The sight before them was hell made manifest on earth.
Terra's sky had long since died, stained a sickly, roiling purple-black by endless smoke, lightning wrought from Warp energy, and the wreckage of exploding warships.
Yet at that moment, something more terrifying than that unnatural sky was the trembling of the earth.
At first, it was a low rumble, like a death knell sounding from deep within the planet's core.
Then the sound grew, becoming a continuous, eardrum-rending roar—the sound of hundreds of gigantic steel feet trampling the heart of the Imperium of Man, grinding it further into dust.
They had come.
The blasphemous wrecks of those "Divine Machines" were charging toward the Mercury Wall.
"Bzzzz."
"Hiss!"
The Titan God-Machine of the Firebee Legion—the Emperor-class Titan Blazing Inferno—was the first to announce his arrival.
After a brief charge, the plasma annihilator mounted on the massive Emperor Titan unleashed a colossal beam of blue light.
Boom!
An earth-shaking explosion erupted across the vast expanse beyond the Mercury High Wall known as the Joyful Slaughter Zone.
Successive explosions spread across the ground.
They were the chain reactions caused by the Titan "Walking Corpses" detonating after their Plasma Reactors were pierced.
"Advance! We are victory!"
Blazing Inferno's vox array gave a deafening roar.
It was deep and heavy, filled with awe-inspiring majesty.
A tremendous crackling echoed through the air.
The Hellstorm Cannon on the left arm of the second Emperor-class Titan, Exemplary, unleashed a dense barrage of beams.
Countless rays of light burst among those "steel Walking Corpses."
"Boom!" Whoooosh!
A tremendous howl of displaced air followed the explosions.
Dense Orbital Strikes rained amid the Firebee Legion's Titan phalanx.
Then they struck Exemplary's Void Shield.
Enormous bursts of fire illuminated the sky, all but obscured by gunsmoke.
"Maintain the White-Hot Flame connection.