lol "100 resistance is the most efficient" nope.jpg
each point of armor you have is 1% more effective health vs physical damage and MR is 1% more effective health vs magic damage meaning that if you have 500 armor and 3000 health you have an effective 18000 health when facing an all physical damage team before reduction and penetrations are applied.
alright so it is time for me to bring out the math on how it works
(100/(100+((armor-armor shred flat)(1- armor shred %))(1-Armor pen %)-flat armor pen)) damage that is the base for how damage is equated and the same system is for magic damge.
The top 100 is never changed by anything except for fpat % damage reduction like alistar ult reducing it to 30 from 100 etc.
Let us say that you have 100 armor the enemy has Last whisper, weapon expertise and 10 flat armor pen
This means that
100/((100+100(1 -.389)-10))
100/(100+100*.611-10)
100/151.1
66.2% physical damage taken when you have 100 armor
if you have 3000 health you now have an effictive 5287 health vs a fully built ADC
Now increase it to 300 armor
100/(100+300*.611-10)
100/(100+183.3-10
100/273.3)
36.6% of all physical damage is taken when you have 300
this mean that 3500 helath becomes an effective 9562 effective health vs a fully built ADC
Armor and MR do not get reduced effectiveness the more you get. They just have less damage to reduce making it seem like you are getting less if you are basing it on the % of damage you are taking.
Now if you were to complain about true damage that is a different story and the only counter to most of it is more health except for vayne with 8% true damage every 3 consecutive hits.