tactical squads south of the highway onto the roofs of the warehouses where they could be covered by the devastators of Therotius. Corilinus and his assault squad moved quickly up to the raised highway, their jump packs flaring in the dim light as they bounded up the slope. From there they would be able to cross easily to the roofs of the lower buildings to the north and south, in response to the tyranid attack.
Satisfied that all was well, Cassius recited a liturgy of battle over the vox, preparing his warriors mentally for the fight to come. As he spoke the words of the second verse, a distinctive crack announced the firing of the Thunderhawk's main cannon. Directing his attention to the harridans, he judged the tyranids to be less than two kilometres away. Lascannon flashes seared across the grey skies as the Ultramarines targeted the lead beast, the pulses of white energy punching through the creature's immense leathery wings. Losing height, the wounded harridan turned sharply, dropping towards the ground. The Thunderhawk circled and fired again, this time striking the harridan in its rear quarters with a battle-cannon shell. Flesh and chitin rained down from the exploding wound, causing the harridan to contort madly, its wings spasming.
A flutter of smaller shapes spread from the beast's belly, scattering in the high altitude winds as the gargoyles detached from the mortally wounded harridan. Some were swept away immediately, disappearing into the clouds; the rest spiralled quickly groundwards, eventually gathering into a coherent mass as they descended into lighter winds.
The other two harridans were stooping into long dives, readying to disgorge their own living cargoes onto Cordus Via. The whine of power cells charging drifted across the rooftop from the devastators as Cassius finished the third verse of the litany and raised his crozius above his head, the gilded tyranid skull at its tip glowing from the power field generator concealed within. The tyranids were less than a kilometre away, swooping swiftly towards the rooftops.
'Let forth your righteous anger in the name of the Emperor!' bellowed Cassius.
Just as the words left his lips, the vox chimed in his ear, signalling a communication from Princeps Perthion.
'Revered Chaplain, sensor reports show excess of three thousand enemy heading our way,' said the Titan commander. 'Distance of two kilometres. We will destroy as many as we can, but we cannot guarantee total extermination.'
'Understood, princeps,' replied Cassius.
Two missiles streaked skywards from the launchers of Squad Xathian. Their contrails cut a converging path towards the closest of the two harridans. The beast's wings had ceased beating as it glided down on its attack course. At this range, Cassius could see the multitude of smaller creatures grappled to its underside: a swathe of quivering pale flesh and dark red chitin plates. As the missiles veered towards the harridan, the gargoyles stirred into life. Spreading bat-like wings, they dropped from the larger beast's underside in a cloud, scattering from the path of the incoming projectiles.
Both missiles struck the armoured head of the harridan, cracking thick chitinous plates and sending organic shrapnel flying but doing little real damage. Divested of its brood, the harridan plunged onwards. Cannon-like growths at the crooks of its wings spat forth a volley of living ammunition. As dark blurs, the projectiles flew towards Xathian's squad; Cassius watched their trajectory as the large slug-like bio-shells dipped across the highway.
Hitting the tops of the storage vats, the bio-cannon volley exploded with a cloud of organic acid, spraying several of the Space Marines with highly corrosive slime and razor-edged chitin shrapnel. Ceramite cracked and melted, the bio-acid searing through the armoured layers of the devastators pauldrons and chestplates.
There was no time to consider potential casualties: the gargoyles from both harridans were
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