Talk:Armor penetration/@comment-4625266-20111123145325/@comment-4073002-20111123151654

armor reduces physical damage taken by 1-(100/(100+armor value)). when you autoattack, you do your attack damage in physical damage to the target. if you have 100 ad and attack a target with 100 armor, you will do 50 damage, because 100 armor halves your damage. if you get 20 ad you will do 10 more damage, because the 20 added raw damage is halved by the 100 armor. if you get 20 armor pen instead of 20 ad, you will do 5.56 damage more because it penetrates 20 of the target's armor, reducing it to 80 before damage reduction on your 100 ad is calculated. i'm horrible at explaining math but i hope it helped D;