Within the depths of Arcturus a device that had been invented by two humans thrummed into life as the containment systems began to fail. Automated systems active and expelled the failing machinery into the void of space but it was too late as the device meant to compress dark matter into impossible densities ruptured. A shockwave of energy lashed outward, the very fabric of reality jolted as spacetime rippled, the immediate area around roiled and flexing as the Astral bucked and twisted under the influence. Arcturus' great shields capable of absorbing the fury of entire fleets shattered under the strain and the great city ship suffered damage to almost all areas.
Yet, this was but the herald of the coming doom as the cult of Kaiben that had been growing for decades beheld this and saw the time prophesied. Weapons forged in secret were active, plans set in motion over decades activated as the religious tension within the great city erupted into conflict. Brother against Brother, Sister against Sister as the city boiled over into war even as the Marines of the Starlight Brigade watched from the sides for their Primarch had given them no orders and they saw the actions of the people of Arcturus as imitations of their noble primarch. For he was known to be distant and at times harsh as he followed strange ideals and paths of logic, none of them could know that this was not his plan coming to fruition and so they waited watching.
Ferricus Ordius, Giovenco Ordius, and Caeso Ordius three identical triplets born only a few hours after the completion of Arcturus, none knew of any life outside its walls. They have lived their entire lives with the Song of the Astral flowing through them, they grew up surrounded by plenty and idolized Kaiben in their own way, but over the years they divided along differing lines, the preachers of the cults capturing their minds until they had grown apart and now lead the greatest of the religions of Arcturus.
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Ferricus walked through the great door as his personal Titan was revealed in all its glory, plates of astral energy meters thick proclaiming its mastery of construction and his power before his people. "Brothers and Sisters the time has come to prove our worth to the Devil Of The Stars, so that he might protect our souls for all time. To fight in his name eternally so that he might never cast us aside to find more honest servants. The misguided servants of my brothers must be brought to the light so that his eyes never wander, I hear that he has started to build a new city." The men and women before him drew a short breath as Ferricus continued in a thundering voice, "Already his eyes turn away from us, and prepares to cast us aside. We have to prove to him that we are worthy of his protection, that our Souls have value. Who marches with me to war for all?" Thunderous yells answered his question as the walls fell and revealed Worldstrider Knights waiting for their pilots and thousands of suits of armor with Void Energy Shields installed.
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In a shadowy room, lit by only a few monitors another man watched and waited, sighing slightly, "It seems that my brother has acted, prepare to begin to sabotage his forces. Ferricus will never rest and will see us all dead, for the glory of the god of time we must protect his people. For the protection of Time we must act, to ensure that the coming Ages Of Ending have the Protector at hand. We were protected by his will and so it is His will to protect others. Follow the plan and the Lord Of Time will see us successful." There were no cheers this time, merely resolute nods as people wearing shadowy robes left the room to begin their plans and plots across the city, from their actions millions would die but their deaths would ensure the God would be free to act as he saw fit. Kaiben ended Ages and Protected those within, his grace would see them successful and protect those that held true to His will.
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Deep within the Stellar Nursery surrounded by the growing stars of Astral might, Caeso opened his eyes from the meditation lasting for years and began to stand. "My brothers have lost their way among the darkness and proclaim the Living Star as a mere god and devil. Prepare the Stellar Forge, prepare the Infusion Altar, we will not let their foolishness interfere with the Celestial Plan at hand." He drifted over to a wall opening it and revealing an astartes with gleaming lines of astral energy drifting through their flesh and eyes of burning light, "The time has come my favored child, for you to fight those that dare sully the name of your Primarch." The Astartes eyes flared with fury as astral energy rippled into form revealing a suit of armor and weapons at hand, "I will fight for him gladly." He rumbled with a voice of cosmic might before leaving the room to meet with the others.