A powerful Guardian Formation naturally had formidable protective restrictions. Jiang Yue had been mentally prepared for this, and the others had heard about it beforehand as well.
Some of the information Professor Lu Jinwen had brought back concerned the Guardian Formation, especially a few tricks regarding how it operated. They had given Jiang Yue and the others considerable inspiration.
Of course, once they truly entered the formation, everyone could still feel its solemn grandeur. Its vast aura, which connected heaven and earth, carried the heavy atmosphere of the ancient world and came crashing over them.
Without someone to lead the way, anyone who rashly entered the formation would inevitably be unable to find a clue. Given enough time, they would certainly trigger the formation's restrictions, and might ultimately find themselves on a dead-end path.
The four captives were extremely diligent when their lives were on the line. They took the initiative to explain the operating principles of the formation's restrictions, including how the safe passages changed every three minutes.
"Old Man, to be honest, if you don't have the Bizarre Tree's mark inside you, it's very difficult to clearly sense the changes in the safe passages. Relying on your eyes alone, it's nearly impossible to find the correct passage every time."
That was certainly the truth. Jiang Yue nodded.
"That's why I kept you alive. It's also where your usefulness lies."
Just as Jiang Yue had said before, even a pair of underwear or a sheet of toilet paper could be extremely useful if used in the right place.
After weaving through the formation and making several detours, they finally entered the interior of the Guardian Formation's Zhen Gate. Once inside, their vision suddenly opened up, and the scenery around them became three-dimensional as well. It was no longer gray