Talk:Kassadin/@comment-84.111.140.23-20120226210725/@comment-88.186.19.90-20120227173242

Stacking MR is important, because it nulifies enemy magpen:

If you are at 100 MR and the opponent has 30 magpen, you reduce by 41%, however, if you stack it up to 130, then you reduce 50% of their damage ---> you win 9%.

Withought enemy magpen, you stop 50% of damage at 100MR and 56% at 130 MR --->you win 6%.

Now in the case of kassadin, his health pool and overall base resistances are pretty shitty, so he needs an edge over other APs to be actually useful until he reaches level 6: that's what is passive is for. However, 15% is not that great in early game, where your HP pools turn around 450 HP meaning that your effective health from the passive becomes 510 HP and we have to take into account that his kit doesn't let him farm very safey meaning that you NEED that HP to avoid having to leave the lane to regen instead of farming. At mid-late game, it hardly makes a difference because unless you are building tanky, because opponents usually dish so much damage you will dies with or withought your passive.