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Wrath of Magnus added some loci to Tzeentch, and here's the text of how they interact:
"If a unit contains two or more loci, only the strongest takes effect--the rules for the others are ignored whilst there is a stronger locus in the unit.... If there are two loci of the same tier, you choose which applies."

Imagine I have two Tzeralds in a unit of Horrors. The Tzeralds have Exalted Locus of Conjuration (psychic power hits are +1S) and Exalted Locus of Creation (2x models created for Split).
Are each of these bonuses essentially on all the time? I can choose to use Conjuration exclusively in the Psychic Phase and Creation at all other times, right? So I would get 2x models for all casualties except for Perils (and maybe even then, if I switch back and forth constantly).
When do I make the choice of which applies? It seems that start of player turn or start of phase would be the most sensible place to do it. The Greater Loci have mechanisms that trigger at start of player turn.

When you decide to use which one?
Is it per phase? Start of turn?

Not familiar with the text for these.



Automatically Appended Next Post:
Ok so I read the page.

As you said it states ""If a unit contains two or more loci, only the strongest takes effect..."

I would infer that the decision to make a choice, happens when there is a conflict about which one is the "strongest" so if you have a unit with 1 in it and another joins, you would have to choose which one is the "strongest". I don't see you being given an option to have the flexiblity to switch between them because you are forced to make the choice whenever there is at least 2 of them in a unit and you would have to decide when one joined.

The only way you would be able to change it would be if you had a third one join, have see that there are "two or more loci" allowing you pick which one was the "strongest" again.

Thats how I read it anyway.

I don't have the book so take what I'm about to say with a good dose of salt, but I'd argue that with two loci of the same tier, you decide which is the strongest in the same spirit that you decide which save is the best. You have multiple saves all the time, but only one applies at any given time, the same principle works here. From the quote you gave it could read two ways to me. Either choose when you join (and it remains chosen) or choose which to apply at any given time.

Though the two examples you gave make me believe RAI is more that you choose which one is up while joined and leave it at that, otherwise choosing for each event would be the same as just having both up all the time.
But again, no book, nor experience with daemons, so I'm talking out of my ass here.

""for the others are ignored whilst there is a stronger locus in the unit""

That is the key part, once you have two in a unit and you have chosen one, the second one is considered subservient.(ignored)

Because you chose one "at any point" and deemed the others in the unit as subservient, you don't have the option to choose again unless the circumstances requiring you to choose are triggered again.

The only way to have two or more in a unit again is to either have a 3rd one join, so you are presented the choice again, or have one leave and come back. If you have two of the same status you are simply choosing which one is the "strongest".

It's the strongest loci at all times until slain, if two loci of the same level are in a unit you choose at the beginning of game.

 Rolsheen wrote:
It's the strongest loci at all times until slain, if two loci of the same level are in a unit you choose at the beginning of game.

..............annnnd what happens when my two Tzeralds leave their original unit and join a new unit on T2? It's not the beginning of the game....

How is anyone getting any sort of rationale for WHEN the choice is made? Any rules support at all, please?
Both Greater Loci reference beginning of (player) turn, so that would prolly make the most sense, right?

You have a triggering effect.

"If a unit contains two or more loci"

So at ANY POINT IN TIME, there are two or more you must choose...

"If there are two loci of the same tier, you choose which applies"

Once you have chosen...

"only the strongest takes effect--the rules for the others are ignored whilst there is a stronger locus in the unit"

If at any time, there are two or more, you pick the strongest, if two are tied you choose which is the strongest, once you have chosen the strongest, the others are ignored.

If the others are being ignored you can no longer choose them at any future point in time. The only way you "choose a strongest" again, is if you have a 3rd one join so you "have two or more" otherwise you would have to have one of the two, leave the unit, and then rejoin it.

I don't think that choosing which of two same-tier loci applies makes the chosen count as the strongest for the purpose of ignoring the non-strongest.

However in this case the "if" is used in the sense of "when" or "in a situation that" and so you are required to choose when that "if" becomes the case. You would not be able to choose which applies again while the same situation remains. Certainly there's no permission given to choose phase to phase or game turn to game turn.

I think that would be the case even if you added a third or subsequent same-tier loci to the same unit, as it says "two or more". You would have to have the unit reduced to containing only one loci and then having another join before being able to choose again.