What's better for Quintessence: Flat +4.95 Ability Power or +2.01 Magic Penetration ?
Title. I play as mage Zilean support. Wondering if I should keep AP runes or get Magic pen runes. There is a "Greater Quintessence of Precision" (+2.24 Lethality /+1.40 Magic Penetration). How does Lethality correlates with Magic Penetration or Ability Power ?