the human race. Even those, who possess no spiritual roots, can learn some Buddhist cultivation arts, like the Vajra Arts, to refine their own bodies. With that they can battle cultivators and demon beasts. However, in the Spirit Realm, the postnatal acquirement of spiritual roots is possible. One of the three human sovereigns, the Heavenly Origin Sage was once an extremely prominent and renowned mortal. Only after encountering a miraculous opportunity was he able to attain a spiritual root and become a cultivator. The mortals in the Spirit Realm are only able to achieve all of this due to the fact that the spiritual Qi density in the Spirit Realm is far superior to that of Lower Realms.
Connection with other Realms
There exist reverse spirit streams and spatial nodes between the Spirit Realm and Mortal Worlds in Lower Realm. The former could only be opened by contacting someone in the Spirit Realm willing to open them. Passing through spatial nodes is dangerous, because of the spatial storms that would arise from their instability.
Normally, cultivators that ascend appear at the Spirit Flight Tower in the Deep Heaven City. Sometimes there are cultivators that encounter mishaps during their ascension, like spatial strom, and land in other areas. For those, who don't take Earth Cleansing Pills every year for 300 years to cleanse their bodies of the aura of the Lower Realm they came from, two-colored tribulation lightning appears, which is more powerful than a minor tribulation. Next tribulation comes in just 100 years.  Five generations of descendants of an ascended cultivator from the Lower Realm have the same otherworldly aura and are forced to take Earth Cleansing Pills to cleanse themselves.
Sending an avatar from Spirit Realm to Mortal Realm is very difficult. One needs a proper cultivation base, known special techniques about avatars and a rare Realm Transcending Stone is required to defy the boundary between realms. It's easier to directly teleport magic powers and attacks through the barrier between realms.
In the past, many extraordinary individuals emerged from the human and demon clans, joining together to erect an exceedingly large spell formation, covering the territories of the humans and the demons. It was powerful and was passed down from the Immortal Realm. It's purpose was to target extremely powerful members of the foreign creatures. The more powerful they were, the more they were restricted by the formation, rendering them unable to enter the areas affected by the spell formation.