How does "Increase armor piercing" stack?

Lets say I have ‘Increase armor piercing by 100%’ from blades of Nadeen and ‘Increase armor piercing by 35%’ from will of the blade, will they stack additively and be a 2.35 multiplier or multiplicatively and be 2.75 multiplier?

For example if my axe has base 20% armor pierce, will the final value be 47% or 54%?

Thanks!

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all “increased armor piercing” will add upp to a total multiplier (nadaad + will of blade = +100% + 35% = +135%)

in this case, you multiply weapon base armor piercing 20% by 2.35

I did not find an answer in that guide (I read the part on armor piercing there before I posted)

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Thanks! @malawiglenn

I think it is mentioned in the guide, but perhaps not clear enough. I will fix it soon.

Ok I added a few paragraphs in the guide, thanks for input!