Although he received no verbal answer, Cassius was no fool. The moment the question left his lips, the disparate clues in his mind locked into place. He understood. A complex emotion, a mixture of cold duty and an indescribable weight of debt, surged within his chest.
"It defies logic..." Cassius muttered to himself, his voice a ghost in the vox-link.
But he had no time to ponder the sacrificial devotion of the Skitarii. Before him lay a vast sea of xenos waiting for the Emperor's purification.
The second Executioner, though slightly smaller than the one just vaporized, was no less ferocious. Two of Cassius's fellow Terminators were locked in a desperate dance with it, barely managing to arrest the behemoth's advance through flawless teamwork and overlapping fire-support from the rear.
They all knew, however, that Thunder Hammers alone would struggle to kill a beast of such density. They were not fighting for a killing blow; they were buying time for the heavy ordinance to find its mark.
Cassius took a deep breath, forcibly suppressing the turmoil in his mind. Damage warnings flickered like dying embers at the periphery of his vision, but he ignored them.
He moved.
The Iron Rider Terminator plate unleashed a fresh burst of speed, cutting through the battlefield like a streak of emerald lightning. With the full momentum of his charge, Cassius swung his Thunder Hammer from a low crouch, slamming the power-head directly into the Executioner's right hind-leg joint.
CRACK!
The sound was muffled by the discharge of the hammer's energy field, followed by the distinct, wet snap of shattering chitin. The Executioner let out a roar of pained rage, its massive bulk tilting violently to the right as its support gave way.
"Coordinate with me! Anchor it!" Cassius's icy voice rang across the tactical channel.
"Copy that, Sergeant!"
The three Terminators shifted with practiced fluidity, forming an irregular triangle that penned the wounded Executioner in place. With Cassius drawing the beast's primary aggression, the other two circled like wolves, striking at the joints whenever the monster turned its focus. This was the standard doctrine of the Astartes—every strike, every step, and every swing formed a precise network of mutual support.
On the rear lines, the pressure remained intense, but the fire-distribution had become a masterpiece of mechanical efficiency. The Skitarii Vanguard, the Onager Dune Crawlers, and the Land Raiders functioned as a single, multi-headed organism. They began to consciously herd the surging swarm, driving the Tyranids into narrow chokepoints where the sheer density of the xenos became their own undoing.
Then, the specialized demolition units moved.
With stiff, unwavering strides, several Kataphron Breachers broke from the defensive line. They ignored the claws tearing at their treads as they rushed into the densest clusters of the swarm. Their carapaces were marked with the red sigils of the Machine God, and their chest cavities housed something far more volatile than standard explosives: Phosphex-pressurized canisters.
"For the Omnissiah!"
As the somber prayers of the Skitarii echoed, the demolition units detonated in the heart of the swarm.
WHOOMPH.
There was no deafening roar, only a low, hungry sound as the air was sucked into a vacuum and then violently expelled. A blinding, eerie blue light erupted from the center of the xenos tide. Wherever that light touched, the Hormagaunts and Termagants didn't even have time to shriek. Shell and flesh vaporized instantly at temperatures that could liquefy steel.
The "Concentrated Purification" worked. Vast swathes of the low-level Tyranid brood were erased, and several synapse-creatures leading the charge were cut down by precision fire.
The situation seemed to be turning. The siege led by the three Terminators was gaining momentum; the Executioner was a ruin of leaking ichor and cracked plates. Cassius seized his opening, ducking beneath a sweeping scythe and pivoting with his hammer.
He swung with everything the power armor could give him, aiming for the side of the monster's skull. If the blow landed, the creature's brains would be reduced to a pulp.
But just as the hammer reached the apex of its arc—
BOOM! BOOM! BOOM!
The entire Hatchery began to shake with a primal, rhythmic violence. It wasn't the tremor of an explosion, but the waking heartbeat of the earth itself. Cassius did not falter; his hammer struck the Executioner's head with surgical precision. The electromagnetic pulse severed the beast's link to the Hive Mind, and it collapsed into a heap of twitching limbs.
Cassius didn't wait to finish it. He turned his gaze toward the depths of the lair.
"Finally... it arrives," Cassius said, his heart sinking into a cold abyss. "All units! Maximum threat detected! Initiate Protocol Omega!"
As if in answer to his command, a sound like the bursting of a giant leathern lung echoed from the core. A thick, bio-chemical fog surged outward like a volcanic eruption, hissing with corrosive intent as it touched the air. Deep within the churning green mist, an unimaginably vast shadow rose.
ROAR—!!!
The sound defied description. It bypassed the vox-link and the sound-dampeners of the power armor, drilling directly into the souls of every man present. As the fog thinned, the monster's silhouette became clear.
It was a nightmare made manifest—a behemoth standing twenty meters tall. Its form was a twisted fusion of crustacean and insectoid features, covered in thick, layered plates of ominous deep purple chitin. Bone spurs and writhing tentacles guarded its massive flanks.
But its most terrifying features were the twin bio-cannons integrated into its forelimbs and the toxic spores constantly venting from the seams of its shell.
It was one of the ultimate ground-warriors of the Hive Mind, a creature of such terrifying scale that it rivaled the Titans of the Collegia Titanica.
The Tyranid Hierophant Bio-Titan had entered the fray.