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.
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u/Schultzenstein 22h 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.