The "-40% Adrenaline Consumed by Shadow of Nyx Ability" legendary engraving that can be applied on legs is still bugged.

It shows in the Unique Modifiers section of the detailed stats but I can guarantee that it's not working.

Without the engraving, every bar of adrenaline lasts 7.5 seconds using tier three of the Shadow of Nyx ability. With the engraving applied, it's also 7.5 seconds.

It's sad because this bug has been around forever, here is a post from almost a year ago that detailed the same thing. Now we're on the latest patch and it's still not fixed!