Talk:Armor/@comment-24.118.110.197-20130201075214/@comment-67.49.84.33-20130225013328

"You are not "doubling" the amount of armor *added* when you increase from 0 to 100, as when you increase from 100 to 200. Both times you are increased your armor by 100 and both times you are making yourself take 1 more "hit" to kill:"

Actually, it does diminish, and your example proves it. The first 100 points of armor takes the hero from 10 "hits" to 20 "hits". His survivability has doubled. The 2nd 100 armor takes him from 20 "hits" to 30. That's a 50% increase rather than the 100% provided by the first buff. If the enemy were to simultaneously double his damage output to 200, you would suddenly only be able to take 15 hits, because his extra 100 damage would have more of an effect than your extra 100 armor, due to diminishing returns.

An easy way to think about it: add 100 points of "hidden armor" to the value shown in your stats. Thus going from 0 to 100 armor doubles your survivability (because with "hidden armor" you actually went from 100 --> 200) and so on.