Where do you get this kind of an outfit?

I have seen a few people walking around with this kind of hulking armor/outfit.
Where do you get this kind of thing?
I have Guild Wars: Prophicies and Eye of the North.

http://tinypic.com/view.php?pic=akfocl&s=4

Its a Autonmatonic from the zaishen chest, http://guildwars.wikia.com/wiki/Automatonic

actually its not the automatonic from the zchest.
that specific one is from the mox quests. you use a sinister automatonic.
theres a difference.