The new Thornmail is a testament to Riot's undying bias towards Marksmen

The item was reworked in the hopes of being able to mitigate ADC lifesteal, while also making the tank less attractive to swing at. It does neither of these, and here is why.

Thronmail's damge has been gutted. 100% gutted. 10% of your bonus armor plus 25 is NOTHING. What's the most armor you can even get? 300? 350? That's 60 damage per auto at the most. Okay, but an ADC auto can do upwards of 500 to 700 damage when crit is factor ed in. 15% (the old damage value applied to the attack's damage) of 700 is 105 damage per auto.

Here's the other problem. The Greivous wounds only matters when applied to the next autos after the first. So if this 700 damage auto is having let's say 35% life steal (Bloodthirster plus Death's dance), that means that they get healed for (if we assume you have 180 armor, which cuts all physical damage by 64%) 245 healing - 64% = 88.2. Now with Grevious Wounds, 40% of 88.2 = 52.92 total healing.

10% of 180 armor is 18, + 25 = 43 total damage from each auto. Thornmail not only mitigates nothing, but the ADC will eventually also get a last whisper item at some point, so by the time Thornmail FINALLY even just BEGINS to break even, ADCs will be healing for more due to all of the armor they ignore.

Thornmail is NOT worth the purchase unless the entire enemy team is AD.

At the end of they day, we should have been thankful for the old Thornmail