A STEEM MARINES Bid! Lore Challenge

+++ 07.18 hrs {Sys.Local - Anahit}
++++Ultima Seg.

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96th Lateral - Virtues of Absolution. H.City of Anahit
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The Jungles of Anahit were deadly enough to earn the planet a Deathworld rating, upon Anahit human civilization had cowered behind the thick walls of their hive cities, their scarred crete the records of countless battles against the very nature of their home. Now though, now a final battle was underway, the sky bleeding a sickly crimson as the jungles that had once encroached even to the base of the walls were gone, a seething tide of monstrosities having swallowed it whole.

Oily promethium fueled flames shot out from atop the walls, setting aflame to vast swathes of the tidal wave of horrors that slowly continued creeping up the wall, burnt carcasses becoming food for their brethren as they resumed their steady progress to the heights of the wall.

For Dios only the iron will of Father Petreus kept him moving, kept him alert and able to fight. Even now he could hear the Priest’s stern voice as it crackled over the voxbead, giving his fellow men another teaching on the Imperial Truth.
His lasrifle whined as he turned its fury on the swarm below, next to him a squad scurried about a heavy bolter, spraying its shells down with joyous abandon. Whooping and Hollering in excitement as they smashed apart their foes thick carapace to leave just shattered shell and acid blood bubbling freely.

Suddenly a shout went up, a desperate cry across the voxbead as his squad mate Pius screamed across the vox.
“Nightmares coming for us!”

Dios turned to the skys catching sight of what had caused Pius to now begin blubbering in terror as Sergeant Macrom screamed at him to pull himself together.

A vast brood of Nightmares came, the works of these foul xeno terrors, the unholy fusion of the skymares with the xeno’s they flew on vast scaled wings, strong enough to resist las fire, propelling them with insane speed through the air.
The Heavy Bolter was spinning to face them as did near most of the wall’s defenders as the vast horde approached, swooping down with deathly shrieks.

They slammed down atop the wall, amidst the desperate defenders, a few of their number had been thinned beforehand but their deceptive speed had allowed them to very quickly leave the clouds that had covered their approach and onto the walls before most had even realized properly what was happening.

The Heavy Bolter’s welcoming chatter went silent, an enormous Nightmare perching itself upon the ruined weapon, its crew scattered about it in pieces. Dios took a step back, screams echoing through the voxbead as he tried to make sense of all that was happening. His lasrifle burned, the muzzle sizzling hot to touch as he fired into the Nightmares that steadily eviscerated his squad and regiment itself. A Nightmare turned to him, its twin heads swiveling to him as they dropped both halves of Father Petreus body, the old priests face just a bubbling mess of acid.
It lunged forward-