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I don't know if this was posted before couldn't find it this specific. But i'm confused about the FAQ and things i see in lists and recent games.

The question is about which things in from the nurgle daemons rules in the chaos daemons codex apply to death guard.
For example the FAQ states that:

''Q: When a Stratagem from Codex: Chaos Daemons uses
the Daemon keyword, can it be used to affect any unit with
the Daemon keyword, or only units with the Daemon
Faction keyword?
A: These Stratagems can only affect units with the
Daemon Faction keyword.''

Note that they only talk about stratagems. I get that, for example, using the denizens of the warp which allows a deepstrike used on mortarion who has the Nurgle FACTION KEYWORD and the Daemon KEYWORD is NOT allowed.

But in the same context i've seen the Virulent blessing psychic ability used on mortarion before, again which is only applied to Nurgle Daemons.
Another example is the usage of Feculant gnarlmaws aura ability which allows Nurgle Daemons to fall back and shoot used on plagueburst crawlers, which again have the Nurgle Faction KEYWORD and the Daemon KEYWORD.

My question is are stratagems the only rule NOT to be applicable on Death guard units? Do Daemonic Loci work on deathguard units with the daemon keyword?(as long as I have everything in a Nurgle themed detachment ofcourse)

Please let me know what you think! I am trying to build something around the Myphitic blighthaulers and the usage of the Great Unclean One's ability Reverberating Summons to make a near immortal highspeed set of deathguard vehicles. which can be healed by Fleshy abundance psychic spell, while being able to fall back and shoot in the aura of the Feculant gnarlmaw. (to push it to the extreme)

It's a Special Snowflake FAQ applies to Daemon (and Tyranids) stratagems only. All other rules follow the RaW (and Rules as FAQed in the Designers Commentary). That means Powers, Auras etc all follow the normal rules.

As BCB said, that limit is only for stratagems. All other things that target or affect "nurgle daemons" can also target Foetid Bloat-Drones, Myphitic Blight-Haulers, Plagueburst Crawlers, Defilers, Mortarion, Possessed and Daemon Princes of Nurgle from the DG codex.

For example, you can resurrect Blight-Haulers with a Great Unlcean One's bell, but you cannot have them deep strike via stratagem.