Talk:Magic Penetration/@comment-217.87.153.250-20100928085558/@comment-3067750-20100928115502

Simple Answer: Soraka

Her Starcall, at 20 stacks, is 160 Magic Resist Reduction. I believe RIOT has accounted for the entire -100/(-100+100) occurrence which results in a division of zero. In addition to the -101/(-101+100) occurrence in which you would (normally) begin to -heal- your target with your magic damage. However, its questionable due to the practice game i had.

When I went in to a practice game and got 20 stacks on a Mana Golem putting it at -180 Magic Resist, Starcall did no damage (I didnt try seeing if it healed mana golem though), but Infuse did. And looking at the Mana Golem's damage reduction from having -180 MR, it said that it had -66% Damage Reduction.