Xu Huo had not yet evolved to the point where he could create multilayered spaces in his Spiritual World. Multilayered spaces were different from simply creating multiple Book Towers. They were completely independent spaces, like a small container nested inside a large one. Someone who could enter the large container might not necessarily be able to enter the small one. Unlike location-based or container-based items, however, spaces in the Spiritual World did not have to be physical.
In other words, ordinary people could neither see nor touch spaces in the Spiritual World.
But this raised a new question: only the living could create spaces in the Spiritual World. Even if that Super Player had once hidden the entrance to the mine in his Spiritual World, his mental power should have dissipated after his death. The space could not have remained there forever.
The Han family was the only independent family in Flower City involved in the mining rights. The Origin Stones belonged to them, but that didn't mean the other companies were any more scrupulous. There had to be a reason the Han family couldn't be excluded.
Could a special item create an effect like a space in the Spiritual World?
An item that physically existed shouldn't be impossible to destroy or move.
The available information didn't explain this in any more detail.
It did mention the mining situation, though. The mines were only worked once every few years because Sub-class Stones, which could be used to make items, took time to accumulate in sufficient quantities. Almost all the mined ore was sold to other sub-districts, so it was rarely seen in Flower City or District 001. Even the ordinary ore from the mines wasn't sold on the market.
I wonder if He Pu's key came from Flower City, or