This is tradeable on Firiona Vie server, server transfers are still free to FV and I am looking to buy there currently for 4 million platinum. Contact me at SOE.EQ.firiona.Vegus to set up a meeting time or just to inquire any further details.
sometimes on the sony forums they hold forum challenges, and rarely those challenges will offer an illusion item as a prize. there is a list of chooseable prizes which includes this mask. this is the only way to obtain the item if you don't already have one.
I won one such challenge once, but I already had this item so I picked a mask of the devious. all/all gnome mask oh yeah!
the most recent challenge to offer illusions was the mr and mrs norrath 2009 contest. before that it was the halloween 08 challenges, and before those was a challenge last may which resulted in the "eye on norrath" section of eqplayers.
It's "obtain" not "abtain" and the zone is Devastation, for crying out loud. My English teacher would tear her hair out if she ever played this game O.o