It's honestly sad as hell how much Astartes NEED companions, like they're highly social creatures. They're like cows; they need a herd, they'll get depressed if you just stick one by itself in a field.
It makes them so vulnerable to manipulation.
In Unremembered Empire, John Grammaticus easily manipulates Narek, who is holding him prisoner, with "What if we were friends, don't you want a friend? Doesn't that sound nice?" and Nareks like "...ah fuck it does"
[Spoiler: it does not go well for Narek]
Or, hell, Abaddon is wildly successful in recruiting Astartes for the Black Legion because he knows just how many guys feel lost without a herd. That yearning for a battle-brother bond is so deeply hardwired into them, they'll jump to attention the second you offer it.
These poor guys.
I mean they're monsters, but still. Sad lil guys.


















