Thornmail

Thornmail is an advanced item in League of Legends. Tanks benefit most from it, when the opposing team has high basic attack damage output. League of Legends calculates Thornmail's reflected damage before armor reduces the damage. This means you can reflect more damage than you ultimately take if you have at least 234 effective armor (i.e. after reductions and penetration). Thornmail deals magic damage, and so the target's magic resistance will reduce it.

Recipe

 * (300g)
 * (720g)
 * 1180g

Strategy

 * is best used to counter champions that mainly rely on basic attacks such as and.
 * is not valued as highly as the other two high armor items, and, because it protects only the wearer instead of the entire team.
 * It is still a cheap item to counter many champions and should be considered not only by tanks.

Trivia

 * It is one of the few items mentioned in The Proving Grounds tutorial.
 * Currently, this item offers the largest amount of armor, being slightly above 90 armor.