After hesitating just for a moment, Zhu Yu instantly understood what that huge "stone block" was, and what this "underground chamber" represented.

The "stone block" was a massive stone sarcophagus, and if her guess was right, it should contain a coffin inside.

This "underground chamber" was undoubtedly the main burial chamber of a tomb.

Zhu Yu suddenly felt a bit fortunate that her past hard work sometimes led her to watch things that helped her relax, including those about excavating large tombs.

Otherwise, she might have found herself a bit bemuddled at this moment.

Lu Qing and the rune also clearly realized where they were now, their expressions showing some surprise.

Zhu Yu tiptoed around the stone sarcophagus once, her gaze continuously fixed on the junction of the sarcophagus lid and wall, observing it meticulously.

After circling halfway, she suddenly stopped and silently beckoned Lu Qing and the others.

Lu Qing, who was originally following behind, saw Zhu Yu’s signal and gently approached. Looking at the place she indicated, he noticed that the space between the lid and the wall wasn’t perfectly seamless but had a thin gap. Upon touching it, he felt fine stone powder around the gap.

If it weren’t for the fear of alerting any dangers, they would have used the flint to illuminate the underside of the sarcophagus lid, likely revealing some clear scratches.

Even Lu Qing, who considered himself well-versed in many things, couldn’t help but show surprise in his eyes.

If it hadn’t been moved back and forth many times, how could there possibly be such a conspicuous gap between the originally tight-fitting stone sarcophagus lid and its wall?

The gap and the subtle shift of the sarcophagus lid were partly due to repeated movements of the stone slab, and partly for ventilation purposes.

He had only read about depicted underground palaces and sarcophagi in books, never seen them firsthand, and never imagined someone would choose to hide within another’s sarcophagus.

This was certainly not the time for astonishment. Lu Qing quickly gathered his wits and signaled the rune, who understood immediately. As Lu Qing pulled Zhu Yu back a bit, the rune swiftly and agilely approached the stone sarcophagus, placing both hands on its lid.

Even though the rune was slimmer and more agile compared to Fu Lu, his strength was slightly inferior, but only in comparison to Fu Lu. Compared to ordinary people, he could definitely be regarded as a powerhouse worthy of admiration.

Moreover, the sarcophagus lid had been moved numerous times and wasn’t perfectly sealed, so with a well-calculated stance, the rune pushed, causing the stone slab acting as the lid to shift with a gap wider than the slit of the door above.

Without hesitation, the rune quickly leaped onto the stone sarcophagus, feet on the upper edge of the wall. Just as he was about to look inside, a coffin board suddenly flew out at him.

The rune blocked it with his hand, deflecting the board away from him. However, in the next instant, an unknown powder was thrown directly at him, hitting him squarely in the face.

He only felt a fiery sting in his eyes, leaving them hazy and unclear, causing him to tumble off the sarcophagus wall.

Lu Qing hurriedly stepped forward to catch him, preventing him from falling and getting injured.

Just then, a shadow suddenly darted out from the sarcophagus, moving so swiftly that it caught everyone off guard.

By the time Zhu Yu and Lu Qing regained their senses, they saw a shadow rushing to the opening they had come through.

It was apparent that this person was very familiar with everything here, even during such a frantic escape, he didn’t trip over the thin wire on the ground or cause the copper bell on the wall to make any sound.

"You hold onto the rune." At this moment, Lu Qing didn’t need to maintain silence any longer. He quickly instructed Zhu Yu, then chased after the shadow into the passage.

The rune, anxious and angry, was eager to chase with Lu Qing, even though his eyes were too stung to open. Zhu Yu restrained him, forcing him to sit down and immediately started rinsing his eyes with water from a small flask she pulled from her waist.

It was pitch dark here, and Zhu Yu wasn’t sure what powder had been used, but she knew washing quickly was better than delaying.

By the time almost all the water from the flask was used up, the burning pain in the rune’s eyes had subsided significantly. Assuring that he could basically see everything clearly apart from tears streaming uncontrollably, Zhu Yu finally allowed him to join her in chasing after Lu Qing.

Even though the rune claimed his vision had improved, it was still tear-blurred, and he stumbled along the way, bumping into things. Zhu Yu was only marginally better, and both struggled to pick up speed. By the time they finally returned to the entrance of the passage, where the wooden door could only open a narrow slit.

There was no wooden door there anymore, just a gap. Judging by the splintered wood, it didn’t seem like someone smashed through it but rather tore it off forcefully from outside.

As for who broke it, the answer soon appeared before Zhu Yu and the others.

"Second Young Master, we caught him, no need to worry." Fu Lu’s delighted face appeared at the door. He eagerly reported the good news to Zhu Yu and then noticed the rune beside her. "Brother, why are your eyes so red? Did that bastard use some trick on you?!"

Zhu Yu crawled through the door and walked out quickly. Lu Qing was tearing a strip of cloth from someone’s clothing, tightly tying his hands behind his back.

The person was limp and lifeless, like a ragdoll being manipulated.

"Is he still alive?" Zhu Yu couldn’t help but feel a twinge of concern seeing his state.

Fu Lu quickly assured, "Second Young Master, rest assured, while I have great strength, I know how to control it.

As soon as he charged at us, he barely touched that wooden board before I yanked and threw both him and the board away, knocking him out instantly. Then you came.

Don’t worry, I was also afraid his frail body wouldn’t withstand my punch, so after he knocked out, I didn’t finish him off."

Zhu Yu heaved a sigh of relief, patting him on the arm appreciatively, "See if there’s anything we can use for lighting, to get a good look at what this person looks like."

Fu Lu responded cheerfully and immediately began looking around.

After a quick search, there was nothing suitable for lighting. There wasn’t even enough material to cobble together a torch, let alone lamps or candles.

Finally, with no other option, Fu Lu had to pull down the boards nailed over a window, allowing some light into the small wooden building.