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This is a bit of an odd question, but it springs from a couple issues that have been discussed recently. So, the question:

Is there anything to show that rules in a codex apply to anything other than the army the codex belongs to?
Is there anything to show that they don't?

So, the issues that have brought up this question are these:

First, there was the thread where it was suggested that Chaos Daemons can assault the turn they deepstrike because in the Chaos Marine dex it says that daemons can. Now obviously the rule in the csm dex is meant to apply to their lesser daemons, so this was generally seen as a dumb question. However, if rules in one dex apply to armies from another then RAW says that Chaos Daemons can.

The second issue was the one of if Vulkan gives allied sisters twin linked meltas and flamers. Opinion was fairly divided on this one. The argument for it working was that it says that he makes the entire army's flamers and meltas twin linked and that sisters are part of the army and so count. I brought this issue up to a couple redshirts at my LGS and they said that it was ridiculous since rules in a codex obviously only apply to units from that codex. So when it comes to actual RAW i am wondering if anything supports what they said. If not, does that mean that if you want vulkan to make your sisters twin linked then you have to put up with daemons assaulting the turn they ds as well?

This is a logical fallacy. Cleverly done (if intentional), or serendipitous (if not). However, Upon reflection, it quickly becomes obvious that rules from a codex can extend beyond that codex. For instance, Witch Hunter/Daemonhunter Allies, to list the simplest of examples. Because the new SM codex doesn't say you can, obviously you can't ally with these forces, right? Since /my/ codex doesn't say anything about using Word In Your Ear, then your Callidus can't move my unit?

Apples and Oranges.

personally, I've always disliked the allies system, and think it creates far more headaches than it does decent, creative armies. Too many people looking to abuse it.

btw, I agree that by RAW, yes Vulkan He'stan twin-links the Sister's flamers/meltas. Now, to go buy GW a fine-toothed comb so their editors can use it on every codex and rulebook the release, so that it will be airtight for this edition and every one released afterwards.


edit: oh, and if you were to make the argument that the chaos marines codex's daemons rules affect the actual daemon player's army, you would have to abide by ALL of them. Including the rule requiring Greater Daemons to possess a sorceror/aspiring champion/etc. And, since you cannot legally field any of the above, you could never use any of the Greater Daemons. And yes, the daemon codex refers to them as "Greater Daemons". Come to think of it, if all the loyalist armies can use allies, why can't my Nurgle daemon army bring Plague Marines, or vice versa? Sad panda

If you somehow makes rules for codex demons to ally with your CSM you might have to adress this one, since they normally cant.

Apocalypse?

When using allies, me and my opponent simply ruled that rules for one army did not affect the other.

To give a simple example, If we had Tau allied with Tau (controlled by 2players) against Chaos allied with Orks.
Tau Ethereals allows all Tau units to reroll morale if they have LOS. we agreed that the Ethereal could only allow rerolls for Tau from HIS army and not his Ally Tau army.

We did this to save confusion and what can do what and to whom. Give mentioned this as food for thought and to give another example of confusion when using Allies

I disagree with you, hellsguardian.

If you're playing a partner's game, and you both have the same army, then you should be able to get in each other's transports, special abilities shared, etc.

Why? Because the biggest benefit to a doubles game is that if you take different armys, you can cover up each other's weakness.

Tau+Eldar
IG+Guard
etc.

We decided to do it the way I described so that we didn't get into arguments over rules.

For example, "how come they can use each others transports despite being two seperate Tau armies whilst my chaos lord can't hop onto his ork battlewagon? I mean, we're allies right?"

It was to also cover codex rules that said things like " models within 12" gain (insert benefit)" So that a chaos Marine didn't get the benefit to a ork banner because rules as written states that "Models" not "Ork" gain this benefit.

We just thought it made sense for a house rule that covered everyone so their would be no upset.

That being said, I do agree with you Trekari, if they are both the same race then they technically should be allowed to share their own races bonuses. But, see above for reason why we don't

I'm sure other players, like yourself, play it differently as the Rulebook does not have specific rules to cover the gap we are now discussing lol

Well to answer the original OP's question:

There are sections of some codices that have rules specifically for your opposing army... i.e. one of the hunter armies has rules for giving one of your characters a psychic power to story-drive the battle.

FAQ for Codex: DA:

"Strictly, you should always use the rules from your own codex, and this is the default solution you must use if you or your opponent can't come up with a better one."

Couldn't have said it better myself.

Hmm then where is the firepoint on a SoB rhino? it doesn't say, does that mean it can be anywhere?

The Defenestrator wrote:Come to think of it, if all the loyalist armies can use allies, why can't my Nurgle daemon army bring Plague Marines, or vice versa? Sad panda

Loyalist armies can use allies because there are rules in the DH and WH codexes that specifically allow it. There are no rules for your Nurgle daemon army to bring Plague Marines in anything beyond Apocalypse.

And that actually makes me sad. I always thought it was fluffy to have some plaguemarines running around and then seeing a Greater Demon of Nurgle plop down partway in.

The DH/WH example isn't really one codex's rules in another, is it? It's saying you can use the stuff in its own codex with SM or IG.

Well one or the other- I think Witchhunters has a section with stuff for the army facing off against the Witchhunters. For example one model gets to become a psyker for free using the special WH opposition psychic power stuff.

Cleverly done (if intentional)

Ahhh ya caught me!