Genshin Impact.

After the dawn of their immortal fate, Lin Feng and Li Er turned their hearts to the light and continued to train in the mortal world. They followed the guidance of the old man and came to a prosperous town.

The town was bustling with people coming and going, but Lin Feng was keenly aware of a hint of something unusual. Li'er also sensed the subtle change in the atmosphere around her, and she followed Lin Feng closely.

They asked around in the town, trying to find out if there were any clues related to the immortal fate. In an inn, Lin Feng learned from a mysterious guest that an ancient temple outside the city seemed to hide mysterious power.

Lin Feng and Li Er decided to go to the temple to find out. When they stepped into the temple, an old smell hit them. The statues in the temple were already mottled, but Lin Feng felt that there was a pair of eyes watching them in secret.

Li'er was a little scared, but Lin Feng held her hand tightly and gave her courage. They searched the temple carefully and found a yellowed ancient book. The ancient book recorded the legend of this temple. It is said that every full moon night, a mysterious passage will open in the underground of the temple, leading to an unknown world.

The full moon night soon arrived, and Lin Feng and Li'er stayed in the temple. When the moonlight shone on the ground, a passage leading to the underground appeared. They walked in without hesitation.

The passage was filled with mist. Lin Feng carefully cleared the way ahead, and Li'er followed closely behind. As they walked, they heard a sinister laugh.

"Haha, another person who doesn't know how to live or die has broken in." A dark shadow suddenly appeared in front of them.

Lin Feng drew his sword and prepared for battle. The shadow quickly pounced on them, and Lin Feng and the shadow started a fierce battle. Li Er watched anxiously, trying to find the shadow's flaws.

After a hard fight, Lin Feng finally found the weakness of the black shadow and defeated it. However, before they had time to catch their breath, more black shadows came from all directions.

Just when they were in a desperate situation, the old man suddenly appeared. The old man used a powerful magic to drive away the shadows one after another.

"You are too reckless. This is not a place you can just wander around in." The old man scolded.

Lin Feng and Li'er lowered their heads and realized their own recklessness.

The old man led them deeper into the passage and came to a huge cave. A strange light flickered in the cave, and there seemed to be some mysterious power hidden in the light.

Lin Feng couldn't help but want to get closer to the light, but was stopped by the old man.

"This power is too strong. You can't control it now." said the old man.

At this moment, a low roar suddenly came from the cave, and a huge monster slowly walked out from the light.

The monster was huge and exuded a terrifying aura. Lin Feng, Li'er and the old man worked closely together and fought a thrilling battle with the monster.

Lin Feng used his agility to continuously attack the monster's weaknesses. Li'er used magic to provide them with support and protection. The old man used powerful spells at the critical moment to deal a fatal blow to the monster.

After a hard battle, they finally defeated the monster. However, when they thought everything was over, they found a mysterious jade pendant dropped from the monster.

There were strange patterns engraved on the jade pendant. Lin Feng picked up the jade pendant and felt a powerful force surging in it.

"This may be the key to unlocking the secret of this place." said the old man.

They continued to explore the cave with the jade pendant and found a hidden secret room, which contained various precious magic weapons and secret books.

Lin Feng and Li'er were very excited, but the old man reminded them to stay alert.

Just as they were about to take the treasures away, a powerful barrier suddenly appeared and trapped them in a secret room.

"This is a trap!" The old man's face changed drastically.

They began to look for ways to break the barrier, and at this time, the shadows outside also noticed their predicament and gathered around them.

Can Lin Feng, Li'er and the old man successfully break the barrier and escape from the predicament? What challenges will they encounter in this mysterious underground world? Everything is still unknown...