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Chapter 375: The Mystery of the Eighth Order Formation, Helping Dao Companion Advance to Refining Emptiness_2

The difficulty had increased by more than tenfold.

Fortunately, he had the Array Heart Gu to assist him, otherwise, he would not have had the confidence to delve deeply into these high-stage formations.

"What a pity, it seems there is no information on the Cross-world Teleportation Array."

"It's also unknown if the Spirit World even has such a Cross-world Teleportation Array."

Zhou Sui felt somewhat regretful.

The formation data he most wanted was naturally that of the Cross-world Teleportation Array.

Only by successfully setting up the Cross-world Teleportation Array could he return from the Spirit World to the Profound Yellow Realm.

Unfortunately, even in the Spirit World, the Cross-world Teleportation Array was exceedingly rare, virtually unheard of.

But this was also quite normal.

For the countless clans of the Spirit World, just their own worlds were still unexplored.

How could they possibly have the spare capacity to explore other worlds?