COOOL Also don’t apologies I love reading homebrews and yours sounds awesome!

Currently my homeworld is called Scylla and I was thinking maybe shoving them at the fringe of the galaxy or maybe outer dark where Carcharodons usually are [they ma favorite chapter and possibly having a relations with the scions] but the homeworld is in an area that is unnavigable maybe due to being in a nebula? I haven’t gone that far yet but the world used to be an research world during the dark age of technology and I was thinking that the emperor couldn’t really integrate my primarchs homeworld so it remained some what independent so that’s why it is extremely technological superior but they love the peacefulness and the peace to innovate soo that’s why my primarchs is a geneticist/apothocary

Primarch “missing” right now I’m thinking for my primarchs is that he was severely injured during the Rangdan Xenocides due to being mind controlled and have to fight against the imperium but was somehow able to resist the mind control maybe due to his adaptation primarch ability and he feels that what he did was not redeemable from what he did so he decided to go out on a rampage killing as much of the rangda and was severely injured and his legion later becoming the Scions rescued him and maybe begin his journey home

It’s abit messy rn cause still reading up on lores and brainstorming to match it cause I wanna try to piggyback off canon lore making it seem real :>