Quote:
Originally Posted by Game Mechanics
Armor Penetration
Armor Penetration is incredibly straightforward - it simply allows you to ignore the listed percentage of the target's total defense. If a given attack has 10% armor penetration and the target has an armor level of 100, he will only have an armor rating of 90 for the purposes of defending against this attack. Thus the armor penetration equation:
[Armor Rating] = [Armor Level] × (1 - [Armor Penetration] / 100)
To give you an idea of how this works, here's a piece of the armor effectiveness table, adjusted for various levels of Armor Penetration:
Effect of Armor PenetrationArmor Level 0% Penetration 5% Penetration 10% Penetration 25% Penetration 50% Penetration
40 141% 146% 152% 168% 200%
50 119% 124% 130% 148% 183%
60 100% 105% 111% 130% 168%
70 84.1% 89.3% 94.9% 114% 154%
80 70.7% 75.8% 81.2% 100% 141%
90 59.5% 64.3% 69.5% 87.8% 130%
100 50% 54.5% 59.5% 77.1% 119%
So while our 30 damage attack from the previous examples dealt a paltry 11.6 damage to a well-defended Warrior, that same attack with 50% armor penetration would deal:
30 × 2(( 60 - (80 + 20 + 15) × (1 - (50 / 100)) ) / 40) = 31.3 damage
An attack with 50% armor penetration cuts through Knight's Armor as though it were nothing more than Master's Robes. If you're having trouble taking down a target with an exceptional armor rating, attacks with armor penetration are exactly what you're looking for.
Answer on armor penatration.