Magus should give 20 Magic Pen and 10% CDR to compete directly with Warrior

The 10% extra CDR it gives is nice but it doesn't allow them to deal any damage with less offensive items like Warrior allows

So now it gives 60-80 AP + 10% CDR + 20 Pen instead of 80 AP + 20% CDR

The Pen would not stack with Sorc Shoes as a unique interaction