Yu Kai rolled on the ground several times before regaining his balance. He felt a surge of blood in his chest, a sweet sensation in his throat, and nearly spit out blood. But he endured the pain and quickly stood up.

Yu Kai also took the opportunity to increase the distance between himself and the mutant lion. In this brief gap, he swallowed the light bead without hesitation. As the light bead entered his stomach, a powerful force instantly spread throughout his body.

Seeing the mutant lion rushing towards him, his eyes turned red, and he roared, leaping high into the air like a god of war, and punched the lion's head. This punch contained his endless anger and powerful spiritual power.

"Boom!" The mutant lion couldn't dodge in time, and its head exploded instantly, splattering brain matter and blood in an extremely bloody scene. Another ball of light rolled out from the shattered head. Yu Kai reached out to catch it, a hint of excitement on his face.

Yu Kai held the orb of light in his hand, emitting a chilling aura. Seeing this, the other mutants retreated in fear, not daring to take another step forward.

Yu Kai glanced at the mutant creatures around him and roared, "Come on! Who dares to come?" His voice was like thunder, echoing throughout the building.

The mutants around him were startled by his roar, their eyes filled with fear as they fled in all directions. Yu Kai sat down in the corridor, breathing heavily, his clothes soaked with sweat. Although he was exhausted, he saw a glimmer of hope in the mutants' flight.

He pulled the orb from his bosom and placed it in his mouth without hesitation. Instantly, a powerful surge of spiritual energy surged through his body, like a surging river, invigorating his exhausted body. He could clearly feel himself growing stronger! He clenched his fists, his eyes filled with fighting spirit. A trace of spiritual energy flowed through his fists, emitting a faint glow.

"I should be considered a Martial King now!" Yu Kai stared at the faint glow on his fist and fell into deep thought. "Mom and the others can use their spiritual power to transform anything, so can I also transform into a mecha? I can use the spiritual power I cultivate to build the mecha, and draw on the spiritual power hidden within me as its energy source!"

His eyes lit up at this thought, and without hesitation, he immediately began to experiment. He stood up, held his breath, and concentrated, mobilizing the spiritual energy in his body to wrap himself up, and then used all his spiritual energy to evolve the mecha according to his imagination.

Spiritual energy surged, transforming according to the Hongmeng mecha's model. First, the mecha's arms, thick and powerful, followed by the mecha's legs, stable and solid, and then the mecha's head, majestic and domineering, finally transforming into the mecha's main body. However, Yu Kai's figure swayed, and his spiritual energy was instantly exhausted. He sat down on the ground, gasping for breath, his chest heaving violently.

"Damn, it's being consumed too quickly. How can I still fight?" Yu Kai tried hard to recover his spiritual power while racking his brains to think of a solution.

"A mecha might take a lot of energy, but what about a finger?" Yu Kai's eyes lit up again, as if he had found a ray of light in the darkness. He channeled the spiritual energy he had just recovered into his right index finger, and a mechanical finger instantly took shape. Too lazy to stand up, he stabbed the tile floor with a fierce thrust. "Bang!" The tile shattered instantly, leaving a deep hole in the ground where he had poked his finger.

"Holy crap! That's amazing!" Yu Kai jumped up excitedly. He looked at the mechanical finger, then at the hole in the ground, his eyes filled with surprise. "Bang! Bang! Bang!" Yu Kai kept trying on the corridor wall and the concrete pillar. Each time he stabbed, he left a deep hole. It was practically indestructible.

"Haha! Without a mecha, I am the mecha! Once I'm strong enough, I'll transform into a full-body mecha, and my strength will increase exponentially!" He looked up at the sky, his eyes welling up. "Mom! Wait for me! I've found a way to increase my strength. Using the principles of the mecha, I can release my hidden spiritual power. I'll become incredibly powerful!" Yu Kai's tears fell from the corners of his eyes, leaving two clear marks on his cheeks.

"Mom! My son's seed is about to sprout! You must wait for me!" He shouted at the sky at the top of his lungs, his voice full of firmness and determination.

With a resounding "bang!", the sun-permeable rooftop curtain wall was ripped apart by the giant bird, sending countless shards of glass raining down from above like a torrential rain. Yu Kai hurriedly dodged to the side, only to see the giant bird let out a scream and swooped down from the sky like an arrow, its sharp beak flashing with a fierce, cold light.

"Hmph! You dare to come and die!" Yu Kai roared, his spiritual energy surging, and a metallic mecha arm instantly appeared in his right hand. "I'll let you experience the power of my mecha arm!"

Watching the rapidly approaching bird's beak, Yu Kai extended his robotic arm without hesitation, precisely grasping the incredibly sharp beak. The bird struggled mightily, its wings flapping violently, its claws like razor-sharp sickles slashing towards Yu Kai, sending a sharp gust of wind whistling. With a flick of his body, Yu Kai deftly dodged the bird's attack. Using his agility, he dragged the bird's beak toward the inner room. Yu Kai's rapid drag caused the bird to lose its balance, its massive body becoming wedged in the doorway. It flapped its wings, its sharp claws scratching grooves in the wall, sending debris flying everywhere.

Yu Kai turned around at the door and bent the giant bird's neck to one side. He leaned his back against the wall, hugged its neck tightly with both hands, pressed his feet hard against the ground, and tensed all his muscles to prevent it from breaking free.

The giant bird struggled frantically. Yu Kai's mecha arm transformed again, instantly transforming into an incredibly sharp mechanical bayonet. "Puff!" The bayonet plunged fiercely into the bird's neck. A stream of pungent, fishy blood gushed out, flowing down Yu Kai's body and staining his clothes with blood. The bird's struggles intensified. Yu Kai's face turned fierce. He gritted his teeth and held on to it with all his strength, refusing to let go no matter how hard it struggled.

After a long time, the giant bird finally stopped struggling, but Yu Kai still didn't dare let go. He had experience killing ducks before, and even if he cut their necks, the ducks would still run around. This time, he had put in so much effort, and he didn't want to let the light bead go to waste.

After a long while, once he was sure the giant bird was completely dead, he quickly smashed its skull and pulled out a dazzling orb of light. This orb was several times larger than any other he had seen before, round and smooth, and emanated even more powerful spiritual energy.

Yu Kai swallowed the orb without hesitation, instantly feeling a surge of powerful force surge through his body, his strength increasing once again. He looked at the now-dead giant bird before him and snorted coldly, "If you hadn't flown down, this narrow floor would have restricted your movements. I really wouldn't have been able to do anything to you. If you don't capitalize on your own advantages, you're simply courting death!"