Suddenly, Huang Biao's sight stopped on a small island in the distance. Something seemed unusual there.

He stared closely at the small island and noticed a shimmering light on it. He hurriedly shouted: Go over and take a look! I think there are runes on it!

Everyone immediately followed Huang Biao's guidance and rushed towards the island.

When they jumped onto the island, they found a rune engraved with water ripples. It was glowing softly.

Medical officer Bian Yong took a deep breath and said: This is the second rune, which represents the power of water. We've found two, and we still need to look for the other two runes.

Everyone was refreshed and determined to continue searching. They endured the cold of the lake and searched every possible corner.

Time passed by minute by second, and everyone kept searching, looking forward to the next important discovery.

Finally, on the other side of the lake, Huang Ying found a rune with blue swirling patterns.

This is the third rune! Represents the power of wind! Huang Ying shouted excitedly.

Medical officer Bian Yong smiled broadly and said encouragingly: We only have the last rune left! Stay focused and keep looking for the next clue!

With anticipation, everyone continued to search for possible runes around the lake.

Huang Biao's eyes fell on a piece of still water. He took a closer look and found a calm stone floating on the water, motionless.

This is the last rune! Represents the power of the land! Huang Biao shouted excitedly.

Everyone gathered together to face the final challenge. They touched the runes of fire, water, wind and earth in turn.

Crack, rattle, rattle... accompanied by a harsh sound, the stone door slowly opened.

Excitement and joy of victory surged in everyone's hearts. They stepped into the stone gate and continued to explore forward.

The interior of the underground palace on the second floor is even more confusing and dangerous. Passages after passages are intertwined and intertwined, making it difficult to see even one's fingers.

We have to be careful and try not to get lost. Medical officer Bian Yong reminded everyone.

Zhu Dali clenched his weapon and looked around vigilantly, ready to deal with sudden dangers at any time.

Huang Biao was immersed in thinking, trying to find the right direction to move forward.

Suddenly, a low voice came from far away, like a ghost's call.

Who is there? come out! Huang Ying shouted loudly.

There was no response, but the deep voice became clearer and clearer.

Rumble...the ground shook, accompanied by increasingly louder sounds.

Everyone ran around in panic, but there was nowhere to hide.

There was a deafening sound of huge footsteps, and a huge underground creature rushed out of the soil.

Ouch, ouch, ouch... The underground creature made a roar that shook the earth and rushed towards everyone.

Medical officer Bian Yong hurriedly used his medical skills to strengthen the defense of everyone.

Huang Biao quickly aimed at the weak point of the underground creature, pulled the trigger, and shot a fatal blow.

Zhu Dali wielded his giant sword and fought fiercely with the underground creatures, trying to subdue them.

Everyone worked together to deal with it and tried to force the underground creatures back.

Bang bang bang The underground creatures were severely injured, roared angrily, and retreated one after another.

Everyone's efforts finally paid off, and the underground creatures no longer attacked them.

Medical officer Bian Yong said with lingering fear: Although this underground creature is powerful, it should only be part of the guardian of the underground palace. We have to be careful, there may be other more dangerous entities ahead.

Everyone nodded tacitly and continued to move forward, knowing full well that the truth was only one step away.

The rest of the journey is more tortuous and dangerous. Everyone needs to overcome traps and solve puzzles before they can move forward.

Time flows slowly in the suspenseful underground palace, and every step is a challenge.

They pass through a complicated maze, and every choice may bring a test of life and death.

This is a dead end! Huang Biao sighed.

Medical officer Bian Yong frowned slightly and said: Let me think of a way...

Zhu Dali raised his head and suddenly saw a broken stone. He picked it up and looked at it carefully. It was full of runes.

This seems to be a guide! Zhu Dali said excitedly.

Everyone gathered together to try to decipher the clues in the runes and find the right path.

After much tossing and turning, they finally found the path to their ultimate goal.

As they passed the last level, a huge courtyard appeared in front of them.

The entire courtyard is surrounded by strange-shaped trees and looks eerie. The oppressive atmosphere makes people shudder.

We finally arrived at our final destination. Huang Ying took a deep breath and spoke with determination.

Medical officer Bian Yong looked around and frowned slightly. He whispered: The atmosphere here is not right, there may be some danger lurking. We need to proceed with caution and be wary of any possible threats.

The team members nodded silently, expressing their willingness to accept the final test and challenge in order to uncover the truth about the mysterious underground palace.

Time is running out, we only have 12 hours. We have to find the answer quickly and get out of here! Huang Ying reminded everyone of the urgency of time, which increased the pressure and urgency faced by the team.

Zhu Dali felt an inexplicable uneasiness. He had a hunch that the truth hidden deep in the underground palace was not as simple as they could imagine.

He lowered his voice and said to everyone: I have an ominous feeling that we may be facing greater dangers. Everyone needs to be extra careful, unite as one, and remain highly vigilant during the remaining time.

Everyone nodded silently, realizing that this was not just an ordinary test, but also a life and death battle. They vowed to overcome many difficulties and race against time to solve the puzzle and find the answer.

Medical officer Bian Yong began to use his excellent analytical skills to analyze the structure of the underground palace, trying to find potential clues.

This underground palace has a complex structure and may hide some very important secrets. We must carefully observe every detail and look for possible hiding places. Medical officer Bian Yong frowned, thinking about his next move.

Huang Biao looked around and found a seemingly ordinary stone slab in the middle of the courtyard. He looked closer and found an ancient inscription engraved on the stone slab.

This is supposed to be a puzzle that we need to solve to learn more about the secrets of the underground palace. Huang Biao pointed to the inscription and explained to everyone.

Zhu Dali stared at the inscription and thought about it carefully. He suddenly had an inspiration.

Perhaps the answer to this puzzle lies in our past experiences. Are there any connections between the challenges and events we encountered in the first level of the underground palace? Zhu Dali was thinking.

Everyone else was lost in thought, trying to recall what happened in the first level of the underground palace and looking for clues related to this mystery.

Suddenly, Huang Ying opened her eyes wide and said excitedly: I thought of it! The challenges of the first level of the underground palace represent the power of the four elements, earth, fire, water and wind. Maybe the answer to this puzzle lies in these four elements!

Medical officer Bian Yong nodded in praise and said: That's right! And we have proven that we have the power of these four elements. Then we need to touch these four stone slabs in a certain order, which may activate the mechanism of the underground palace and give us clues to the next step.

Everyone immediately took action, touching the stone slabs of earth, fire, water and wind in the order of their previous encounters.

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