Forge the narrative campaign #1

Me and my gaming group have undergone the start of an escalation campaign which will result in an apocalypse game in a couple of months.
The premise of this campaign is narrative driven, and will start with small point skirmishes and development natural as we unfold the story being told.
The players involved in this campaign are:
- Me with the sons of anubis (chaos space marines, deamons and dark mechanicus)
- alpha legion, a 30k force
- deathwatch, space marines
- blood angels
- sons of Ananta, custom space marine chapter
So for starters here is the set up:

An old factorum system that disappeared during old night is rumoured to have been spat out the eye of terror. This system believed to be desolate, and also containing many of the secrets of the technology from before the old night. These technologies are of the greatest importance to the imperium to retrieve and reverse engineer thier secrets.
But little do they know the forge world in the system is Acctually the forgeworld for the dark magos Ma'Ta (see http://dicerollingdad.blogspot.co.uk/2015/12/sons-of-anubis-dark-mechanicus.html?m=1)
And the system that reappeared was the home to the shattered remnants of the 2nd legion, 'the sons of anubis' (see http://dicerollingdad.blogspot.co.uk/2015/12/the-sons-of-anubis-backstory.html?m=1)

Sons of Ananta Marines:
 And during their sojourn in the warp on their ill fated mission, the Sons of Ananta, before they were the Sons, caught strange emanations.

2 factions emerged in the new chapter. One wished to gain favour with their mechanicus allies (recently gained from the campaign I'm having with Alex) and others wished to tell the inquisition to mitigate the suspicion caused by the new chapter protecting members of the Knights Amaranthine...


Alpha:
 Secrets. There are secrets here, and secrets are power. We know rumours of what is concealed here, so we go to claim it, to further the ultimate plan, for the emperor. Hydra dominatus. Amass the Harrowing.