User blog:Krufix/Armor/Magic pen is anti health stacking.

If someone were to ask you what does a damaging champion do to kill health stacking champions like Mundo, Vladimir or Singed, how would you answer?

Ether build or, most people would say. After all, they both have passives which work on enemy health.

However something happened to me in game reciently which made me think of a different way of looking at the scenario.

Health as I'm sure you know is a stat which is effectively boosted by a person's armor and magic resistance. Every point of armor increases a person's health by 1%. Someone with 2000hp and 50 armor must take 3000 physical damage total to be killed.

To someone with 2000 hp, a for 720g is as good as 2  for 2000g. A Chain Vest grants 800 extra HP to physical damage.

To someone with 3000 hp like a Vladimir or Sion, a is better than a. A Chain Vest grants an extra 1200 HP to physical damage.

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Thus imagine if you're attacking someone and you're armed with a trusty. Their 40 armor from the Chain vest is actually 30 now. To someone with 2000hp, your brutalizer has robbed them of 200 HP. To someone with 3000hp, it has robbed them of 300 HP, etc.

Armor/Magic penetration, doesn't just counter people who have stacked Armor or MR, it also counters people who have stacked health too.

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Just to clarify, the choice between / or / is exactly the same, someone who's stacking resistences would be better off with percent penetration, if they aren't then it's better to get flat pen.

However to also clarify the point. A level 18 Mundo with no items or runes has 80 armor and 52 magic resistence and 2035 health.

As the customary Bronze Mundo build of 5 Warmogs and a Phantom Dancer, Mundo has 80 armor, 52 MR and 7035 health. Effectively 12663 HP to physical damage or 10693 HP to magic damage.

Against a Last Whisper, Mundo has only 52 armor. Lowring his effective health by just over 2000 to physical damage.

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So next time you're facing an annoying Singed who never seems to die even though all he's building is glass cannon + Rylai's, keep your options open. Maybe you don't need to buy a BotRK just to deal with him, and then get screwed by the armor stacking Malphite, and you should go for Last Whisper instead and deal with both of them.