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Powerful spirits, if devoured by them, would signify a formidable boost in strength!
Many Ghost Practitioners naturally didn't want to miss out!
Therefore, they began looking for other methods!
Each universe is invisibly connected to the Netherworld, even a universe may have many spatial nodes invisibly linked to the Netherworld; however, under normal circumstances, these spatial nodes are extremely difficult to open, especially from the side of the Netherworld!
However, there is yin and yang in everything...
If a spatial node were opened, then it could be used as a reference to find another more easily opened spatial node, the two spaces corresponding and combining.
These Ghost Practitioners, this was the method they used to open this spatial node!
Earth is also located in the Immortal Origin World, actually one of the spatial nodes that is invisibly connected with the Netherworld!
This point, Er Lee might have known as well!
