Originally Posted by Agg
i think % penetration is capped at 50%, regarding that dual % pen item stacking with the other % pen items. i could be wrong? don't remember where i heard that cap.
WTB caster item with a ward use, caster item with a heal debuff use (same passive as exec calling), ap/spell vamp item (soulthirster or something).
I remember hearing that too, can't remember who said it though.
With the offensive mastery Archaic Knowledge and a Void Staff, you're sitting at 49% MR penetration (I remember that same post mentioning percentage penetration is multiplicative, not additive). This means that there's really no more room for percentage-based MR penetration.