"Hit that pillar harder, Rex! Your swing looks like the punch of an exhausted toddler."​Zac's voice echoed with freezing coldness, shattering the pitch-black darkness of the underground station platform. He stood entirely relaxed, his arms casually folded across his chest. Three fast-runner monsters crouched obediently right at his feet, behaving exactly like intensely loyal guard dogs.​Rex violently ground his teeth together, aggressively fighting back a terror that threatened to completely crush his chest. He swung the rusted iron pipe with absolutely all his might, smashing it fiercely against the station's concrete support pillar. The deafening, explosive clang of metal on concrete violently pierced down the dark tunnels. The echo bounced all the way up to the surface of Force City, carrying a lethal invitation to every single street predator roaming the night.​"Boss, we are going to die an incredibly pathetic death down here," Vance whispered in absolute panic, pressing his ba

​"Get on your knees right this instant, Zac. Drop your scalpel, or I will roast your sweet sister's face with hydrochloric acid."​Bryan's voice echoed loudly from the public address speakers in the corners of the bunker lobby. The giant monitor screen displayed a horrifying scene that instantly brought the blood rushing through Zac's veins to a dead stop. His little sister was tightly strapped to an iron surgical chair. A massive, transparent glass tube filled with a violently bubbling, yellowish-green liquid hovered directly above the little girl's head. Highly corrosive fumes steadily plumed from the surface of the liquid, visibly seeping through the glass cover—a terrifying indication of its lethal, highly concentrated acidity.​Zac gripped the handle of his silver scalpel so tightly his knuckles turned deathly white. The veins in his neck bulged, straining exactly like cables of solid steel. His eyes stared intensely at the screen, meticulously recording every single detail of th

​"Clamp that main artery right this second, Rex!" Zac roared, his hoarse voice shattering the panic.​Cold sweat drenched his entirely pale face. Drops of sweat fell, splashing onto his shirt, which was already sticky with crimson stains. Zac's left hand trembled violently inside the chest cavity of the female patient. His silver scalpel hovered directly over the frantically beating aorta of her heart.​"I cannot see the blood vessel, Boss!" Rex replied hysterically, gripping the medical hemostat clamp tightly with both of his trembling hands. "This filthy blood keeps pooling and completely obscuring my vision! The patient will not stop thrashing!"​"Focus your eyes entirely on the tip of my blade, you stupid mechanic!" Zac barked furiously, forcing every last ounce of his remaining strength to aggressively fight the tremor in his wrist. "Vance, aim the beam of that flashlight precisely between her ribs. Do not let a single shadow obscure my incision point."​Vance swallowed hard and

​"Shoot that creature to pieces, Executioner! Do not let it take another step closer!"​Bryan's voice shrieked in absolute panic from the communication device lying on the concrete floor. The mafia doctor had entirely lost control of his emotions upon witnessing the sudden emergence of the deadly apex predator inside the arena.​The Incinerator Executioner rotated its massive body mechanically, strictly obeying its master's absolute command. The nozzle of the flamethrower mounted on its left arm flared brightly, rapidly superheating the air inside Sector Three. A tongue of bright orange fire shot outward, violently sweeping across the floor, aiming directly for the emaciated mutant that had just decapitated the escort soldier.​The dark gray shadow vanished instantaneously. The tongue of fire only succeeded in scorching the pool of blood and the empty tiles, leaving behind nothing but a plume of thick black smoke.​The second-stage fast-runner mutant moved with a velocity that vastly

​"Tear my chest open if you are capable of it, you filthy creature!" Zac shouted, actively challenging the shadow of death hurtling aggressively toward him.​The dark gray shadow charged, violently slicing through the air of the chemical storage room. The sheer velocity of the evolved fast-runner monster generated a deafening, swirling vortex of wind. Its incredibly long, pitch-black claws, heavily saturated with pathogenic venom, aimed in a perfectly straight, lethal line directly for Zac's heart. Time inside the room seemingly ground to an absolute halt.​[Kinetic energy warning. Remaining power capacity rests at exactly one percent. Evasive maneuvers are statistically impossible. Fatal collision will occur in zero point one seconds.]​"Divert that final one percent directly into my shoulder reflexes right this instant!" Zac barked at the system inside his brain, ruthlessly forcing his absolute will upon the machine.​Zac did not take a single step backward. He deliberately leaned h