From WoWWiki
The Traders' Tier is the area of the Exodar containing most of the trainers and vendors. This area houses various non-magic craftsmen and merchants, and also the Guild Master and tabard seller. Scattered around the floor are engineering, mining, blacksmith, skinning, leatherworking and tailoring trainers, as well as Dugiru the Alliance Cloth Quartermaster. Slightly up the stairs is the Hunter's Sanctum, with hunter trainers, and at the top of the ramp is a circular platform called the Ring of Arms with warrior trainers and Handiir the weapon master.
