Since the description refers to "defensive opennings" [sic], I'm assuming this is part of the enhanced melee skills that are still under development. If you look at the Lucy description (as of today), you'll note that it shows only the Test Server version, and the link for the Live version doesn't work.
It's been quite a while (maybe over a year?) since the melee enhancements were first mentioned by the devs; maybe someday they'll decide they're ready to go live.