The Prehistoric World was boundless, and although it seemed that there were only a few top-level Innate Spiritual Treasures, in reality, their numbers were frighteningly large; it's just that many of them have not been revealed to the world.
When the Pangu Great God cleaved the heavens, he killed all three thousand Chaos Demigods who came to obstruct his path. Their bodies shattered and turned into The Origin of the Chaotic World.
As for their Magic Treasures, the Chaotic Spiritual Treasures, they were scattered into the newly born Prehistoric World, transforming into various Innate Spiritual Treasures.
Even the weakest Chaotic Spiritual Treasure was no less powerful than an Innate Treasure. There were three thousand Chaos Demigods, which meant there were at least three thousand Chaotic Spiritual Treasures. After their destruction and scatter throughout the Prehistoric World, who knows how many Innate Spiritual Treasures were produced?