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you need to go to this dude http://www.wowhead.com/npc=36669/arcanist-tybalin just got to DB tower and retake quest and go and speak with this dude, and you cant have horde bettered hilt its just...

that npc you need to talk is on alliance side it only shows in quest helper that it is on horde side, http://www.wowhead.com/quest=20438/a-suitable-disguise here it is and if you would spent 3 mins...