Talk:Vel'Koz/@comment-27083241-20151212093854/@comment-27004415-20151212201201

The magic penetration is better for two main reasons: First vel'koz has 4 damaging abilities. Second if you look at what you get from both masteries and compare it to runes, you would need more rune slots to obtain the equivalent of magic pen you get from the mastery (let's imagine lvl 6) than the amount of rune slots you need to achieve 5% cdr.

A third reason is that you should always prefer what gives you power early on, even for scaling champions. Because if you have to fight at lvl 3, you want to fight with maximum power. That's the same logic regarding thunderlord's decree vs death fire touch.