Deletion of Imperial Guard (Warhammer 40,000)

Comment: to Imperium (Warhammer 40,000). The question is whether this element of fiction is ''independently notable'' from the series. All of the sources, including the ones recently added above, show that the series is the covered element, of which the IG is a part. The fictional world of Warhammer 40,000 is a walled garden: lots of unsourced articles filled with |in-universe plot summary. Surely its fictional world is, comparably, more important to the series than it might be to another, but all that means is that its major fictional concepts should be covered in a list (or ideally, prose) in a set place. I suggest Fictional universe of Warhammer 40,000. If there are enough sources to split out Wikipedia:Summary style|summary style, do it from that section, but start somewhere and expand outwards—|Wikipedia is not an indiscriminate collection of in-universe summary and there are other venues for that. With the sources above, what needs to be said in an encyclopedia article for a general audience? Not more than a paragraph. Why wouldn't that fit within Imperium (Warhammer 40,000) or a different section on the game's plot? There aren't enough sources to justify this concept as independently notable from the fictional universe
Stance: merge
Cited policy: Wikipedia:Manual of Style (WP:INU||WP:INDISCRIMINATE)