How does Wu's armor pen work
At max level crushing blow reduces 30% armor. 6 autos on Black Cleaver also reduces 30% armor (these stacks can also be applied in Wu's ulti). Last whisper flatly ignores 35% armor.
So is it additive? Does having those 2 items mean that a Q Ulti will mean you are hitting them for as if they only had 5% of their armor?