Originally Posted by otirruborez
with 70 pen teemo build that person would still negate 56% of the damage.
with 364 ap, teemo shroom does 890 to 0 mr target. 392 damage after resists. 132 extra damage from bft and you get a total of 524.
a ton of damage, but not 1/3rd. barely half that. in fact that's 2 infinity edge crits on a 200 armor target.
Ok, I was making an off hand statement, and you want to do the math.
Fair Enough! lets do the math!
-downloads LoL Magic dmg excel sheet....
now for the figures: you missed void staff and the passive aura+offense tree for 49% addition penetration, and I run mpen runes for 81 total flat pen not 69.
thats just under 40% negated dmg... instead of 56
I get 554 dmg before BfT, After resists.
assuming 6 ticks of BfT on a 3000 hp tank, that's 300 more flat magic dmg, reduced by mr to 186.69... add that and we get 741 dmg, or about 25% of your hp so 1/4 not 1/6 as you suggested.
my bad I should have said 1/4 (I thought about it)
so, for a massive tank, in 1 ability that's 25% of your hp, and you might run over 2-3 of them on your way up top... at least you wont die like any squishy would?
also MR is more expensive, harder to itemize, and not supposed to scale exponentially (whereas auto-attacks require being in aa range, at significant threat of being cc'd)... your comparison to IE is worse apples to oranges
TL;DR its 1/4 of your health if you are a 200 MR 3000hp tank