Of all Marksmen, Koggy is uniquely vulnerable to Thornmail

{quoted}

well, depending upon if his lifesteal doesn't overcome it...as most does

I really don't like the argument that LS is the counter build to thornmail. Mostly in the sense that LS is post armor. The more armor the enemy has, the less effective LS is going to be in general. I recall the better counter to Thornmail is wit's end because the magic damage passes right though the thornmail, and the MR helps against the return damage. (though Wit's end is too far from what ADC's want that they simply can't build it.)

Also, The key life steal item for Kog (BotRK) got nerfed this patch. So it's not quite as effective as it use to be. (though Kog should still be able to use it to great effect. )