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I believe I know the answer to these questions, but I was recently challenged by a friend, and have not been able to decern any proof that I'm incorrect in the way I'm viewing things. So all help, especially citing it, will help out immensely.

I was looking at how Chaos Daemon and CSM aura's affect each other. I was under the assumption or understanding that regardless of whether the "Daemon" keyword is under "faction keyword' or just "keyword", one the battle starts it all becomes the same. Thus the Daemonic Loci's that Heralds or such have would then apply to CSM units of Possessed, Warp Talons, Obliits, Mutilators, Defilers, Plaugeburst Crawlers, etc. Is this incorrect?

Secondly, if any of these CSM units with the MON and the Daemon Keyword destroys a unit, that would count towards Epidimeus's tally. Correct?

Lastly, the effect's of a GUO's doom bell also affects units of Possessed, Mutilators, Myphitic Blight-Haulers, etc. As above, these units are technically Nurgle Daemons once the game begins. Is that also correct?

I greatly appreciate any and all help with this. I've gotten back into things recently after a hiatus, so trying to acquire all the different books and such hasn't been the easiest of feats.

This may help, from the main rulebook FAQ

Q: What is the difference between a keyword and a
Faction keyword?
A: The only real difference is that Faction keywords are
used when building an army; when Battle-forging an
army, for instance, you will often only be able to include
units in the same detachment if they share the same
Faction keyword. Also, if you are playing a matched
play game, you will need to have an Army Faction – this
is a Faction keyword that is shared by all of the units
in your entire army (with the exception of those that are Unaligned).
Once the battle has begun, there is
no functional difference between a keyword and a
Faction keyword.

 doctortom wrote:
This may help, from the main rulebook FAQ

Q: What is the difference between a keyword and a
Faction keyword?
A: The only real difference is that Faction keywords are
used when building an army; when Battle-forging an
army, for instance, you will often only be able to include
units in the same detachment if they share the same
Faction keyword. Also, if you are playing a matched
play game, you will need to have an Army Faction – this
is a Faction keyword that is shared by all of the units
in your entire army (with the exception of those that are Unaligned).
Once the battle has begun, there is
no functional difference between a keyword and a
Faction keyword.

Thank you, this is exactly what I was thinking about. But I don't have the confidence to back myself up in a rules argument, and won't for some time.
I greatly appreciate it.

 Billie_Joe wrote:
I believe I know the answer to these questions, but I was recently challenged by a friend, and have not been able to decern any proof that I'm incorrect in the way I'm viewing things.

 Billie_Joe wrote:

I don't have the confidence to back myself up in a rules argument, and won't for some time.

The text for these abilities say that they affect DAEMON units. If there was some special ruling that said otherwise then the burden is on your friend to find it and show it to you. Failing that, there is no reason for you to believe that the regular rules do not apply. You have no responsilibilty to try to prove yourself incorrect in this situation

 Billie_Joe wrote:

Thank you, this is exactly what I was thinking about. But I don't have the confidence to back myself up in a rules argument, and won't for some time.
I greatly appreciate it.

Just keep in mind this ONLY applies to auras, not stratagems, because of Special Snowflake FAQ

WARHAMMER 40,000 CODEX: CHAOS DAEMONS Official Update Version 1.5, Page 2 wrote: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.

This is despite the fact this FAQ totally contradicts the previous one, but GW are GW.

Thank you all for not labeling me the village idiot.
Much appreciated.