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So the rules for the marks of chaos are only listed on a few characters. But they have different variations each time, and are listed no where else on the warscroll. Does marking a unit of warriors for example grant it any additional rules other than being able to benefit from command traits? If so what are they? Thanks in advance for all help.

Do you mean key words?

If so, having a mark (key word) of Nurgle would provide bonuses if they're targeted by something that says so. These bonuses would be listed on the warscroll that provides the buff (such as a GUO).

So the breath of pestilence or whatever it's named hurts non-Nurgle and boosts Nurgle units.

Sorry. I reread the rule it does say it adds keywords. Sorry my brain is still in 40k mode.