http://screencast.com/t/IpPCcITPvAQG
Shows up in the tooltip for me. Hmm... there must be some cases where it isn't being displayed. Im not sure what the difference is.
I also dont have the tech researched which unlocks chain mail (though i tried with that research too). In either case I saw the trait warning.
Derek, thanks for replying!
Is it possible having a hero with that trait proficiency could cause the requirement to appear? For instance, maybe having a Defender hero who starts with Chain would cause it to appear. Or could it be related to the faction you're using?
In my game above, I started the awesome new scenario you made and got the chain mail from killing the Fire shrill. Should be easy to replicate.