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The version of miasma of pestilence in the death guard codex is different from the chaos space marine codex in that the death guard version can only target death guard and the chaos space marine version targets nurgle heretic astartes. Does that make it a different psychic power and therefore you can cast each version in the same turn? If so that's a -2 to hit say Mortarion.

They have the same name, so I would say no.

Captyn_Bob has it: The limitation on stacking buffs is based on the name of the spell/buff, not its Keywords.

This information can be found within one of the Designer Commentaries, not the Rulebook itself.
I would quote the line, but I am getting 404 when I try to access the website... strange.

 JinxDragon wrote:
This information can be found within one of the Designer Commentaries, not the Rulebook itself.
I would quote the line, but I am getting 404 when I try to access the website... strange.

GW changed servers for the Community site. Working links can be found HERE.

Thanks, turned out it was in the Frequently Asked Question and is a little problematic:
Q: Lots of aura abilities say they grant an ability to nearby
units that are within range of any such models. Are the bonuses
cumulative (i.e. if I am within range of two models with
identical aura abilities, is the bonus doubled)?
A: Unless stated otherwise, no. The bonus for such an
ability applies once if any (i.e. one or more) of these
models are within range.

This still leaves it up to us to argue what an 'Identical Aura Abilities' actually is, I thought they had used 'same name' somewhere within....
I'm going to have to get the Death Guard Book now and actually do research, my advice would be to flick an question over to Game Workshop to see if the above still applies in this specific situation.


Why does Game Workshop refuse to embrace 'does not stack by default?'
It allows them far better control over the Values, and makes it easier to backwards-compatible new Modifiers....