Yu Kai absorbed the mutation bead into his body, and instantly, his spiritual energy surged violently. He soared into the air, his posture swift and agile. At this moment, his strength seemed to have undergone a tremendous qualitative change. In his eyes, a gleam of confidence intertwined with a fiery desire to reach a higher realm. Those weak mutant creatures were of little value to him. Only highly evolved creatures could be the stepping stone to the pinnacle of his strength.

Like an arrow shot from a bow, he hurtled towards the city center, the wind whistling in his ears, yet he left it far behind. Huairong City, once prosperous and thriving, had long since been shattered, leaving only a horrifying mess of ruins. The streets and alleys were filled with the smell of decay and blood, tall buildings collapsed, and roads were shattered.

The entire city has become a bloody domain of mutant creatures, their roars and roars converging into a terrifying symphony of death. In the city's central square, several majestic mutant lions engaged in a fierce melee with mutant bears, mutant tigers, and mutant elephants. Their bodies were enormous, their hair bristling, their fangs flashing coldly, and every pounce and bite was fierce. Their appearance and characteristics clearly indicated that they were from a zoo, animals once kept for human viewing, now dominating the city, bringing endless despair and disaster to humanity.

"Click!" A crisp mechanical sound echoed, and Yu Kai's arms and chest were instantly covered in an indestructible layer of armor, shining brightly, as if descending from heaven. He swooped down from a high altitude, the powerful impact causing the ground to tremble. The moment he landed, his sharp eyes accurately grasped the tail of a large mutant crocodile, and suddenly exerted force, swinging it wildly. The mutant crocodile had no power to resist in his hands and was thrown dizzy. Then, Yu Kai used the crocodile as a powerful weapon, whipping the mutant creatures around him fiercely. Each swing carried a powerful force, and the mutants' skin and flesh were torn apart where they were hit, and blood splattered everywhere.

His sudden appearance instantly attracted the attention of the mutated lions and tigers fighting in the melee. They all stopped and cast their gazes at Yu Kai. Deafening roars echoed one after another, threatening to shatter the sky. The mutant lions rushed towards Yu Kai frantically, trampling the ground beneath their feet into potholes and sending clouds of dust flying.

Yu Kai faced the terrifying oncoming beast tide with a calm expression and a stern gaze. The metallic wings behind him instantly vanished, and at the same moment, the mecha's arms glowed brightly, their lines becoming increasingly rigid, as if imbued with immense power. He clutched the struggling mutant crocodile and charged towards the herd without hesitation. Two mutant lions, fangs bared and claws bared, pounced first, their momentum threatening to tear Yu Kai apart. Yu Kai, however, was agile, swung his right arm fiercely, and the mutant crocodile in his hands, like a heavy weapon, smashed into the two lions from the left and right. "Bang! Bang!" With two loud bangs, the two lions fell heavily to the ground, roaring miserably and writhing in agony, unable to rise and fight again.

Yu Kai pursued the enemy with all his might, swinging the mutant crocodile with great force, each swing bringing with it a bloody storm. The heavy body of the mutant crocodile, under his powerful strength, seemed as light as a feather.

The bodies of these mutant beasts clashed fiercely, blood splattering everywhere, staining the ground crimson. Each of Yu Kai's attacks was resolute and ruthless, his mechanical arms waving with sharp whistles. The sharp claws of the mutant lions slashed against Yu Kai's armor, and the fangs of the mutant tigers tried to bite his limbs, but he quickly dodged them or launched fierce counterattacks, instantly rendering their attacks ineffective.

Although the mutant lions, mutant tigers and mutant elephants were fearless and rushed towards Yu Kai with bared teeth, they fell down one after another in front of his powerful strength and had no power to fight back.

Yu Kai roared to the heavens, his spiritual energy radiating, illuminating his figure with a mighty and domineering presence, like an undefeated god of war. His eyes held no trace of fear or retreat, only a fiery passion for battle and an unwavering belief in victory. With each slain mutant beast, his aura grew stronger, as if on this bloody and brutal battlefield, he were the unrivaled, unstoppable god of war, master of life and death.

At that moment, an exceptionally large mutant bear roared and charged at Yu Kai. The aura of power it emanated seemed far superior to that of other mutant creatures. Yu Kai gritted his teeth and charged forward without flinching, engaging the mutant bear in a thrilling life-or-death duel.

Yu Kai's swung mutant crocodile was caught by the mutant bear's thick paw. He exerted force with both arms, hugged the mutant crocodile and pulled hard. In an instant, blood splattered, and the mutant crocodile was torn into two. Both sides dropped the mutant crocodile's body and immediately grappled with each other.

Yu Kai dodged the mutant bear's pounce with a swift, sideways movement. He raised his mechanical arm high and struck the bear's back with immense force, only causing it to stagger slightly. The bear roared, spun around, and lashed out with its massive claws. Yu Kai tapped his foot and quickly leaped back, leaving deep grooves in the ground.

"Hmph! I don't believe I can't subdue you!" Yu Kai roared, launching another fierce attack. He channeled his spiritual energy into his mechanical arm, causing it to glow brightly. He seized the opportunity, his body swift as lightning, and instantly lunged forward, striking the mutant bear in the stomach with a single punch.

The mutant bear roared even more violently in pain, counterattacking frantically. Yu Kai moved nimbly, weaving in and out of the mutant bear's attacks, his eyes fixed on its every move, searching for a flaw. Finally, Yu Kai saw his opportunity, leaped onto its back, and clamped his arms around its neck.

After a fierce, life-or-death struggle, the mutant bear's massive body finally collapsed to the ground, sending up a cloud of dust, unable to move. Yu Kai stood breathless on the devastated battlefield, his body drenched in blood and sweat, only highlighting his ferocity and dominance. The surrounding mutants were awed by his bravery and strength. For a moment, none dared to challenge him, only roaring in frustration from afar.

Just as Yu Kai took a moment to catch his breath and adjust his composure, a strange wave of energy quietly spread through the air. A dark shadow darted past at lightning speed, stirring up a gust of wind that instantly swept the mutant bead from the ground. Yu Kai's vision blurred, and the precious mutant bead vanished. Startled, he quickly glanced in the direction the shadow had vanished.