Bone Plating sounds kinda weak/bad tbh
[New] Bone Plating (R2) After taking damage from an enemy champion, the next 3 spells or attacks you recieve from enemy deal 15-35 (+1% of your bonus health) less damage. Duration: 5s Cooldown: 45s
The best case scenario is that you stop 3x that value of damage in total, so 45-105 + 3% of your bonus health. At level 18 with 3000 bonus health you can stop up to 195 damage. On a 45s cooldown, with how conditional it actually is, that's a joke. If it was a guaranteed health shield instead it would still be weak imo.
I think what bothers me about this isn't actually the numbers, but I don't see the point to the mechanics of it. Flat damage reduction is bad against burst, good against DPS. But the limited number of blocks is bad against DPS. So it's actually just a janky unreliable health shield.