Thornmail

Thornmail is an advanced item in League of Legends. It is best obtained on tanks when the other team has high physical damage output. Damage returned by Thornmail is calculated before the damage reduction from armor. This means you can be taking less damage than Thornmail is returning. The damage dealt by Thornmail is magical, and as such will be reduced by the target magic resistance.

Recipe

 * (300g)
 * (700g)
 * 1000g

Trivia

 * It is one of the few items mentioned in The Proving Grounds tutorial.
 * Currently, This item offers the largest amount of armor.