Talk:Void Staff/@comment-25122281-20151115205205/@comment-25122281-20160103201719

Ok, I have come to conclusion, that indeed buying magic pen on top of AP is always useful. However, I forgot that if the enemy has e.g. 40MR, then a better source of magic penetration is Liandry's Torment, Abyssal Scepter or Sorcerer's Shoes. So you don't always have to invest in Void Staff that only gives AP and magic pen, when there are items that give other stats as well.

As far as the old Last Whisper is concerned, that wasn't the case, because it gave the most armor pen by the end of the game, since every champion gains armor per level.