I haven't been able to find a recent post about this to know if it is true for the current patch, but do the armor pen passives on
and 
stack or cancel each other out? I'm just a bit confused because they are different amounts but the same type of passive.
Thanks
Buy them both and see how it effects your stats. I use these both sometimes at the same time, and believe they stack off the number before either is applied for each. One is not applied after the other. But, I'm not 100% sure.
They stack. BC removes enemy armor, ghostblade has the active. The UNIQUE part of the passive that gives APen just means you cant get it from more than one of the same item, but the rest of the non-unique stats will stack if you do.
