After defeating the mysterious force, Su Yao and her family and teammates rested briefly in the dark building. At this moment, Su Yao's system emitted a strange fluctuation, seemingly guiding them to some place deep within the building.

Following the system's directions, the group carefully avoided any remaining traps and dangers. Finally, they arrived at a vast, secret chamber. The walls were covered in ancient runes and patterns, emitting a faint glow. In the center of the room was an energy sphere radiating a soft blue light; wherever the blue light touched, the surrounding darkness seemed to slowly dissipate.

Su Yao approached the energy sphere, and the system automatically scanned and analyzed it. It turned out that this was an energy sphere containing purifying power; it could purify dark energy and zombie viruses within a certain range, and might even reverse the mutations of some plants and animals.

"This could be the key to changing the world!" Su Yao said excitedly.

However, the energy sphere was protected by a powerful barrier, making its activation no easy task. Su Yao attempted to combine her special abilities with the system's power to crack the barrier's code. As she struggled to decipher it, the zombies and mutated creatures outside seemed to sense the anomaly and surged towards the dark structure.

Su Yao's parents and teammates quickly set up a defensive line at the building's entrance. Her father expanded his power shield to its maximum, forming a solid defensive line, while her mother used her healing abilities to buff everyone from behind, and at the same time directed the mutated plants to attack the approaching zombies.

Inside the secret chamber, Su Yao's forehead was covered in sweat. Her mental focus was incredibly intense, and her supernatural abilities continuously probed the protective barrier of the energy sphere. Finally, just as the zombie horde was about to breach the defenses, she successfully cracked the code.

The energy sphere instantly released a powerful purifying light, which spread outwards like a tide. Wherever it touched, the zombies let out painful howls as the virus within them was gradually purified, and their bodies began to return to normal. The ferocious aura of some mutated creatures also gradually subsided, and their previously distorted forms began to slowly return to normal.

Su Yao and the others emerged from the secret chamber, witnessing this miraculous scene. However, they also knew that this was only the beginning. The range of the purifying light was limited; to truly save the apocalypse, more sources of such power were needed.

Just then, the system notified them that other treasures or clues related to the purification energy orb might exist deep within the distant mountains. Without hesitation, Su Yao and her family, along with their teammates, decided to embark on a new journey.

On their way to the mountains, they encountered some humans who had been saved by the light of purification. These humans were filled with gratitude and awe for Su Yao and her companions, and they volunteered to join Su Yao's team to work together to save the world from the apocalypse.

As their ranks grew, they encountered new challenges in the mountains. The terrain was complex, the climate harsh, and evil forces lurked in the shadows. These forces plotted to seize control of the Purifying Light and use it to satisfy their own selfish desires.

Su Yao led her team in a fierce battle against the evil forces. Using her psychic abilities, she discerned the enemy's tactics and directed her teammates in their attacks. Her father charged into battle on the front lines, while her mother ensured everyone's safety and well-being from the rear.

At a crucial moment in the battle, Su Yao discovered the location of the evil force's energy core. She concentrated all her powers, unleashing her strongest skill, and destroyed the evil force's energy core in one fell swoop, successfully repelling the enemy.

Continuing deeper into the mountains, they finally found an ancient cave. A mysterious aura permeated the cave, and Su Yao's system indicated that it concealed a treasure of the same origin as the purification energy orb. However, the cave was also riddled with dangerous traps and powerful guardian beasts.

Su Yao and the others took a deep breath. They knew this was yet another severe test. But for the future of the apocalypse, they resolutely entered the cave, ready to face the unknown challenges and search for the treasure that might completely change the fate of the world.