For starters, I'd suggest that you try to compose that "very wip" idea into coherent sentences and paragraphs. I'm not sure what half of your writing is talking about.
Abandoning the IoM after the Heresy, with the Emperor almost dead etc. seems like a pretty selfish thing to do. Doesn't this primarch have any loyalty to the bigger picture?
Who is this "great Bear, Rouk Dragongore"?
The "Spikey read invaders" are traitor marines, right? What are the Space Wolf suddenly doing there?
A stone axe wouldn't be a very effective weapon against power armor. You'll also need to do a fair bit of explaining as to why your Xavians can have advanced weapons without any industry to make them.
While the axe-guns sound cool, they wouldn't be very practical weapons. The balance would be all wrong.
Finally, the only coherent idea that I'm seeing is the Xavians being the same kind of traitors as their primarch. I'd expect the Space Wolf to despise someone who abandoned the Imperium at it's most critical hour, just to go home. The Xavians in general would be treated similarly, with the possibility of redemption if they're willing to give up their heathen heresies and join the fight for humanitys survival.
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