Talk:Riven/@comment-25553136-20141025122709/@comment-23835547-20141031024841

Yes but if someone has 1000 hp and 50 armor they have 1500 effective health vs AD. If they have 1000 hp and 100 armor they have 2000 effective.

After 10 Armor pen the first has 1400 hp and the next one has 1900 hp. Now take the ratios of the damage in (1400/1500)=93.33% of their original health while the second has (1900/2000)=95% of their original health.

Essentially is that 1 armor pen does not decrease the enemys effective health by 1%. It Increases your current damage done to them by 1%.

If you deal 50 damage a hit vs someone with 50 armor you deal 33.33 damage a hit. 50 Damage vs 40 armor (10 Armor Pen) deals 35.71 damage a hit. A 2.38 damage difference.

If you deal 50 vs 100 armor you deal 25 damage while against 90 armor you deal 26.32 damage a hit. A 1.32 damage increase.