Why is Thornmail designed to be better in early-mid game compared to late?
League of Legends Match History
Playing as jungle Trundle, Rengar gets ahead early (and he's an asshole about it), so I get Thornmail after 
and 
. Even though Trundle's not an armor tank, the Thornmail without a health item still lets me kick that Rengar's ass.
Compare that to a past match I once had where I was Leona, I could have up to 500+ armor, but the Thornmail doesn't even make my enemies flinch.
What the crap?
I feel like Thornmail's not doing its job once a player stacks up armor in late-game, likely due to enemies getting MR, LS, and items like 
and/or 
(which also mitigate the effects of Thornmail). It just sucks the later and later a match gets.
Intentional design?
