Talk:Armor penetration/@comment-112.208.79.16-20120729085029/@comment-5068327-20120729092917

Armor penetration is for all physical-based skills, but it can't be increased by using those skills.

For example, Vayne E deals physical dmg, with 10 armor penetration she will, well, ignore 10 armor from the opponent. Her Q deals 50% bonus physical dmg, but will not increase the armor penetration, only the physical damage that she has.