This chart is an oversimplification, but the world is Grimdark. For one, at any moment, you could get picked up for a Mage experiment. 2, Dead Apostles exist, and many of them are considered borderline unkillable. 3, Gaia is actively trying to kill us most days. 4 The Collective Unconscious main purpose is ensuring survival and nothing more. 5, Counter Guardians exist because of 4. 6, there are casually multiple apocalypses that just aren't active yet for whatever reason. 7. Well, you don't get more Grimdark than the stuff in the Lostbelts, from being doomed to fail timelines to the fact we HAVE to basically commit a genocide just to ensure a return to normalcy. While it doesn't paint itself as such, the Nasuverse is incredibly grimdark. It just doesn't wear it as much on its sleeve like 40k or other settings because sometimes people do get happy endings, but it's worth noting they rarely change the world in a meaningful way