But anyway I have some fluff I was writing up for my alpha legion force (WIP).
“Alpharius grew too out of touch with his origins, he was audacious, he was a fool. He struck up an alliance with horus well before I knew, we played along with his plan, till he was gone, then I saw MY legion fall apart.”
Quote from Traitor Primarch Omegon.
After the battle with the ultramarines post heresy, the alpha legion was splintered, a large majority of the brothers went fully to chaos, betraying one of their primarchs, venerating the other. These warbands remained mildly organised but non could keep their “productivity” after they left Omegon. These pirates and raiders are now what the imperium refers to as the Alpha Legion now, they have been involved in many small conflicts, from Vraks to Krieg to Kronos.
The real threat to the imperium is the faction that still calls itself ”loyal” to the imperium.. These forces led by primarch Omegon. After their destruction at the hand of the Ultramarines, this force loyal to Omegon, mainly contained human operatives, due to his direcct involvement in the infiltration part of the legion. Fewer than a thousand brothers remained, though thought to be some of the best Space marines ever to be created. This force is believed to be the first renegade group to capture an Adeptus Mechanicus cloning facility and be able to maintain a small stream of recruits to support their ranks.
For normal operations, a force of 60 space marines is assigned per theatre, these may be broken up into usually 1 high ranking captain or equivalent, 5 apothecaries (the actual function of these is disputed but believed for the augmentation of new operatives) and 44 tactical marines.
This force is supported by over 200 operatives, usually brought from a previous conflict, these are comprised of veteran guardsmen, psykers, gene-bulked shock troopers and assorted personnel.
The Alpha legion prefers to initiate control over a planet by first training up (or brainwashing) dissidents and allow them to spread like a cancer through the imperial system, disrupting supply lines, communications and most importantly imperial armed forces. The second stage extends their training to insurgent forces, who will go out and cause large amounts of destruction. The third stage is all out war, large amounts of insurgents will rise from the population, causing almost immediate destruction of the imperial system. Alpha legionnaires will then target vital command points, generatum, star ports and heavy units, usually tanks or other space marines.
So pretty much to summarise this is a post heresy alpha legion force who consider themselves as anti-imperium and anti-chaos, like the cabal intended, but with some obvious changes, their mission failed, Omegon is descending into madness at the destruction of his legion, the betrayal of his brother and his place in the universe.