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No longer were the Proelitor locked down to the realm of the Federation but dispersed across the Mechanicum. Marked officially as Legio Proelitor, a massive bureaucratic structure was being built to support the coming growth that these Transhumans.
While their Father, TalOS, had ultimate command of the Proelitors it was the Forge Worlds who now managed them and controlled them in the interim. Some of them became more successful than others at the adoption of the new militant ranks among their order. As the Proelitor, unlike standard Astartes, were accustomed with service alongside the Skitarii the new Legio was used to augment the ability of the locals.
The nerves of the Mechaincum became more tame after the distribution of these superpowered warriors within their ranks. It did not however ebb away as TalOS continued his investigation amongst the stars. Still, when a great war comes, it will be a prepared Mechanicum that shall face it.
As for the Imperium which should be coming to a Golden Age a new tragedy struck. Word came after that after less than a Decade of Service to the Imperium that the Eleventh Primarch, Tyberos, had committed a massacre of his command staff and quickly turned his Astartes against the Imperial Auxiliary that were with them.
TalOS was the first to hear the details from a late Magos L8T. Unlike Angron whose brutalist fist was not borne against mortal humans, when Tyberos was questioned by an Imperial Auxiliary General the High King killed the man outright.
Such an action would have been damaging to the Primarch’s reputation. But Tyberos did not have a cadre of Horus and when many within his fleet demanded trial he had them murdered as well. Quickly what was once a murder of mistake had blown up into a full on massacre when Tyberos demanded that his Cacaradons ‘rid him of any fool who would not listen to him’. His Astartes took his interpretation to mean that all non Astartes are to die.
In the end 87% of all mortal contingent were killed. Many of the Lucian Auxiliary were killed as the Knights of Dutonis decided it was best to challenge such a blatant evil. The Proelitor and Tech Priests, inspired by the Knights, had seconded this train of illogical thought.
Within a few months of his tyrannical regime the Wolves of Fenris had been called upon him. After several months of brutal fighting the Tyrant had been defeated. For his crimes at the forefront of the war, Tyberos was presented to the War Council for Judgement.