Even though Zhou Zhou did not know the exact function of the door to the Shadow Realm,
"He" knew what the Shadow Realm was.
The Shadow Realm was actually the Shadow Realm that Extraordinary-Tier Professionals were familiar with. It was also known as the Shadow Realm.
Because all things had shadows, the Shadow Realm and the myriad worlds were connected and coexisted.
Some Extraordinary individuals who were proficient in spatial jumps could use the World of Shadows to teleport beyond distance. They called their spell Shadow Jump.
If it was a more powerful plane traveler, they could even use the Shadow World to visit any world in the myriad worlds!
Under normal circumstances, if the Shadow Realm had such a shocking effect, it could be said to be equivalent to the place that military strategists had to fight for. It would definitely be coveted by many powerful factions in reality and would want to capture it.
