I want to make khornate chapter (is it called a chapter for csm?) where each individual marine is a noble within their society, practice martial skills as an art form and appear a lot less savage.
Soooo…. How about… they were a loyal chapter after the Horus heresy and all that ended but more recently they were isolated by warp storms (the physical isolation leading to philosophical differences). The general population of their home / recruitment worlds tended towards mutation, perhaps as a result of the warp storms.
So when the storms lifted, the rest of the imperium noticed what had happened. The chapter was ordered to kill hugh swathes of their own population. The mass killing drawing the attention of Khorn but simultaneously diverting doubt away from the chapter.
When the warp storms began again the chapter a civil war between the space marines started, between those that wished to separate and those that wished to stay loyal to the imperium. Due to the support of the lower population the separatists won. It didn’t take long for Khorn worship to take over.
When the warp storms subsided again, they found that the entire solar system had resurfaced, not where it had previously stood but within the boundaries of the eye of terror.
Is there any glaring inconsistencies in that. I haven’t been reading the books so I feel that this is ok but if I come across a lore buff I don’t want to be caught with a “well, actually…”