His pupils constricted, his gaze blazing like lightning, each glance like a sharp blade, piercing straight at the zombies he hated to the core. It was a hatred that ran deep into his bones, a determination that would not give up until his goal was achieved.

There was no trace of pity or hesitation in his eyes, only endless murderous intent. He seemed to be declaring to these zombies: Today is your end. I will wipe you out without a single one left, to avenge the pain I have suffered in the past.

The burning rage distorted his expression, but also made him more determined and courageous. He would use his own hands and the long sword in his hand to completely wipe out these monsters that had brought him endless nightmares from this world.

After a fierce fight, a pile of zombie corpses fell around Xiao Yi. He gasped, his eyes inadvertently sweeping over the zombie heads on the ground.

Suddenly, he noticed something strange inside one of the zombies' heads. He took a closer look and saw it was a crystal core emitting a faint glow. Though faint, the light was striking in the dim surroundings.

Xiao Yi's eyes lit up, and surprise instantly filled his heart. He quickly checked the heads of other zombies and found several similar crystal cores. These crystal cores varied in size and shape, but all emitted a mysterious and soft light.

He carefully removed the crystal core from the zombie's head, held it in his palm, and examined it carefully. The light of the crystal core reflected on his sweat- and blood-stained face, making him feel an unprecedented hope.

Xiao Yi recalled his own superpowers and the difficult process of improving them, and suddenly had a bold guess in his mind. He realized that these crystal cores might be the key to improving his superpowers.

This discovery made him extremely excited, and his heartbeat quickened. He seemed to see his superpowers growing stronger and stronger, and he could more calmly deal with this dangerous world.

Xiao Yi gripped the crystal core tightly, his eyes filled with anticipation and determination. He knew this might be the turning point in his fate, the light of hope for his survival and strength in this apocalyptic world.

Xiao Yi squatted down, carefully manipulating the long knife in the zombie's head. His movements were gentle and precise, for fear of accidentally damaging the precious crystal core.

He first used the tip of his knife to gently slice through the rotting flesh on the zombie's skull, then carefully avoided the disgusting pus and broken bones, inching closer to the crystal core. When the tip of the knife touched the edge of the crystal core, his breathing became shallow, and his eyes were focused and tense.

Then, he gently pried the crystal core, slowly separating it from the surrounding tissue. Every subtle movement was filled with care, as if he were handling a priceless treasure.