Spirit Realm is a world in the Middle Realm.
They are constantly 7 celestial bodies hanging in the sky. During the night, all the suns convert themselves into moons. When daytime arrives, all the moons transform themselves into scorching suns one by one. Days and nights are extremely long; roughly three times the length of the days and the nights in the Han Li's Mortal World. During the day temperatures were unbearably hot and freezing cold during the night.
Beyond the three human regions and the seven demon territories, there was the Primordial World inhabited by other races.
Divine Spirit Treasures are common in the Spirit Realm. The Chaotic Myriad Spirit Roll lists top 100 Divine Spirit Treasures. Mortals of this realm use spirit tools, which are similar to magical treasures from the Lower Realm. However, they have spirit stones embedded into them, allowing even mortals of the Spirit Realm to use them.
Ever since the inception of historical records in the Spirit Realm, there have almost been no immortals who have descended into the Spirit Realm. But in the extremely distant past, the remains of an immortal had appeared in the Spirit Realm. The Golden Jade Tome was an item that was found with those remains.
Once, Mortal Realm was invaded by Elder Devils from the Elder Devil Realm. The ancient cultivators of the Mortal Realm contacted the Spirit Realm for assistance. Individuals, like Ling Long, descended to the Mortal Realm and helped them defeat the evil forces.