L90 transmog vendor in Shrine of 2 Moons
The gear he sells is not drop based, it is not rep-based, it is purely based on obtaining a Gold Medal via accomplishing challenge-mode dungeons under the set time (Well, the time limit set by blizzard to achieve Gold). The gear is otherwise unobtainable.
You must not only get Gold, you must complete every challenge mode with with Gold.
See here: http://www.wowhead.com/achievement=6378
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