Originally Posted by Achilles
You can't. My take is that the devs wanted to have some sort of DS equivalent to the Circlet of Saresh (Tulak Horde's mask is not it) so they made this and placed it in such a way that you could only get it if you went to the Dark Side (instead of making it with an alignment restriction)
I think it is more to emulate the cut-scene Revan's mask. Although a poor substitute.