[Safe zone is shrinking]
Once the two hours were up, the voice of the Fire Thief echoed in the minds of every Ascendant still on Holy Grail Island.
Everyone looked into the distance at once and saw several ring-shaped black walls descend from the horizon without warning.
The black walls gradually pressed inward, and before long, the island's edges on all sides had been swallowed.
If anyone was still within that area, they would likely be swallowed by the black walls along with the island. No one wanted to find out what that would feel like.
Guan Tong had been following the bright yellow line only he could see, making his way toward Holy Grail's Secret Realm.
But when he saw where the black walls had appeared, his heart immediately sank.
According to the route marked on the ground, Holy Grail's Secret Realm lay on the western side of the island, a considerable distance from its center.
By his estimate, if the western black wall advanced another four or five times, it would likely swallow the location of Holy Grail's Secret Realm.
That meant no one would be able to obtain the Holy Grail anymore!
"The black wall advances once every two hours. In other words, if I want to get the Holy Grail, I may have only eight hours at most."
Compared to the challenge's twenty-four hours, that was a full two-thirds less time.
If that was the case, he had to deal with the threat behind him first, then reach Holy Grail's Secret Realm as quickly as possible.
Guan Tong turned to look behind him. He knew that squad was still relentlessly pursuing him.
After crossing through the town, Guan Tong had decided to find a suitable place to take them out.
A dense forest lay