Rise of the Otherworld.

As the crystal ball's light grew stronger, the entire room was enveloped in a strange atmosphere. The light surged like a tide, filling every corner. It was so intense and brilliant that it was almost impossible to look directly at. Lin Yu and the others nervously watched this sudden change, their hearts filled with confusion and vigilance. Their eyes stung by the light, but they still endured the discomfort, trying to find some clues from it.

In the light, some blurry images appeared faintly. Those images seemed to be separated by a layer of gauze, looming and elusive. Lin Yu tried hard to see clearly, and saw that the images seemed to show the past of this ancient castle. Ancient walls, gloomy corridors, and those who once lived and fought here.

"Is this revealing some secret to us?" Xiaoyaozi muttered to himself. His brows furrowed, his eyes fixed on the images, trying to decipher some useful information from them.

Lin Yu stared intently at the image in the light, trying to find some clues from it. The image flashed through scenes of fierce battles, with swords flashing, spells flying, and deafening shouts of killing. There were also some mysterious figures, their faces blurred, but they exuded a powerful aura.

Suddenly, the image froze on a single scene. It showed an ancient book, its runes radiating a mysterious light. Like living creatures, the runes danced across the pages, as if telling a story.

"What does this mean?" a disciple couldn't help but ask. His voice was full of curiosity and confusion, his eyes wide open, trying to make sense of this mysterious scene.

Lin Yu pondered for a moment and said, "Maybe this is the key. We have to find this book." His voice was low and firm, and he had already made a decision in his heart.

At this moment, the light began to gradually converge, like the tide receding. The strong light gradually became softer, and finally gathered into a beam of light, pointing to a corner of the room.

Following the light, they saw a hidden compartment. The edges of the compartment were engraved with complex runes, exactly the same as those they had seen before.

Lin Yu walked over carefully, every step was extremely cautious. His heartbeat was particularly clear in the silent room, as if he was nervous about the unknown that was about to come.

When he walked to the secret compartment, he took a deep breath, then slowly reached out and gently opened the secret compartment. A stale smell came to his face, and there was indeed an ancient book inside.

The book's cover was worn, its yellowed pages revealing the vicissitudes of time. The thread along its spine had snapped, as if telling of its past hardships. Lin Yu gently flipped open the pages, and the words and images on them shocked him. The words were ancient and mysterious, like a call from ancient times. The images were vivid, as if they were about to leap from the page.

"It seems to contain a powerful spell," Lin Yu said. There was a hint of surprise and awe in his voice, and his fingers gently touched the words on the page.

Just as they were about to investigate further, the room began to shake violently. Stones on the walls fell, and cracks appeared on the ground.

"Oh no, this place is going to collapse!" Xiaoyaozi shouted loudly. His face turned pale and his eyes were filled with fear.

Everyone rushed out in a hurry, their footsteps sounding chaotic and hurried in the shaking room.

Lin Yu held the ancient book tightly, dodging the falling rocks while running towards the exit.

"Everyone be careful!" he reminded his disciples loudly.

A disciple was accidentally hit on the leg by a falling stone and fell to the ground.

"Come and help me!" he cried in pain.

Lin Yu turned around without hesitation, pulled up the disciple, and continued to rush forward.

Can they successfully escape this collapsing room? And what opportunities and challenges will this mysterious book bring them? The road ahead is still full of unknowns and dangers.