Want to beat thornmail? HERE IT IS!
Well we all know how annoying thornmail can be, specially as an ADC or squishy AD champs, such as Riven. Some of you might not be aware of what thornmail does. What it does is it reflects 30% of the physical damage dealt by the attacker ( including most on-hit effects ). So the more AD you have the worst it will get. So it's pretty simple really, if you're being damaged by the damage you deal, you just simply want to get HEALTH BACK from the same damage you deal. Also keep in mind all the damage being returned by the evil thormail is magic based, so 1 or 2 simple magic resist items will do the trick.
Items that counter thornmail - 
for damage.
  for MR.
If you build those first 3 AD items and a banshee, you're basicly set, and that thornmail will be close to useless. Hope this was useful for anybody out there having trouble with those nasty thornmails, specially for Riven players... man those thornmails can really pack a punch.
to rush with.
