Adult Sarcoma

The neural control system transferred Zack's commands to the massive Titan armor, and in an instant, the eight Singuilum reactors roared to life. A fraction of a second later, the suit's right hand clenched into a devastating fist and launched toward the charging Sarcoma. 

BAM! The collision sent a deafening shockwave across the battlefield. The hulking black figure of the Sarcoma was flung like a cannonball, hurtling hundreds of meters before slamming into a distant hillside.

CRASH! The impact carved a massive crater into the hillside, throwing dirt and debris high into the air. Back where Zack stood, the shockwave rippled outward, creating a hurricane-like blast that flattened every zombie within dozens of meters. Dust and smoke swirled, momentarily obscuring everything.

When the dust cleared, Zack's full form was revealed—a towering six-meter-tall metal giant clad in dark black armor that gleamed with a cold metallic sheen. The Titan was a walking fortress, powered by eight reactors, its bulky frame bristling with weapons and armor. "Ah, it feels like putting on a brand-new suit…" Zack muttered, closing his eyes and taking a deep breath. The faint, cold scent of metal and machinery sent a thrill down his spine. When he opened his eyes again, a smirk spread across his face. "Let's see how it handles," he said, raising one massive arm.

On the distant hillside, the Sarcoma clawed its way out of the crater, but before it could fully recover, a sharp crack split the air. A brilliant white flash streaked across the battlefield—a tungsten metal kinetic warhead fired from the Titan's arm-mounted railgun. Traveling at Mach 10, the projectile was a blur, visible only as a flash of light.

The Sarcoma, hit squarely in the chest, was thrown back with incredible force. A gaping hole, the size of a cannonball, was punched clean through its torso. The projectile didn't stop there. It tore through the zombies behind the Sarcoma, smashed through trees and buildings, and finally embedded itself in a tree trunk several kilometers away, setting it ablaze with the heat it carried.

The Sarcoma roared in defiance, black virus-like fibers writhing under its skin. Within seconds, the hole in its chest closed, the fibers forming a crocodile-skin-like armor across its body. "Roar—!" Its eyes, now glowing red, locked onto Zack, seething with fury.

"The target's vitality has decreased by 15%," Ego reported, its voice calm despite the lord's apparent regeneration.

"Energy conservation. Makes sense," Zack said coldly, watching the creature carefully.

The electromagnetic railgun retracted into Zack's arm as he cracked his massive fists, his heavy footfalls crushing any zombies in his path. "Let's try something new."

The Sarcoma roared again, black fibers twisting into massive, one-meter-long blades that jutted from its hands. The creature charged, its speed defying its hulking form, and swung one of the glowing black blades toward Zack. "Let's test the Rocket Punch!" Zack's voice was filled with barely-contained excitement.

"Activating elbow thrusters," Ego announced. Zack clenched his right fist, and the armor at his elbow slid open, revealing a compact Mark booster jet.

WHOOSH! 

A blazing impact beam erupted from the thruster, propelling Zack's punch with terrifying speed and force. The punch collided with the Sarcoma's blade.

BOOM! The impact sent out a massive shockwave, shattering the black blade into countless fragments. The force continued into the Sarcoma's arm, obliterating the entire limb in a bloody explosion. Bone, muscle, and virus fibers disintegrated, leaving only a shattered upper arm bone dangling from its shoulder.

The lord's massive body was launched like a missile, crashing into the ground and killing dozens of zombies as it bounced, skipping across the battlefield like a stone on water before landing in a bloody heap. "Ego, who said Rocket Punch wasn't practical?" Zack said, his tone a mix of awe and smug satisfaction as he admired the aftermath.

Even he was surprised by the sheer power of the attack. The Titan, with its six-meter-tall frame and 11-ton mass, was already a heavyweight, but the Rocket Punch had taken things to another level entirely. "The target's vitality has decreased by 39%," Ego reported, skillfully avoiding Zack's teasing.

The Sarcoma, missing an arm and battered from Zack's assault, slowly rose from the ground. This time, its red eyes held less fury and more calculation—a chillingly human-like expression of fear. "Roar…" It let out a guttural sound but didn't charge. Instead, it turned and bolted, tearing through the tide of zombies in a desperate attempt to flee.

"Smart. Even zombies are afraid of death once they gain some intelligence," Zack said coldly, watching it retreat.

Without hesitation, he activated the Titan's thrusters. The main boosters under his feet ignited alongside the secondary thrusters on his waist, back, and sides. The combined propulsion lifted the eleven-ton armor effortlessly into the sky. While it lacked speed, the Titan's rapid ascent was astonishing for its massive size. "Flight components are stable," Ego reported, monitoring the armor's performance.

"Good. Now, let's test the buffer system," Zack said, his tone filled with reckless excitement.

The armor shot up to a height of 2,000 feet before Zack abruptly shifted position. Turning headfirst, he angled the armor into a dive, plummeting straight toward the fleeing Sarcoma. "Sir, this maneuver is highly dangerous. The buffer system remains untested," Ego cautioned.

"Well, consider this the test!" Zack shouted, fists raised above his head as he hurtled toward the ground at full speed. The Sarcoma stopped abruptly, sensing the impending threat. Its body contorted as writhing black fibers emerged, forming a dense, armor-like carapace over its frame. The new layer resembled tank armor, complete with diamond-shaped patterns.

BOOM!

The collision was cataclysmic. An explosion of light and sound radiated from the impact point, followed by a shockwave that swept away all nearby zombies. When the dust cleared, a crater over ten meters wide and as deep as a basketball court scarred the battlefield. The ground around it was littered with black fragments of the Sarcoma's shell.

At the center of the crater, the Titan stood slowly, its hulking form emerging unscathed. Despite the incredible force of the impact, the armor's damage was less than 5%. Protected by two layers of advanced plating, Zack felt nothing more than a slight jolt. "Well, that works. I'm calling this move the 'Rocket Headbutt,'" Zack said, brushing debris off the armor's faceplate with a metallic hand.

"Sir, your naming conventions remain… unique," Ego replied, its tone tinged with resignation.

"Ha!" Zack chuckled, his eyes scanning the blackened fragments scattered across the ground. "Ego, any signs of life?"

"What do you think?" Ego retorted, seizing its chance to mock Zack for once.

While Zack dealt with the Sarcoma, the situation on the front lines grew dire. Without the Fearless Warriors to hold the line, Erza and the depleted mechanical army faced the full brunt of the zombie tide. Even so, Erza refused to retreat. She controlled two massive fire dragons, one rampaging through the horde to clear paths while the other coiled defensively around her and the remaining soldiers. Despite Zack's specially designed heat-resistant suit, sweat dripped from her forehead as the mental strain took its toll.

"Hey! You oversized tiger! What are you made of, steel?" Erza shouted, her voice strained as she tried to distract herself from the throbbing pain in her head.