Talk:Magic Penetration/@comment-94.68.239.75-20101218205124/@comment-182.55.236.10-20110703201546

basically "penetrates" your target's Magic Resistance stat, thereby increasing your magic damage.

in general, more magic penetration = more magic damage.

do note that magic damage is different from physical damage. magic penetration won't help auto attacks or abilities which deal physical dmg.