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We also have the chapters citadel made of unknown origins, possible regressed human from dark age of technology or xeno. The chapter doesn't actually know the full size of the structure because the lower sections are locked down.
Also was thinking about the wendigowak(spelling?). Are these the brotherhoods death company? Those that have succumbed to the black rage and are simply given some weapons provisions and a homing device and left to the wilds of the planet to fend for themselves. then in times of battle a few lucky chaplains(or whatever the equivalent is) get to ride around the planet in thunder hawks rounding them all up. Also i enjoyed someone's idea that the chaplains heard them into drop pods that have some sort of food for them inside.
In the mean time the wedigowak cover themselves in their kills, claws, tusks, junk like that, while also loosing fingers and stuff to frostbite. They could also hunt the human tribes and eat and devour them, making them true to the wendigo mythology.
Don't mind me throwing science to the wall and seeing what sticks...