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**sanjiluv**:

Im not exactly sure how this works in LOL. But in dota and HoN you can actually go below 0 armor giving bonus damage

for example if you dropped to -5 armor you'd take a bonus 10% damage. (past having 0% reduction on the normal attack. so normal attack +10% of that attack.)

clarify anyone?

This is true in LoL, but not with Armor Penetration, only with Armor Reduction. If you reduce a target's armor to the negatives, they take extra damage equal to the percentage that that much positive armor would reduce your damage by.

So for example, 50 armor reduces damage by 33%, so -50 armor increases damage by 33%. This is very difficult to accomplish without the use of abilities, however, as there are only two items that provide armor reduction - Stark's Fervor (20) and Black Cleaver (12 per stack for a total of 60). Most champions innately get up to 70-80 armor simply by leveling, so unless you have another ability that reduces armor, you're not going to get it much below -10.

Hypothetically, the lowest you could get someone's armor would be:

- 20 (starks) - 60 (BC) - 50 (Corki Gatling) - 40 (Nasus Spirit Fire) - 26 (Eve Ravage) - 30 (Taric Shatter) - 35 (Karthus Wall of Pain) = -261, off of someone's minimum base armor of I believe 7 = -254, for a 71.75% increase in damage (of course, since they'd be level one this would probably instagib them just putting all those debuffs on them)

Edit:

Also, Lawful, you are way off. Waaaay off. Penetrates 40% of the target's armor. It really can't be any clearer. Armor * .4 = the amount of armor penetrated. If you want to do this with a division to get the ending armor, you'd start by taking .6 (what the armor remains at) and then take the reciprocal of that, which is 1.667. So yeah, 80/1.667 = ~48, which is 32 penetration, which is 40% of the starting armor penetrated.

Seriously, learn to math. I'll go and test this in a practice game to show you if you're going to be stubborn on this.