Just as the group readied themselves to charge at the shadowy figure, a sudden gust of wind swept through the chamber. The air shimmered, and a figure materialized out of thin air—a tall, imposing old man with flowing white hair and a long beard that reached his waist. He wore a simple, yet elegant robe adorned with symbols that seemed to shift and change, and in his hand, he held a staff topped with a glowing, blue - crystal orb.The shadowy figure froze at the sight of the newcomer, its voice filled with a mixture of shock and anger. "You! You're supposed to be dead! How dare you interfere!"The old man let out a deep, resonant laugh. "You thought you could get away with your treachery, my old apprentice? I've been watching you from the shadows, waiting for the right moment to intervene. And now, the time has come."Chen Jiuzhang and his companions exchanged confused glances. "Who are you?" Chen Jiuzhang called out, his grip on the crystal - key still firm.The old man turned towards them, his eyes kind but filled with a hint of sadness. "I am Yun Tianhe, once the guardian of the Heart of the Realm and the mentor of this misguided soul before you." He gestured towards the shadowy figure. "Long ago, he was like a son to me, but his thirst for power corrupted him, and he betrayed everything we stood for."The shadowy figure let out a growl and raised its staff. Dark energy crackled around it as it prepared to launch an attack. "You won't stop me, old man! The Heart of the Realm will be mine, and I will use its power to reshape this world in my image!"Yun Tianhe shook his head sorrowfully. "You've lost your way, my boy. But it's not too late to turn back. Surrender now, and face the consequences of your actions."In response, the shadowy figure unleashed a massive wave of dark energy towards Yun Tianhe. But the old man merely raised his staff, and the blue - crystal orb on top glowed brightly. A shield of pure, blue light materialized, effortlessly deflecting the attack."Foolish child," Yun Tianhe said. "You've forgotten everything I taught you." With a wave of his hand, he sent a stream of energy towards the shadowy figure, knocking it off its feet.The shadowy figure scrambled to get up, its form wavering. "You think you can defeat me so easily? I have allies, and they will come for me. The Heart of the Realm is within my grasp, and nothing will stop me!"As the two powerful beings faced off, Chen Jiuzhang and his companions realized that they had been caught in the middle of an ancient feud. But they also knew that they couldn't let this distraction derail their mission. They needed to find a way to reach the Heart of the Realm and restore the balance before it was too late.Luna stepped forward, her violet eyes fixed on Yun Tianhe. "We've come a long way to reach this point. We can't let this chaos continue. Will you help us stop him and restore the balance of the Gui Xu Secret Realm?"Yun Tianhe looked at Luna, then at the rest of the group. After a moment of hesitation, he nodded. "Very well. You've shown great courage and determination. Together, we may just have a chance to save this realm from the brink of destruction."With the addition of the powerful Yun Tianhe to their side, the group prepared for the final showdown against the shadowy figure and the forces of darkness that threatened to consume the Gui Xu Secret Realm. But they knew that even with this new ally, the road ahead would be filled with danger and uncertainty.