Talk:Rabadon's Deathcap/@comment-173.62.189.178-20110711210944/@comment-24.21.216.199-20111111210633

It's worth pointing out that 30% AP is not the same as 30 magic pen. If I gain 30 magic pen against the champion who has mythically 1,000 MR, I gain essentially nothing as magic resistance is inversely and exponentially related to damage taken (i.e. the more of it you have the less that last 30 MR matters), while if I gain 30 magic pen against someone with exactly 30 MR, I am reducing their resistance by 100%. The +30% AP is the same value of base damage whether I'm doing 1% damage or 100% damage to the target.