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In previous arguments, people have said that including summoned Daemons (as reinforcement points) in a force somehow could somehow disrupt a detachment being a 'Chaos Space Marine detachment' and/or a Legion detachment. Yes, this argument was brought up back when people were arguing about what exactly the rules meant by a 'World Eaters army', 'Thousand Sons army', 'Deathguard army', but the same principles theoretically apply here.

I do not see the above as being remotely true based on the RAW (and the RAI either), but I just want to see if anyone can provide insight on how, if you believe that summoning Daemons ruins the purity of a CSM detachment, the rules actually support that position.

Because looking at the rules for reinforcement points in the rulebook:

REINFORCEMENT POINTS
Sometimes a psychic power or ability will allow you to add units to your army, or replace units that have been destroyed. One of the most common examples of such an ability might allow you to summon a unit of DAEMONSto the battlefield. In a matched play game, you must set aside some of your points in order to use these units. The points you set aside are called your reinforcement points, and need to be recorded on your army roster (see below).

Each time a unit is added to an army during battle, you must first subtract the number of points the unit would cost from your pool of reinforcement points. If there are not enough points in the pool to pay for the unit, you must either decrease the size of the unit (down to the minimum unit size) or the number of upgrades until you have enough points for it, or decide not to use it after all. If you decide not to use the unit, then the ability or psychic power that allowed you to take it in the first place is still considered to have been used, even though no unit actually arrived.

It is abundantly clear to me that you are simply including reinforcement points on your roster. You are not assigning those points to specific units you're going to take (you can choose which to take when you summon the unit) and those points aren't even assigned to a specific detachment (they're just free-floating extra points).

Similarly, once you actually summon the unit, they are not part of any detachment, and therefore do not benefit from any detachment specific rules (like Despoilers of the Galaxy or any Legion Trait).

So say I were to make a 3 detachment force for a tournament army, and each detachment comprised only of Chaos Space Marine units from the Black Legion, as well as leaving a couple hundred points vacant for reinforcements. During my games if I were to summon some units of Daemons, can anyone think of any reason why someone could try to claim that the presence of the Daemons somehow disrupts my 'Despoilers of the Galaxy' or my 'Black Crusaders' legion trait? Or similarly can anyone think of any reason why someone could claim that those summoned Daemons should benefit from Despoilers of the Galaxy?

Because I think its a clear 'no' in both cases, but just wondering if there are any dissenting voices.

There is literally no legitimate reason to think otherwise.

Seems to me the summoned units live outside your detachments, don't 'break' existing ones, and don't benefit from existing detachments' bonuses.

If they did, you'd have to recalculate what people's detachments are based on reinforcements and casualties too for consistency, and that isn't a thing. So it's a double nope from me!

Yeah, that's a double no doom rider. Deamons don't get access to legion traits and don't ruin legion detachment setups when summoned into the field during game play.

I had actually vaguely remembered the argument when I saw that daemons were included in the codex, but couldn't for the life of me remember the grounds people were debating this on or what they said it was disallowing. Could anybody dredge up that thread? It might help provide context. I tried to find it but my searching got me bupkis.

I thought this was answered in the codex personally, in the same section where they go over fallen and fabulous bile (not his name I know but can't you see him acting that way?) not ruining the tactics as well.

Besides if it did that would really make word bearers kind of a dumb idea to even write as a special rule. (They are the ones who do all the summoning and deamon pacts right? Not having the codex in front of me I don't remember, I play emporers children and am the only chaos in my gaming group so it doesn't come up much)

Maybe this is a dumb question but could you use, for example, blood letters as troops in a brigade detachment for world eaters?

 Dayknight wrote:
Maybe this is a dumb question but could you use, for example, blood letters as troops in a brigade detachment for world eaters?

Can you? Of course. Should you? Well, no, because you'll lose your legion traits, since Bloodletters are not a "Chaos Space Marine unit" as per the definition on page 156

 BaconCatBug wrote:

 Dayknight wrote:
Maybe this is a dumb question but could you use, for example, blood letters as troops in a brigade detachment for world eaters?

Can you? Of course. Should you? Well, no, because you'll lose your legion traits, since Bloodletters are not a "Chaos Space Marine unit" as per the definition on page 156

Thanks for the clarity!

 BaconCatBug wrote:

 Dayknight wrote:
Maybe this is a dumb question but could you use, for example, blood letters as troops in a brigade detachment for world eaters?

Can you? Of course. Should you? Well, no, because you'll lose your legion traits, since Bloodletters are not a "Chaos Space Marine unit" as per the definition on page 156

I thought Legion traits only affected detachments. What I wanted to do is use blood letters as troops for my batallion detachment for CP. Then i have world eaters traits on my vanguard detachment of zerkers.

Fanners wrote:

 BaconCatBug wrote:

 Dayknight wrote:
Maybe this is a dumb question but could you use, for example, blood letters as troops in a brigade detachment for world eaters?

Can you? Of course. Should you? Well, no, because you'll lose your legion traits, since Bloodletters are not a "Chaos Space Marine unit" as per the definition on page 156

I thought Legion traits only affected detachments. What I wanted to do is use blood letters as troops for my batallion detachment for CP. Then i have world eaters traits on my vanguard detachment of zerkers.

Yes, that's right. But if you include Bloodletters in the Vanguard, you'll lose your traits.

 BaconCatBug wrote:

Fanners wrote:

 BaconCatBug wrote:

 Dayknight wrote:
Maybe this is a dumb question but could you use, for example, blood letters as troops in a brigade detachment for world eaters?

Can you? Of course. Should you? Well, no, because you'll lose your legion traits, since Bloodletters are not a "Chaos Space Marine unit" as per the definition on page 156

I thought Legion traits only affected detachments. What I wanted to do is use blood letters as troops for my batallion detachment for CP. Then i have world eaters traits on my vanguard detachment of zerkers.

Yes, that's right. But if you include Bloodletters in the Vanguard, you'll lose your traits.

Cool, thanks for the clear up. I really didnt want to use chaos cultist