What if we had a stat to counter resistance-ignoring/penetration damage?
Hypothetically, what if we had a stat, like Critical Chance or CDR that was named Toughness, for example; a stat made to counter armor/magic penetration and true damage:
Effects that reduce or ignore armor and magic resistance such as true damage, armor and magic penetration have their efficiency decreased by the amount of Toughness the victim has, up to a maximum of 50%.
.
Aggressor has 50% total armor pen; deals 1000 physical damage and 1000 true damage.
Victim has 100 armor and 0% toughness; takes the 1000 damage with only half of its total armor (50) being considered in the calculation + 1000 true damage.
Victim now has 100 armor and 20% toughness; takes the 1000 damage with only 60% of its total armor (60) being considered in the calculation ( toughness reduced the armor pen by 20% ) + 1000 true damage, which 20% of it gets reduced by the victim's armor damage reduction ([800 + 200*(damage multiplier reduced by armor)] true damage.
ONLY tank items would give toughness: 
, etc. -> 10~20% toughness each
[Conqueror] them.
