Awareness

[Maelwys]

Enemy Autoattacks can Crit, their spells and abilities can't.
Awareness is actually worth using now whenever you're in danger of taking a big nasty hit of damage, and taking an unlucky autoattack hit at the same time might push you over your limit.
I tend to pop it alongside Bulwark, which is also "Chance based" mitigation.

Since you can't see when a Crit "Doesn't happen" you can't really tell when it's working, but its a little extra insurance for normalising incoming damage.