Talk:Magic penetration/@comment-91.183.32.144-20120509074110/@comment-85.201.176.117-20120510133433

It is true that the armor and arpen becomes less and less effective relative to itself. But the cost-effectiveness is still the same, i mean, lets consider the case where you have 1000 hp, 100 armor. That means that your effective health is equal to 2k. If i get 20 arpen, u will only have 80 armor, and so, 1k8 effective health, so a "gain" of 200 effective hp for 20 arpen (a relative loss of 10%).

Then lets consider the case where u still have 1k hp, but now, 200 armor (so, 3k effective health). Again, 20 arpen will mean that u have 180 armor, so 2k8 effective health. And so, the gain of 20 arpen is still the same, i.e. 200 hp. Ofc, the relative loss is now only 6.6%, but this has nothing to do with the cost-effectiveness of an item, does it?

I guess I am wrong somewhere, but where?