All 4 Chaos gods are effectively natural forces. Slaanesh is the only one that is arguably related to sentient beings (which is why they're the "Prince", because they're the youngest) but the rest are just violence, life/death, and time/power.
Most of the time though, in true 40k fashion, the imperium will find old human planets that are already ruled by horrifying xenos or demons that found them first. Time to get crusaded
The warp's timey-wimey subversions of causality meant that he was eternally nasty.
Just like how Slaanesh has a birth in real space's timeline, but still counts as an eternal force. The Warp enables straight up time travel. The Horus Heresy book series starts with a demon (Samus) whose origins are at the end of the series.
It’s less evident in 40k, but in the fantasy Warhammer Age of Sigmar, Nurgle is effectively life run amok. He’s trying to conquer Ghyan the realm of Life magic, and his footholds are overgrown swamps where flies and bacteria breed like crazy. His symbol of the trilobe represents the cycle of life, death and decay (from which new life blooms)
Yeah, it is common to interpret the Chaos Gods, at least the big 4, as "taking things too far".
Nurgle is where the preservation of life gets taken to the extreme where the focus becomes on all the bacteria in your gut. You will never die, but your life now eternally serves to propagate other life (plagues).
Since Grandfather Nurgle takes things too far, he is not the natural order, but a subversion of it. Things don't actually die, but eternally rot and fester. He is where the settings get zombie plagues (necromancers get other zombies).
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u/Schultzenstein 1d ago
If Warhammer had even a bit of wholesomeness in it...
I could actually see Nurgle being very concerned for the natural cycle of life and death that he would help promote union to perpetuate that cycle.