Outside one of the eighty-one openings on the ground, Zhang Tie saw the same mark he had seen outside earlier. At this moment, however, scorching flames dozens of meters high were shooting from that opening. A large circle of knights surrounded it, seemingly waiting for the right time. As soon as Zhang Tie and Bai Suxian appeared, a knight from Prince of Guangnan's Mansion who had been waiting there flew over.
"Bai Yuan'an pays his respects to Young Miss and Young Master-in-law..."
This time, Zhang Tie's relationship with Bai Suxian had been confirmed. Thus, the household knights of Prince of Guangnan's Mansion no longer addressed Zhang Tie as Thousand-Mechanism True Person, but as "Young Master-in-law"—a form of address that carried far more intimacy.
Zhang Tie had seen the knight who flew over at the banquet that day. He was indeed a household retainer of Prince of Guangnan's Mansion. Bai Suxian's Third Uncle was currently underground, and upon learning that Zhang Tie and Bai Suxian had arrived, he had specially sent a knight to wait here for them.
"Is that the passage leading underground?" Bai Suxian asked, pointing toward the place still spewing fire and surrounded by knights.
"Yes, that is precisely the passage underground!" Bai Yuan'an nodded. "People had investigated these eighty-one underground fire vents before, but no one imagined that the secret entrance to Great Wilderness Sect's Grotto-Heaven would be hidden in one of these fire vents..."
"Only one?"
"Only one. Apart from that one, even if the flames temporarily stop in the other eighty openings, charging in means certain death. Only at this entrance, when the fire stops, can one swiftly rush in. More than twenty thousand meters beneath the fire vent, there are nine branching passages. One of them is safe; all the others are dead ends.