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

It's a tonic that transforms you into a golem. It's called a Sinister Automatonic, you receive 10 of them for completing all the M.O.X. quests that require all 3 games. You can probably find somebody to buy a few off of.

i think this may help ya as well.
http://guildwars.wikia.com/wiki/Automatonic

Edit: We apologize for the confusion.

Zaishen chest GOLEM tonic has a green-ish chest, Sinister Automatonics have a red chest (same as the picture) and are given for completing Zinn's Task.

http://wiki.guildwars.com/wiki/Sinister_automatonic
http://wiki.guildwars.com/wiki/Sinister_Golem_Form
http://wiki.guildwars.com/wiki/Zinn%27s_Task

Second edit: forgiven

zlegadissan is right, I have 7 of them on my warrior, and iI'll happily give you one if you want to try it out for yourself =)

So there are ones with diff colored chests too? O_O
Well OP your question has been answered lol. Try farming balthazar points and opening a z chest...you can trade the new tonic for an automatonic if you want...