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I was looking at the leaked rules for the Myphetic Blight Crawler for the Death Guard codex from our News & Rumors post

https://www.dakkadakka.com/dakkaforum/posts/list/732375.page

the Putrescent Fog aura ability says "deathguard units within 7" gain the benefit of cover when making armour saves."

since the wording says they "gain" cover would that
1) extend a cover save to a unit that was in close combat?
2) improve the cover save of a unit already in cover?
3) only apply to units not in CC and not already in cover?

its 3. The rule doesn't state it alters the cover rule, just that the unit is in cover. And a rule doesn't stack with itself

The way I read it is:

1. It extends the benefits of cover. The benefit of cover in close combat is none, therefore Putrescent Fog does nothing for armour saves in close combat.
2. A unit cannot be in cover twice, so no additional benefit there.
3. It does extend to units in cover or in CC, it just doesn't double up with real cover, nor does it apply to armour saves against CC attacks. But if you state it does not apply to units in CC or already in cover, I think that would not be correct as sometimes you can be shot in CC (by pistols), and there it would apply as I read it,

If a unit is entirely on or within any terrain
feature, add 1 to its models’ saving throws
against shooting attacks to represent the
cover received from the terrain (invulnerable
saves are unaffected). Units gain no benefit
from cover in the Fight phase (pg 182)
- Terrain and Cover

There are two issues here;
1) The bonus if granted only to Shooting Attacks
2) Units gain no benefit from being in cover during the Fight Phase

Terry,
Can you assist me by at least giving me a page number for the 'the same named ability can not stack' clause?
Getting flashbacks to the 'the same named power from different casters are not the same power' debates of old too....

I do agree though; the fact the Authors stated the Unit gains the benefit of Cover instead of taking the easier path of stating +1 Armour Saves informs me they simply wanted to add the flag 'in cover' to the Unit. It is my belief that multiple versions of the same flag does nothing, but the issue always gets a little muddy when it comes to modifying characteristics and rolls. Game Workshop not only allows modifiers to stack by default, but have been very inconsistent in determining which modifiers count for 'stacking' even when they had a straight forward 'Powers can not stack' Restriction. What really stops people from being able to argue that the +1 Armor Save via 'Cover from Terrain' and the +1 Armour Save via 'Cover from Putrescent Fog' are cumulative? Just because I believe Cover is a flag switched between True/False doesn't mean everyone does.

Personally, I think Game Workshop should simply forbid modifiers from stacking at all but they have never wanted that easy solution....

P. 175 Modifying Characteristics "All modifiers are cumulative" but it does not say +2 to your save if in cover or +1 out in the open. (like the SM Scout cloak that gives +2 instead of +1) Instead it is more a 6" benefit of cover bonus +1 regardless if in terrain or outside of it.

It does benefit them in CC if in the shooting phase your opponent shoots pistols at you.