New Thornmail on PBE

This version builds out of a new item, called Bramble Vest.

Bramble Vest Builds into Thornmail. Total Cost: 900g. Recipe: [Cloth Armor + Cloth Armor + G] Stats & Effects: +35 Armor. Unique Passive - Thorns: Upon being hit by a basic attack, reflects 25 magic damage, inflicting Grievous Wounds on the attacker for 1 second.

And Thornmail is being made more 'core'. It's build path has changed, and now it also has Health.

Thornmail Total cost 2900g Builds out of [Bramble Vest + Ruby Crystal + Warden's Mail + G] Stats & Effects: +250 Health +75 Armor Unique Passive - Thorns: Upon being hit by a basic attack, reflects magic damage equal to 10% of your bonus armor plus 25, inflicting Grievous Wounds on the attacker for 1 second. Unique Passive - Cold Steel: When hit by basic attacks, reduce attacker's attack speed by 15% for 1 second.

http://www.surrenderat20.net/2017/06/628-pbe-update.html

Thoughts? I'm worried it'll compete too much with Randuin's Omen, since they both sport the Cold Steel passive. I'd imagine that Tanks would just build whichever of the two is stronger at the time, although, having Grievous Wounds makes Thornmail a pretty tempting buy.