"Onwards brothers, we near the hive of this alien tyrant...his reign shall be ended here and now, provided that the warp-taint of this place hath not done our job for us already." Librarian Artenius stomped forward, his midnight black power armour casting immense shadows across the dimly lit walls of the alien fortress. He casually ground an alien helmet into dust under his heel, such was his vile contempt for the creatures that once dwelt within this place of war. They had themselves to blame for their mere crime of living, and it was the eternal duty of the Space Marines to end their loathsome existence. His robes swirled in the soft currents of unnatural air that seeped from every nook and cranny in this place, filling the void with their presence and carrying the faintest traces of the souls of the lost and damned upon their howls. 

"An oath of an indomitable will to you all, brothers" The Librarian spoke before silently mouthing the words to himself. The litany of purity and protection was perhaps better serving as that of raw hatred against the confusing nature of Chaos and its servants, yet it did as it must and steeled the Librarian's mind, focusing him further on the task at hand. With an impetuous stride did the Librarian lean forth like a looming spectre of death into a blackened room. His helmeted senses made piercing the blackness that much easier, yet even now it proved difficult despite the lack of a tangible source of the corruption. 

"It will be said as before we know it so, these Tau hold no presence in the Warping heresy of chaos, yet the corruption managed to target even them? Something tells me that they held humans here, likely untrained...unskilled, psykers... Be ever vigilant, lest they become the undoing of even more of our team..." His words had suddenly become icy, his dour and melancholic tone replaced by something not dissimilar to carefully controlled fear, though he sooner laid a hand upon the Aquila on his chest than upon any material forces. 

Now far more reserved in his actions, the Librarian did set foot forwards once more, only hoping that those among his did not slay each other due to some pettiness of history, none of them knew the real pain, the sorrow, the abject misery and knowing of weakness that came from losing their primarch properly. One sat on a rock, combing his hair like a dainty model and the other sat in a mead hall drinking away his usefulness into a blind stupour. They didn't know what it was like to know deep within that their flesh was the reason they have failed in so many myriad ways and have had their honour tested like no other hath before. Sighing, Librarian Artenius simply spoke some words of proposed valour "Whatever our fates, the Imperium will rule this world once more, even if our deaths should occur and the lives of so many be lost into the void. Know it that our success does not have the fate of a world on its shoulders, for once. Take that smallest of victories away, I do suppose and we shall find that victory no longer becomes such a struggle. At least, hopefully."

Turning himself to face those three remaining squad mates that had survived, the three veterans that had seen brothers die due to alien savagery and had seen firsthand the nature of the warp. He wanted to speak, to say but a word before a twisted amalgamation of flesh was seen, floating eerily behind Brother Dominous as it was the harbinger of his demise. The Librarian watched as the creature seemed to smile, its grimaced face a contrast to the humanity it surely must of once known... Such was not the time for quandary, as Brother Dominous' now lifeless corpse planted itself breastplate first into the grating of the floor. The creature simply seemed to give a silent, malicious, laughter, the sort that had a spite which was palpable to those around.  

"Kill the mutant! Slay the heretic!" Artenius cried out to Brothers Kaerell and Moros, though even now more mutants surrounded them on all sides.