(Thanks to PunchedHaddock5 for the gift)
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Quyuan frowned as he remembered some things long ago. The Prehistoric World was a unique, Normal Chaos World floating in Primordial Chaos. The special aspect of it was no individual could enter, no matter who it was. People could leave the world but not enter.
Furthermore, an intense aura of taboo emanated from the Prehistoric World. Many people knew one of the 13 Taboos was inside, but no one knew what it was and why it was a taboo.
As for Myriad Devour? It was also related to the Prehistoric Word. The entire Primordial Chaos was in turmoil during the Second Origin Battle. Then, a significant World Collision occurred; many Source and Normal Chaos Worlds clashed with the Prehistoric World.
This event was an anomaly that many people believed was artificially created. However, no one cared whether that was the truth because of the benefit of this event.