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Original lore about chaos warriors not needing sleep, eat, and drink sucks
Not even traitor legions in 40k have this.
Rather Im going insert my OC here because the way gamesworkshop went about it is FUCKING BORING.
Chaos warriors need to eat, drink, and sleep but they have stronger stomach acids which mean they can eat basically anything from plants to dead rotting carcasses on the ground, can drink from unclean water sources and handle stronger alcohols, and need less sleep. They have an improved immune system and lets just say they have some resistance to things poisonous to lesser men. Also since they eat and drink means they shit and piss too (important)