Fluff is everything in the Rule book and Codices which isn't rules and isn't related to the real world. It's all the stuff put in for flavor.No army would be as cool if it were just statlines. In other words SM's could be "super human warrior with BS4 WS4 S4 Etc.", or "Defenders of Humanity who in the infinite Wisdom of the Emporer have superhuman abilities and a thirst for only War."
Fluff is what makes Nurgle disgusting, and the Tau good shooters.
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