Got two questions right now:

1. Natural Armor, does it stack with 'normal' armour?

2. Daemonic presence, does it stack with another Daemonic Presence? Say if we're fighting three Ebon Geist, is the penalty -30 or -10?

Actually I also have other questions on 'Stacking', but maybe later.

Thanks in advance

1. My understanding is that it does. Trait / Bionic armor stacks with worn.

2. Highest would take effect only. Otherwise a few demons could make rolls impossible.

Armour from multiple sources doesn't stack, per RT corebook page 137, so no, Natural Armour doesn't stack with normal armour. The only ones that don't fall under this is the Machine Trait and any bionics that add armour, as that has been changed by the devs.

I would likewise say no to the stacking of Daemonic Presence.

In the Machine-Trait thread, Khorne-Ucopia has just quoted Mack who said that Natural Armour, like Machine, does stack - which is IMO a rather sensible answer. The obvious sillyness is several suits of armour being worn, which is why that explicitly does not result in more AP. However, if some Xeno semi-beastie wears a quilted vest over its fur, that should IMO have an effect, just like if it happens to be taking cover behind a wall.

Ahh, that's been changed now? It was just Machine traits that stacked originally.

Fair enough then

Cifer said:

Logically speaking there is nothing more silly about allowing people to wear two different kinds of armour and have the AP's stack then there is about letting people flak armour under there skin and have that stack with whatever they're wearing above. It is exactly the same thing that you're doing, just in one example there's skin in between and in the other there's not. Personally i do not get the stance the dev's are taking on this at all. The whole idea about armour is that the thicker it get's the more it'll stop. If you're taking cover your opponent first has to blast through the cover, then through your armour before his bullets hit you. Hence why it stacks. The same applies equally to if you're wearing two sets of armour: after the bullet get's through the first, it'll still have to get through the second, nothing changes except the two are much closer together.

There's a much more logical consequence you could give for wearing armours on top of each other and that's to reduce the agility you have and your ability to dodge. Maybe also increase the size level one step (from normal to hulking) since you are wearing two suits of armour on top of eachother. Personally that's how i'd resolve it, with the possible exception of a synskin which seems to be designed to be a second skin with some AP's. Compared to the Subskin Armour i described above synskin would be far less a problem to wear under normal armour.

I'd like to share something, but sInce I found difficulties in pasting my mail from Sam Steward (FFG Rules), I'd just rewrite them here:

1. Do Machine traits and Armour stacks, such as at the Battle Servitor charon pattern?

---Yes

2. Do Natural Armour and Armour stacks, such as a mutant with natural armour wearing flak armour?

---No

3. Do Machine traits, Natural Armour, and Armour stack?

---Machine and Armour would stack, and Natural armour and Machine would stack, but not all three together. Basically Machine breaks the "no stacking" rule specifically