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**Eppa**:

Something to note is the closer you get to 0 the better each point of arpen is, so if you should compare them compare the sum of all arpen marks if you want to compare them with crit.

This isn't true. If you are looking at

* how many hits it take to kill a champion*, armor is linear.

Assuming all damage is physical, someone with 2000 health (pretty common) gains 20 effective health with each point of armor. It doesn't matter how much armor they have.

Let's say you hit for exactly 100 damage. Every 5 armor any 2000 health champion has forces you to hit that guy exactly one more time. It doesn't matter how much armor or armor pen you have (as long as you aren't reducing below 0!)

People seem to want to think about armor as percentages of health or something weird like that, but in terms of how much damage you need to dish out it's linear. i.e. if you have 100 armor and 2000 health, that's like 4000 health, so adding another 100 armor 'only' brings you to 6000 health -- instead of doubling your health, you've only added 50% more! But that makes no sense -- you are still adding exactly as much effective health.