Vi-Ra-Nor, Sister Rachel
"To fully explain the Imperial Creed would be an extensive undertaking, due to the long millennia of history involved, but I will do my best to summarize it. In short, the gods of your world are largely benevolent... By my standards. The self-proclaimed 'Chaos Gods' of my world are not.
"Out of the chaos of the Dark Age of Technology and the Fall of the Eldar, in which mankind's mechanical servitors rebelled against them for reasons long lost and the Eldar, once-rulers of the galaxy, brought about the ascension of the fourth of the Ruinous Powers in a reality-sundering heretical orgy of indulgence, one man rose from the ashes of Holy Terra's civilizations. With His faithful companion Malcador, He conquered Terra and set his sights upon the stars, where the scattered and divided remnants of mankind's holdings lay vulnerable to the xenos, the heretic, and the predations of chaos. He would not stand by for this, and so the Great Crusade began. The Ruinous Powers scattered His sons, the Primarchs, among the stars in an attempt to stop Him, but He found them regardless, and in unity they forged the Imperium of Man. But chaos is not so easily defeated, and their lies turned half the Primarchs against the Emperor. In striking down the leader of the traitors, Horus, once the greatest and most-beloved among the Emperor's sons, the Emperor was mortally wounded and Malcador the Hero sacrificed his life.
"Now the God-Emperor sits upon his Golden Throne, unable to leave it. He projects the great beacon of the Astronomicon, giving our starships a guiding light as they travel between worlds. He sanctifies our psykers, so that they may manipulate the warp without being corrupted or destroyed by the daemons of chaos. He safeguards the souls of our fallen so that the Ruinous Powers may not claim them. He blesses our champions, that humanity might endure the predations of the countless terrors that seek to destroy us all. In our universe, there are no gods worthy of worship save Him, for all others will deceive you and devour all that is good within you, that you may serve their ruinous designs. The Imperium of Man has flaws, and in the ten thousand years since the Emperor was interred upon the Golden Throne I have come to suspect there have been unfortunate... doctrinal shifts, but it is the only reason that humanity has not gone extinct. And at its heart is the God-Emperor, for when you have faith, and act in the defense of humanity..." As Rachel speaks, her voice gets louder, faint, golden light beginning to radiate from her skin, suffusing her face with warm light.
"You will feel His blessings within you, and know that as you stand between the innocent and the daemon, the heretic, and the malevolent xenos, the God-Emperor stands beside you. And the Emperor Protects." A halo of light forms around Rachel's head, the area around her somehow appearing more solid, indefinably more real than the rest of this interstitial space. The effect slowly fades as Rachel takes a deep breath, staring down at her gauntleted hands, apparently entirely unaware of its presence. "Even in worlds so far from my own, the Emperor Protects. I know not why He sent me to this gathering of warriors, scientists, and engineers displaced from their own worlds, but He must have had a reason. I have felt His presence, but His intentions have proven... challenging to divine. Doctrine has shifted, but He has not. I can only pray that I will soon comprehend His purpose, and that I will be worthy of it, for if He had not chosen me to join this group... I would surely be by his side in spirit, and my body fodder for the foul xenos that slew the rest of my unit... and very nearly myself"