User blog comment:Lukeatlook/Pyro's Item Overhaul 9 - The Carry Project/@comment-25935337-20141229201105

In reference to the earlier comment about armour pen, I wraped the reduction and pen into one since there was no % pen or reduction involved. Zekes combined with entropy, totaling 40 armour mitigated, and when combined with runes mitigates a bit over 60, which is 2/3 of most champions base armour when at max level, so wanted to check that it was as intended.

Thanks for the clarification on the BotRK interaction. The numbers make a bit more sense now, but it does force people into crit based builds. Not that current itemisation does not, but if your not careful with how the unique passives are placed you would probably maintain the current situation where there is only a single optimal build.

On the LW front, the idea was that Hatchet+BC give you greater armour mitigation on crit building champions, which makes LW redundent on them, and so relegating LW to a bruiser/assassin item. It was only a quick estimation though