I was bored, so I came up with a thing. Tl;dr shields shields shields
Lets have some fun with theory crafting
Armor: Physical damage mitigation >> Physical damage shield equal to armor that absorbs 70% of incoming physical damage until broken. Restored upon revival effects or visiting the fountain.
Magic resist: Magic damage mitigation >> Magic damage shield equal to magic resist which absorbs 70% of incoming magic damage until broken. Shield regenerates at a rate of 5% per second.
Armor pen: Ignore a flat amount/percentage of targets armor >> Increase the amount of damage that goes through the armor shield.
Flat causes individual attacks to have an amount equal to your flat armor pen to pass through the shield uninhibited, % lowers the mitigation value.
Magic pen: Ignore a flat amount/percentage of targets magic resist >> Increase the amount of damage that goes through the magic shield. Flat causes individual attacks to have an amount equal to your flat magic pen to pass through the magic shield shield uninhibited, % lowers the mitigation value.
Items/Abilities that grant armor and magic resist have their numbers raised significantly to deal with the new system. Abilities scaling off of armor/magic resist have their ratios lowered to prevent 
from building 
and hitting 900 AP.
If this were to happen, what would the game look like?
