Why hasn't magic pen given the lethality treatment yet?
Lethality is less effective early game to reduce ad assassin snowballing, but magic pen works the same at all levels, meaning a mage can remove 33 mr with 2.7k gold.
2 Comments
Because MR doesn't scale as hard as Armor does.
A high base armor champion essentially negates Lethality more as the later stages, but many champions don't scale in MR at all outside of items, including the majority of MPen buyers. So either they reduced its effectiveness early making it entirely worthless or it scales later, making it completely overpowered and mandatory
Base MR scales up differently with levels than base armor.