The Emperor's Favorite: The Useless and Crazy Concubine Who Conquers the World

The cave was filled with a mysterious atmosphere, and water dripped from the walls from time to time, making a dripping sound. As they walked, they came to a huge underground lake.

The water in the lake was a strange blue, and something seemed to be swimming beneath the calm surface.

Suddenly, a huge water monster jumped out of the lake. Its body was covered with scales and had long tentacles.

The water monster pounced towards Xiao Yichen and Lan Yunyan, and Xiao Yichen and Lan Yunyan immediately prepared for battle.

Xiao Yichen swung his sword at the monster's head, but the monster dodged it nimbly and spun its tentacles towards him. Xiao Yichen was entangled by the tentacles, and the monster pulled hard, dragging him into the lake.

Lan Yunyan hurriedly swung out the whip, wrapped it around Xiao Yichen's waist, and pulled it back hard.

With Lan Yunyan's help, Xiao Yichen broke free from the water monster. He took advantage of the gap when the water monster attacked again and stabbed it in the abdomen.

The lightsaber pierced the monster's abdomen, and green blood gushed out. The monster struggled in pain and dived into the lake.

Xiao Yichen and Lan Yunyan didn't dare to stop, they continued along the lakeside. There was a passage on the other side of the lake, and the passage was filled with mist.

As they walked into the passage, some vague figures appeared in the fog, like ghosts.

These ghosts let out shrill cries and floated towards Xiao Yichen and Lan Yunyan. Xiao Yichen swung his lightsaber, and the blade passed through the ghosts without causing any damage to them.

Lan Yunyan's whip was also ineffective.

"These are phantom ghosts. We have to find their entities." Xiao Yichen said.

They searched carefully in the fog and found some crystals on the wall, which seemed to contain ghost entities.

Xiao Yichen and Lan Yunyan began to attack the crystals. Every time a crystal was broken, the corresponding ghost would disappear.

After some effort, they finally cleared all the ghosts and passed through the passage.

At the end of the passage was a huge stone door, engraved with ancient runes. Xiao Yichen and Lan Yunyan approached the stone door and felt a powerful force coming from it.

They didn't know what was behind the stone gate, but they knew that only by moving forward could they escape this endless danger.

The two exchanged glances, then simultaneously reached out and pushed the stone door. It slowly opened, a dazzling light streaming in from behind. They narrowed their eyes and stepped into an unknown world.

The stone door slowly opened as they pushed it, and the dazzling light pierced their eyes like a sharp sword.

When the light gradually dissipated, Xiao Yichen and Lan Yunyan could see the scene clearly.

This is a vast space with huge glowing spheres suspended in the sky, emitting soft light that illuminates the entire world.

There was a seemingly soft grass under my feet, but if you looked closely, you could see that there were tiny spikes on the grass leaves, flashing a strange cold light.

In the distance, an ancient castle was looming. The walls of the castle were covered with vines, which seemed to be alive, slowly crawling on the walls.

The castle gate was closed tightly, and a huge gem was inlaid on the door. There seemed to be light and shadow changing in the gem, as if telling the mysterious history of the castle.

Xiao Yichen and Lan Yunyan walked forward cautiously. They could feel slight vibrations under their feet with every step, as if there was some huge creature hidden beneath the earth.

Suddenly, the surrounding grass began to shake violently, and the thorny grass seemed to have received some kind of command and shot towards them.

Xiao Yichen swung his lightsaber, the blade creating a flash of light and shadow, slicing through the incoming thorny grass. Lan Yunyan used her long whip to form a protective circle around her, keeping the remaining thorny grass out.

However, the thorny grass grew more and more, as if it were endless.

"This is not a solution. We have to find a way to leave this grassland." Xiao Yichen shouted loudly.

Lan Yunyan looked around and found a clearing not far away that was devoid of thorny grass. "Over there, let's go that way!" she shouted.

While fending off the attacks of the thorn grass, the two ran towards the clearing. Finally, they set foot on the clearing. The thorn grass stopped attacking at the edge of the clearing, as if blocked by an invisible force.

"It seems there's something strange here." Xiao Yichen squatted down and looked carefully at the ground. He found some strange symbols on the ground in the open space. These symbols emitted a faint light, which seemed to be an ancient formation.

"These symbols may be the key to stopping the thorny grass. Maybe we can use them to find a way through this grass." Xiao Yichen said.

They began to study these symbols, trying to decipher the mystery. After some effort, Xiao Yichen discovered that these symbols were somehow connected to the glowing sphere suspended in the sky.

As he pointed at the glowing orbs in a specific order, the spiky grass surrounding the clearing began to wither.

"Let's go! Now is the time." Xiao Yichen and Lan Yunyan quickly ran towards the castle.

As they approached the castle, the castle gate slowly opened, and a strong airflow rushed out from the gate, carrying a smell of old and decay.

They entered the castle, and the gates slammed shut behind them.

The castle's hall was very spacious, with huge statues placed around it. These statues were all unknown creatures, some with wings, some with multiple heads and arms, and their eyes were all fixed on a fountain in the center of the hall.

The water in the fountain was black and had a pungent smell. There were some strange objects floating on the water, like offerings for some ritual.

Suddenly, the statues began to move. The winged statues flew into the sky and swooped down towards Xiao Yichen and Lan Yunyan. The flapping of their wings created a powerful airflow that made it difficult for them to stand.

Xiao Yichen and Lan Yunyan quickly separated to avoid the attack.

Xiao Yichen swung his sword at a swooping statue, and the lightsaber collided with the statue's wings, splashing a string of sparks.

The statue roared, changed direction, and rushed towards him again. Lan Yunyan wrapped her whip around the leg of one of the statues and pulled hard, knocking it to the ground.